HomeMy WebLinkAboutChapter 27 Flood Plain ManagementCHAPTER 27
FLOODPLAIN MANAGEMENT
Article 1. Authorization.
Section 27-1. Statutory authority.
Section 27-2. Findings of fact.
Section 27-3. Purpose.
Section 27-4. Scope and methods.
Article 2. General Provisions.
Section 27-5. Applicability.
Section 27-6. Basis.
Section 27-7. Compliance.
Section 27-8. Other laws and regulations.
Section 27-9. Interpretation.
Section 27-10. Warning and disclaimer of' liability.
Section 27-11. Severability.
Section 27-12. Definitions.
Section 27-13. Nonconforming structures.
Section 27-14.
Section 27-15.
Section 27-16.
Section 27-17.
Section 27-18.
Section 27-19.
Section 27-20.
Section 27-21.
Section 27-22.
Section 27-23.
Section 27-24.
Section 27-25.
Section 27-26.
Article 3. Administration.
Director of public works approval.
Designation of the floodplain administrator.
Duties and responsibilities of the floodplain administrator.
Article 4. Standards.
Certification standards.
Standards for construction.
Standards for utilities.
Standards for subdivisions and other developments.
Standards for manufactured homes.
Standards for floodways.
Standards for coastal high hazard areas.
Standards for general floodplain.
Standards for improvements adjacent to drainage facilities.
Storm drainage standards.
i
Article 5. Variances and Appeals.
Section 27-27. Criteria for variances.
Section 27-28. Application for variance.
Section 27-29. Review of variance applications.
Section 27-30. Recording and reporting of variances.
Section 27-31. Appeals.
Section 27-32.
Section 27-33.
Section 27-34.
Section 27-35.
Section 27-36.
Section 27-37.
Section 27-38.
Article 6. Enforcement.
Right to enter.
Notice of violation.
Administrative order.
Injunctive relief.
Criminal enforcement.
Removal of encroachment and/or obstruction notices.
Removal by County; costs.
FLOODPLAIN MANAGEMENT § 27-1
CHAPTER 27
FLOODPLAIN MANAGEMENT
Article 1. Authorization.
Section 27-1. Statutory authority.
This chapter is enacted pursuant to the U.S. National Flood Insurance Act of 1968
(Public Laws 90-418 and 91-152), as amended, and the U.S. Flood Disaster Protection
Act of 1973 (Public Law 93-234), as amended. In addition, the Legislature of the State of
Hawai`i has in Hawai`i Revised Statutes 46-1.5(5), 46-1.5(14), 46-11, 46-11.5, and 46-12
conferred upon the various counties the authority to adopt regulations designed to
promote the public health, safety, and general welfare of its citizenry
(1993, ord 93-78, sec 3; am 2007, ord 07-169, sec 3.)
Section 27-2. Findings of fact.
(a) The flood hazard areas of the County of Hawaii are subject to periodic inundation
which results in loss of life and property, health and safety hazards, disruption of
commerce and governmental services, extraordinary public expenditures for flood
protection and relief, and impairment of the tax base, all of which adversely affect
the public health, safety and general welfare.
(b) These flood losses are caused by the cumulative effect of obstructions in areas of
special flood hazards which increase flood heights and velocities and, when
inadequately anchored, cause damage to uses in other areas. Uses that are
inadequately floodproofed, elevated, or otherwise protected from flood damage also
contribute to the flood loss.
(1993, ord 93-78, sec 3.)
Section 27-3. Purpose.
It is the purpose of this chapter to promote the public health, safety, and general
welfare, and to minimize public and private losses due to flood conditions in specific
areas by provisions designed:
(a)
(b)
(c)
(d)
(e)
(f)
To protect human life and health;
To minimize expenditure of public money for costly flood control projects;
To minimize the need for rescue and relief efforts associated with flooding and
generally undertaken at the expense of the general public;
To minimize prolonged business interruptions;
To minimize damage to public facilities and utilities such as water and gas mains,
electric, telephone and sewer lines, streets and bridges located in areas of special
flood hazard;
To help maintain a stable tax base by providing for the sound use and development
of areas of special flood hazard so as to minimize future flood blight areas;
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§ 27-3 HAWAI`I COUNTY CODE
(g) To assist in notifying potential buyers that property is in an area of special flood
hazard; and
(h) To ensure that those who occupy areas of special flood hazard assume responsibility
for their actions.
(1993, ord 93-78, sec 3.)
Section 27-4. Scope and methods.
In order to accomplish its purposes, this chapter includes methods and provisions
for:
(a) Restricting or prohibiting uses which are dangerous to health, safety, and property
due to water or erosion hazards, or which result in damaging increases in erosion or
flood heights or velocities;
(b) Requiring that uses vulnerable to floods, including facilities which serve such uses,
be protected against flood damage at the time of initial construction;
(c) Controlling the alteration of natural floodplains, stream channels, and natural
protective barriers, which help accommodate or channel flood waters;
(d) Controlling fill, grading, dredging, and other development which may increase flood
damage; and
(e) Preventing or regulating the construction of flood barriers which will unnaturally
divert flood waters or which may increase flood hazards in other areas.
(1993, ord 93-78, sec 3.)
Article 2. General Provisions.
Section 27-5. Applicability.
This chapter shall apply to all areas of special flood hazards identified by the
Federal Emergency Management Agency in a scientific and engineering report entitled
"Flood Insurance Study," dated April 2, 2004, with accompanying Flood Insurance Rate
Maps and all future changes, revisions and amendments to these documents, and shall
apply to all areas bordering identified special flood hazard areas, and all other areas
outside the identified special flood hazard areas encompassing and adjacent to a river,
stream, stormwater channel, outfall area, or other inland water or drainage facility
determined by the director of public works to be subject to flood hazards. The special
flood hazard areas are as follows:
(1) Floodway fringe - Zones AE, AH, and AO.
(2) Floodway.
(3) Coastal high hazard (tsunami) - Zones V and VE.
(4) General floodplain - Zone A.
(5) Land adjacent to drainage facilities, and Zone A99.
(1993, ord 93-78, sec 3; am 2001, ord 01-108, sec 1; am 2007, ord 07-169, sec 4; am 2017,
ord 17-56, sec 4.)
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FLOODPLAIN MANAGEMENT § 27-6
Section 27-6. Basis.
The areas of special flood hazard identified by the Federal Emergency Management
Agency in the Flood Insurance Study dated April 2, 2004, along with all subsequent
revisions and amendments, and the Flood Insurance Rate Maps, dated April 2, 2004,
May 16, 1994, July 16, 1990, and September 16, 1988, and all future changes, revisions,
and amendments to these documents, are hereby adopted and declared to be a part of
this chapter. The Flood Insurance Study and Flood Insurance Rate Maps, and all future
changes, revisions, and amendments to these documents, are on file at the Aupuni
Center, Department of Public Works, 101 Pauahi Street, Suite 7, Hilo, Hawaii 96720.
(1993, ord 93-78, sec 3; am 1994, ord 94-74, sec 3; am 1995, ord 95-86, sec 3; am 2007,
ord 07-169, sec 5.)
Section 27-7. Compliance.
No structure or land shall hereafter be constructed, located, extended, converted, or
altered without full compliance with the terms of this chapter and other applicable
regulations. The terms of this chapter shall be enforced by the standards set forth in
article 6.
(1993, ord 93-78, sec 3.)
Section 27-8. Other laws and regulations.
All construction and improvements subject to this chapter shall comply with other
applicable laws and regulations including, but not limited to, the zoning, building,
electricity, plumbing, subdivision, erosion and sedimentation control chapters of the
Hawaii County Code, and the storm drainage standards, October 1970 edition, or later
revisions, of the County of Hawaii. This chapter, designed to reduce flood losses, shall
take precedence over any less restrictive, conflicting laws, ordinances, and regulations.
This chapter is not intended to repeal, abrogate, or impair any existing easements,
covenants, or deed restrictions. However, where this chapter and another chapter,
easement, covenant, or deed restriction conflict or overlap, whichever imposes the more
stringent restrictions shall prevail.
In the event of a conflict between this chapter and the National Flood Insurance
Program and Related Regulations (NFIP), as amended, the more restrictive provision
will govern.
(1993, ord 93-78, sec 3; am 2007, ord 07-169, sec 6.)
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§ 27-9 HAWAII COUNTY CODE
Section 27-9. Interpretation.
In the interpretation and application of this chapter, all provisions shall be:
(a) Considered as minimum requirements;
(b) Liberally construed in favor of the County of Hawai`i; and
(c) Deemed neither to limit nor repeal any other powers granted to the County of
Hawai`i under State of Hawaii statutes.
(1993, ord 93-78, sec 3.)
Section 27-10. Warning and disclaimer of liability.
The degree of flood protection required by this chapter is considered reasonable for
regulatory purposes and is based on scientific and engineering considerations. Larger
floods can and will occur on rare occasions. Flood heights may be increased by man-
made or natural causes. This chapter does not imply that land outside the areas of
special flood hazards and areas of flood -related erosion hazards, or uses permitted
within such areas will be free from flooding or flood damages. This chapter shall not
create liability on the part of the County of Hawaii, any officer or employee thereof, or
the Federal Insurance Administration, Federal Emergency Management Agency, for
any flood damages that result from reliance on this chapter or any administrative
decision lawfully made thereunder.
(1993, ord 93-78, sec 3.)
Section 27-11. Severability.
This chapter and the various parts thereof are hereby declared to be severable.
Should any section of this chapter be declared by the courts to be unconstitutional or
invalid, such decision shall not affect the validity of the chapter as a whole, or any
portion thereof other than the section so declared to be unconstitutional or invalid.
(1993, ord 93-78, sec 3.)
Section 27-12. Definitions.
Unless specifically defined below, words or phrases used in this chapter shall be
interpreted so as to give them the meaning they have in common usage and to give this
chapter its most reasonable application.
"Accessory use" means a use which is incidental and subordinate to the principal
use of the parcel of land on which it is located.
"Appeal" means a request for a review of the floodplain administrator's
interpretation of any provision of this chapter or denial of a request for a variance.
"Area of shallow flooding" means a designated AO or AH zone on the Flood
Insurance Rate Map (FIRM). The base flood depths range from one to three feet; a
clearly defined channel does not exist; the path of flooding is unpredictable and
indeterminate; and velocity flow may be evident. Such flooding is characterized by
ponding or sheet flow.
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FLOODPLAIN MANAGEMENT § 27-12
"Backfill" means the placement of fill material within a specified depression, hole or
excavation pit below the surrounding adjacent ground level as a means of improving
floodwater conveyance or to restore the land to the natural contours existing prior to
excavation.
"Base flood" means the flood having a one percent chance of being equaled or
exceeded in any given year (also called the "one -hundred -year flood").
"Base flood elevation" means the water surface elevation of the base flood.
"Basement" means any area of the building having its floor subgrade (below ground
level) on all sides.
"Breakaway walls" are any type of walls, whether solid or lattice, and whether
constructed of concrete, masonry, wood, metal, plastic or any other suitable building
material which is not part of the structural support of the building and which is
designed to break away under abnormally high tides or wave action without causing
any damage to the structural integrity of the building on which they are used or any
buildings to which they might be carried by floodwaters. A breakaway wall shall have a
safe design loading resistance of not less than ten and no more than twenty pounds per
square foot. Use of breakaway walls must be certified by a licensed structural engineer
or architect and shall meet the following conditions:
(1) Breakaway wall collapse shall result from a water load less than that which
would occur during the base flood; and
(2) The elevated portion of the building shall not incur any structural damage due
to the effects of wind and water loads acting simultaneously in the event of the
base flood.
"Coastal high hazard area" - See "Zone V" and "Zone VE."
"Development" means any man-made change to improved or unimproved real
estate, including but not limited to buildings or other structures, mining, dredging,
filling, grading, paving, excavation or drilling operations or storage of equipment or
materials.
"Drainage facility" - See "Watercourse."
"Encroachment" means the advance or infringement of uses, plant growth, till,
excavation, buildings, permanent structures or development into a floodplain which
may impede or alter the flow capacity of a floodplain.
"Existing manufactured home park or subdivision" means a manufactured home
park or subdivision for which the construction of facilities for servicing the lots on which
the manufactured homes are to be affixed (including, at a minimum, the installation of
utilities, the construction of streets, and either final site grading or the pouring of
concrete pads) is completed before May 5, 1982.
"Expansion to an existing manufactured home park or subdivision" means the
preparation of additional sites by the construction of facilities for servicing the lots on
which the manufacturing homes are to be affixed (including the installation of utilities,
the construction of streets, and either final site grading or the pouring of concrete pads).
"Fill" is the placement of fill material at a specified location to bring the ground
surface up to a desired elevation.
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§ 27-12 HAWAII COUNTY CODE
"Fill material" can be natural sand, dirt, soil or rock. For the purposes of floodplain
management, fill material may include concrete, cement, soil cement, brick, or similar
material as approved on a case-by-case basis.
"Flood elevation determination" means a determination by the Federal Emergency
Management Agency of the water surface elevations of the base flood, that is, the flood
level that has a one percent or greater chance of occurrence in any given year.
"Flood elevation study" or "flood study" means an examination, evaluation, and
determination of flood hazards and, if appropriate, corresponding water surface
elevations, or an examination, evaluation, and determination of flood -related erosion
hazards.
"Flood, flooding, or floodwater" means:
(1) A general and temporary condition of partial or complete inundation of
normally dry land areas from:
(A) The overflow of inland or tidal waters;
(B) The unusual and rapid accumulation or runoff of surface waters from any
source; or
(C) Mudslides (i.e., mudflows) which are approximately caused by flooding as
defined in paragraph (1)(B) of this definition and are akin to a river of
liquid and flowing mud on the surfaces of normally dry land areas, as
when earth is carried by a current of water and deposited along the path
of the current; or
(2) The collapse or subsidence of land along the shore of a lake or other body of
water as a result of erosion or undermining caused by waves or currents of
water exceeding anticipated cyclical levels or suddenly caused by an unusually
high water level in a natural body of water, accompanied by a severe storm, or
by an unanticipated force of nature, such as flash flood or an abnormal tidal
surge, or by some similarly unusual and unforeseeable event which results in
flooding as defined in paragraph (1)(A) of this definition.
"Flood Insurance Rate Map (FIRM)" means the official map on which the Federal
Emergency Management Agency has delineated both the areas of special flood hazards
and the risk premium zones applicable to the community.
"Flood Insurance Study" means the official report provided by the Federal
Emergency Management Agency that includes flood profiles, the Flood Insurance Rate
Map, and the water surface elevation of the base flood.
"Flood protection system" means those physical structural works for which funds
have been authorized, appropriated, and expended and which have been constructed
specifically to modify flooding in order to reduce the extent of the area within a
community subject to a "special flood hazard" and the extent of the depths of associated
flooding. Such a system typically includes hurricane tidal barriers, dams, reservoirs,
levees, or dikes. These specialized flood modifying works are those constructed to
conform with sound engineering standards.
"Floodplain administrator" is the individual appointed to administer and enforce
the floodplain management regulations. This person shall be the director of public
works of the County of Hawaii or the director's duly authorized representative who
shall be a currently licensed professional engineer in the State of Hawai`i.
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FLOODPLAIN MANAGEMENT § 27-12
"Floodplain management" means the operation of an overall program of corrective
and preventive measures for reducing flood damage, including but not limited to
emergency preparedness plans, flood control works and floodplain management
regulations.
"Floodplain management regulations" means zoning ordinances, subdivision
regulations, building codes, health regulations, and special purpose ordinances (such as
a floodplain ordinance or an erosion and sedimentation control ordinance) and other
applications of police power. The term describes such state or local regulations, in any
combination thereof, which provide standards for the purpose of flood damage
prevention and reduction.
"Floodplain or flood -prone area" means any land area susceptible to being
inundated by water from any source (see definition of "flooding").
"Floodproofing" means any combination of structural and nonstructural additions,
changes, or adjustments to structures which reduce or eliminate flood damage to real
estate or improved real property, water and sanitary facilities, structures, and their
contents.
"Floodway fringe" is the areas of a floodplain on either side of the designated
floodway where encroachment may be permitted.
"Floodway" or "regulatory floodway" means the channel of a river or other
watercourse and the adjacent land areas that must be reserved in order to discharge the
base flood without cumulatively increasing the water surface elevation.
"Fraud and victimization" related to article 5, variances, of this chapter means that
the variance granted must not cause fraud on or victimization of the public. In
examining this requirement, the director of public works will consider the fact that
every newly constructed structure adds to government responsibilities and remains a
part of the community for fifty to one hundred years. Structures that are permitted to
be constructed below the base flood elevation are subject during all those years to
increased risk of damage from floods, while future owners of the structure(s) and the
community as a whole are subject to all the costs, inconvenience, danger, and suffering
that those increased flood damages bring. In addition, future owners may purchase the
structure(s), unaware that it is subject to potential flood damage, and the structure(s)
can be insured only at very high flood insurance rates.
"Freeboard" means a factor of safety usually expressed in feet above a flood level for
purposes of floodplain management. "Freeboard" tends to compensate for the many
unknown factors that could contribute to flood heights greater than the height
calculated for a selected size flood and floodway conditions, such as wave action, bridge
openings, and the hydrological effect of urbanization of the watershed.
"Functionally dependent use" means a use which cannot perform its intended
purpose unless it is located or carried out in close proximity to water. The term includes
only docking facilities, port facilities that are necessary for the loading and unloading of
cargo or passengers, and ship building and ship repair facilities, but does not include
long-term storage or related manufacturing facilities.
"General floodplain" - See "Zone A."
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§ 27-12 HAWAII COUNTY CODE
"Hardship" as related to article 5, variances, of this chapter means the hardship
that would result from a failure to grant the requested variance. The director of public
works requires that the variance be exceptional, unusual, and peculiar to the property
involved. Mere economic or financial hardship alone is not exceptional. Inconvenience,
aesthetic considerations, physical disabilities, personal preferences, or the disapproval
of one's neighbors likewise cannot, as a rule, qualify as exceptional hardships. All of
these problems can be resolved through other means, without granting a variance. This
is so even if the alternative means are more expensive or complicated than building
with a variance, or if they require the property owner to put the parcel to a different use
than originally intended, or to build elsewhere.
"Highest adjacent grade" means the highest natural elevation of the ground surface
prior to construction next to the proposed walls of a structure.
"Historic structure" means any structure that is:
(1) Listed individually in the National Register of Historic Places (a listing
maintained by the Department of Interior) or preliminarily determined by the
Secretary of the Interior as meeting the requirements for individual listing on
the National Register;
(2) Certified or preliminarily determined by the Secretary of the Interior as
contributing to the historical significance of a registered historic district or a
district preliminarily determined by the Secretary of the Interior to qualify as
a registered historic district;
(3) Individually listed on a State of Hawai`i inventory of historic places where the
historic preservation program has been approved by the Secretary of the
Interior; or
(4) Individually listed on a local inventory of historic places in communities with
historic preservation programs that have been certified either:
(A) By an approved State program as determined by the Secretary of the
Interior, or
(B) Directly by the Secretary of the Interior in states without approved
programs.
"Levee" means a man-made structure, usually an earthen embankment, designed
and constructed in accordance with sound engineering practices to contain, control, or
divert the flow of water so as to provide protection from temporary flooding.
"Levee system" means a flood protection system which consists of a levee, or levees,
and associated structures, such as closure and drainage devices, which are constructed
and operated in accord with sound engineering practices.
"Lowest floor" means the lowest floor of the lowest enclosed area (including
basement). An unfinished or flood resistant enclosure, usable solely for parking of
vehicles, building access, or storage in an area other than a basement area is not
considered a building's lowest floor provided that such enclosure is not built so as to
render the structure in violation of the applicable nonelevation design requirements of
this chapter.
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FLOODPLAIN MANAGEMENT § 27-12
"Manufactured home" means a structure, transportable in one or more sections,
which is built on a permanent chassis and is designed for use with or without a
permanent foundation when attached to the required utilities. The term "manufactured
home" includes a "mobile home" but does not include a "recreational vehicle."
"Manufactured home park or subdivision" means a parcel (or contiguous parcels) of
land divided into two or more manufactured home lots for rent or sale.
"Market value." For the purposes of determining substantial improvement, market
value pertains only to the structure in question. It does not pertain to the land,
landscaping, or detached accessory structures on the property. For determining
substantial improvement, the value of the land must always be subtracted. Acceptable
estimates of market value can be obtained from the following sources:
(1) Independent appraisals by a professional appraiser licensed by the State.
(2) Property appraisals used for tax assessment purposes by the County
department of finance, real property tax office.
(3) The value of buildings taken from National Flood Insurance Program claims
data. This value shall be used as a screening tool to identify those structures
where the substantial improvement ratio is less than forty percent or greater
than sixty percent.
"Mean sea level" means, for purposes of the National Flood Insurance Program, the
National Geodetic Vertical Datum of 1929 or other datum, to which base flood
elevations shown on a community's Flood Insurance Rate Map are referenced.
"Minimum necessary" related to article 5, variances, of this chapter means the
minimum necessary to afford relief to the applicant of a variance with a minimum
deviation from the requirements of this chapter. In the case of variances to an elevation
requirement, this means the director of public works need not grant permission for the
applicant to build at grade, for example, or even to whatever elevation the applicant
proposes, but only that level that the director of public works believes will both provide
relief and preserve the integrity of this chapter.
"New construction" for floodplain management purposes, means structures for
which the "start of construction" commenced on or after May 5, 1982, and includes any
subsequent improvements to such structures.
"New manufactured home park or subdivision" means a manufactured home park
or subdivision for which the construction of facilities for servicing the lots on which the
manufactured homes are to be affixed (including at a minimum, the installation of
utilities, the construction of streets, and either final site grading or the pouring of
concrete pads) is completed on or after May 5, 1982.
"Obstruction" includes but is not limited to any dam, wall, wharf, embankment,
levee, dike, pile, abutment, protection, excavation, channelization, bridge, conduit,
culvert, building, wire, fence, rock, gravel, refuse, fill, structure, vegetation, or other
material in, along, across, or projecting into any watercourse which may alter, impede,
retard, or change the direction and/or velocity of the flow of water, or due to its location,
its propensity to snare or collect debris carried by the flow of water or its likelihood of
being carried downstream.
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§ 27-12 HAWAII COUNTY CODE
"One -hundred -year flood" means a flood which has a one percent annual probability
of being equaled or exceeded. It is identical to the "base flood."
"One -hundred -year floodplain" means any area of land susceptible to being
inundated by water from any source generated by the one -hundred -year flood.
"Primary frontal dune" means a continuous or nearly continuous mound or ridge of
sand with relatively steep seaward and landward slopes immediately landward and
adjacent to the beach and subject to erosion and overtopping from high tides and waves
during major coastal storms. The inland limit of the primary frontal dune occurs at the
point where there is a distinct change from a relatively mild slope.
"Principal structure" means a structure used for the principal use of the property as
distinguished from an accessory use.
"Recreational vehicle" means a vehicle which is:
(1) Built on a single chassis;
(2) Four hundred square feet or less when measured at the largest horizontal
projection;
(3) Designed to be self-propelled or permanently towable by a light duty truck;
and
(4) Designed primarily not for use as a permanent dwelling but as temporary
living quarters for recreational, camping, travel, or seasonal use.
"Regulatory floodway" means the channel of a river or other watercourse and the
adjacent land areas that must be reserved in order to discharge the base flood without
cumulatively increasing the water surface elevation.
"Repetitive loss structure" means home or business that was damaged by flood two
times in the past ten years, where the cost of fully repairing the flood damage to the
building, on the average, equaled or exceeded twenty-five percent of its market value at
the time of each flood.
"Riverine" means relating to, formed by, or resembling a river (including
tributaries), stream, brook, etc.
"Sand dunes" means naturally occurring accumulations of sand in ridges or mounds
landward of the beach.
"Sheet flow area" - See "area of shallow flooding."
"Special flood hazard area" means an area having special flood or flood -related
erosion hazards, and shown on the Flood Insurance Rate Maps as Zones A, AO, AE,
A99, AH, VE or V.
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FLOODPLAIN MANAGEMENT § 27-12
"Start of construction" includes substantial improvement and other proposed new
development and means the date the building permit was issued, provided the actual
start of construction, repair, reconstruction, rehabilitation, addition, placement, or other
improvement was within one hundred -eighty days from the date of the permit. The
actual start means either the first placement of permanent construction of a structure
on a site, such as the pouring of slab or footings, the installation of piles, the
construction of columns, or any work beyond the stage of excavation; or the placement
of a manufactured home on a foundation. Permanent construction does not include land
preparation, such as clearing, grading and filling; nor does it include the installation of
streets and/or walkways; nor does it include excavation for a basement, footings, piers,
or foundations or the erection of temporary forms; nor does it include the installation on
the property of accessory buildings, such as garages or sheds not occupied as dwelling
units or not part of the main structure. For a substantial improvement, the actual start
of construction means the first alteration of any wall, ceiling, floor, or other structural
part of a building, whether or not that alteration affects the external dimensions of the
building.
"State" means the State of Hawai`i.
"Structure" means a walled and roofed building, including a gas or liquid storage
tank, that is principally above ground, as well as a manufactured home.
"Substantial damage" means damage of any origin sustained by a structure
whereby the cost of restoring the structure to its before damaged condition would equal
or exceed fifty percent of the market value of the structure before the damage occurred.
"Substantial improvement." For the purposes of this chapter, the determination of
whether any improvements constitute substantial improvements is applicable only to
structures built prior to May 5, 1982 or buildings constructed after May 5, 1982 which
were not within a special flood hazard area at the time of issuing the building permit.
"Substantial improvement" means any repair, reconstruction, rehabilitation, addition,
or other proposed new development of a structure, the cost of which equals or exceeds
fifty percent of the market value of the structure before the "start of construction" of the
improvement which shall be the sum of all costs of all such work performed in the
previous three years including the cost of the current work being considered. The value
of the structure including previous three year improvements, shall be certified by a
contractor, engineer, or architect licensed by the State and the property owner as may
be required on a form provided by the County. This term includes structures which
have incurred "substantial damage," regardless of the actual repair work performed.
The term does not, however, include either:
(1) Any project for improvement of a structure to correct existing violations of
state or local health, sanitary, or safety code specifications which have been
identified by the local code enforcement official and which are the minimum
necessary to assure safe living conditions; or
(2) Any alteration of a "historic structure," provided that the alteration will not
preclude the structure's continued designation as a "historic structure."
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§ 27-12 HAWAII COUNTY CODE
"Variance" means a grant of relief from the requirements of this chapter which
permits construction in a manner that would otherwise be prohibited by this chapter.
"Violation" means the failure of a structure or other development to be fully
compliant with the community's floodplain management regulations. A structure or
other development without the elevation certificate, other certifications, or other
evidence of compliance with this chapter is presumed to be in violation until such time
as that documentation is provided.
"Water surface elevation" means the height, in relation to the National Geodetic
Vertical Datum of 1929, (or other datum, where specified) of floods of various
magnitudes and frequencies in the floodplains of coastal or riverine areas.
"Watercourse" means a lake, river, creek, stream, wash, arroyo, channel, or other
topographic feature on or over which waters flow at least periodically. Watercourse
includes specifically designated areas in which substantial damage may occur.
"Zone A" is the special flood hazard area that corresponds to the one hundred -year
floodplains that are determined in the Flood Insurance Study by approximate methods.
Because detailed hydraulic analyses are not performed for such areas, base flood
elevations or depths have not been determined within this zone.
"Zone A99" is the special flood hazard area where enough progress has been made
on a protective system, such as dikes, dams, and levees, to consider it complete for
insurance rating purposes. Base flood elevations have not been determined for areas
designated as Zone A99.
"Zone AE" is the special flood hazard area that corresponds to the one hundred -year
floodplains that are determined in the Flood Insurance Study by detailed methods.
Whole -foot base flood elevations derived from the detailed hydraulic analyses have been
determined at selected intervals within this zone.
"Zone AH" is the special flood hazard area that corresponds to the areas of one -
hundred -year shallow flooding (usually areas of ponding) where average depths are
between one and three feet. Whole -foot base flood elevations derived from the detailed
hydraulic analyses have been determined at selected intervals within this zone.
"Zone AO" is the special flood hazard area that corresponds to the areas of one -
hundred -year shallow flooding (usually sheet flow on sloping terrain) where average
depths are between one and three feet. Average whole -foot depths derived from the
detailed hydraulic analyses have been determined within this zone.
"Zone D" corresponds to unstudied areas where flood hazards are undetermined,
but possible.
"Zone V" is the special flood hazard area that corresponds to the one hundred -year
coastal floodplains extending from offshore to the inland limit of a primary frontal dune
along an open coast and any other area subject to high velocity wave action from storms
or seismic sources. It is an area subject to high velocity waters, including coastal and
tidal inundation or tsunamis. Base flood elevations have not been determined for areas
designated as Zone V.
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FLOODPLAIN MANAGEMENT § 27-12
"Zone VE" is the special flood hazard area that corresponds to the one hundred -year
coastal floodplains extending from offshore to the inland limit of a primary frontal dune
along an open coast and any other area subject to high velocity wave action from storms
or seismic sources. It is an area subject to high velocity waters, including coastal and
tidal inundation or tsunamis. Whole -foot base flood elevations derived from the detailed
hydraulic analyses have been determined at selected intervals within this zone.
"Zone X (shaded)" are areas of moderate flood hazard corresponding to areas of the
five -hundred -year floodplain, areas of one -hundred -year flooding where average depths
are less than one foot, areas of one -hundred -year flooding where the contributing
drainage area is less than one square mile, and areas protected from the one -hundred -
year flood by levees.
"Zone X (unshaded)" are areas of minimal flood hazard corresponding to areas
outside of the five -hundred -year floodplain. Base flood elevations or depths have not
been determined for Zone X.
(1993, ord 93-78, sec 3; am 1997, ord 97-116, sec 1; am 2001, ord 01-108, secs 1 and 9;
am 2007, ord 07-169, sec 7; am 2010, ord 10-115, secs 2 and 3; am 2017, 17-56, sec 5
and 6.)
Section 27-13. Nonconforming structures.
Any nonconforming structure existing on May 5, 1982 or made nonconforming by a
change in the special flood hazard area may continue, subject to the following
conditions:
(a) Any repair, reconstruction, improvement, or addition to a nonconforming structure,
if it is considered to be substantial improvement, shall comply with the applicable
standards of this chapter.
(b) All relocated structures shall comply with the applicable standards of this chapter.
(c) Substantial improvement of a damaged, destroyed, or demolished structure located
in a floodway shall not be allowed unless a variance from the flood requirements is
obtained.
(1993, ord 93-78, sec 3; am 1997, ord 97-116, sec 2.)
Article 3. Administration.
Section 27-14. Director of public works approval.
No building permit, certificate of occupancy, or grading permit shall be issued, no
structure shall be occupied, no exception to chapter 5, the building code, shall be
certified, and no development or subdivision shall be approved in an area of special
flood hazard as determined by the director, pursuant to section 27-16, without the
approval of the director with respect to compliance with the provisions of this chapter.
(1993, ord 93-78, sec 3; am 2001, ord 01-108, sec 1; am 2007, ord 07-169, sec 8; am 2017,
ord 17-56, sec 7.)
Section 27-15. Designation of the floodplain administrator.
The director of public works of the County of Hawai`i is hereby appointed to
administer, implement, and enforce this chapter in accord with the provisions of this
chapter.
(1993, ord 93-78, sec 3; am 2001, ord 01-108, sec 1.)
27-13 SUPP. 3 (1-2018)
§ 27-16 HAWAII COUNTY CODE
Section 27-16. Duties and responsibilities of the floodplain administrator.
The floodplain administrator, with the cooperation and assistance of other County
departments, shall administer this chapter. The duties and responsibilities of the
floodplain administrator shall include, but not be limited to:
(1) Permit review.
(A) All building permits, certificates of occupancy, grading permits, and
development or subdivision proposals shall be reviewed to determine
whether the requirements of this chapter have been satisfied;
(B) All other development permits referred by other governmental
departments and agencies shall be reviewed for consistency with the
requirements of this chapter;
(C) All permits and proposals shall be reviewed to determine that the
proposed building site is reasonably safe from flooding;
(D) For proposed building sites in flood -prone areas where special flood
hazard areas have not been defined, water surface elevations have not
been provided, and there is insufficient data to identify the floodway or
coastal high hazard areas but the floodplain administrator has
determined that there are verifiable physical indications that such
hazards are present, all new construction, improvements to repetitive loss
structures and substantial improvements (including the placement of
manufactured homes) shall be:
(i) Designed and adequately anchored to prevent flotation, collapse, or
lateral movement;
(ii) Constructed of flood -resistant materials;
(iii) Constructed using methods and practices that minimize flood
damage;
(iv) Constructed with electrical, heating, ventilation, plumbing, and air
conditioning equipment and other service facilities that are designed
and/or located so as to prevent water from entering or accumulating
within the components during conditions of flooding;
(v) Reviewed to assure that all necessary permits have been received
from those governmental agencies from which approval is required by
Federal or State law, including section 404 of the Federal Water
Pollution Control Act Amendments of 1972, 33 U.S.C. 1334; and
(vi) With respect to new and replacement utilities, compliant with the
requirements of section 27-19; and
(E) All permits shall be reviewed to determine that the proposed development
when combined with all other existing and anticipated development will
not increase the water surface elevation of the base flood at any point.
(2) Information maintenance.
The floodplain administrator shall maintain the following:
(A) The Flood Insurance Study and Flood Insurance Rate Maps for the
County of Hawai`i;
SUPP. 4 (7-2018) 27-14
FLOODPLAIN MANAGEMENT § 27-16
(B) The certification of lowest floor elevation;
(C) The certification of floodproofing for spaces below the base flood elevation;
(D) The certification of final pad elevation where a site is filled above the base
flood elevation;
(E) The certification that an encroachment in the floodway will not result in
any increase in flood levels during base flood discharge; and
(F) The certification of elevation and structural support for structures in the
coastal high hazard area.
(3) Notification of actions that may alter the boundaries of flood hazard areas on
Federal Emergency Management Agency Flood Insurance Rate Maps.
(A) The floodplain administrator shall notify the council of the following
actions when they relate to areas located within Hawai`i County:
(i) A Federal Emergency Management Agency initiated map study or
restudy of flood hazard areas;
(ii) A floodplain administrator initiated map revision process, pursuant
to part 65 of the National Flood Insurance Program Regulations; and
(iii) A floodplain administrator initiated map revision process, pursuant
to a Federal Emergency Management Agency Cooperative Technical
Partners Initiative.
(B) Notification shall consist of a written message from the floodplain
administrator to the County council and shall be submitted to the County
council as soon as practical, but no later than sixty days after the date the
department of the floodplain administrator initiates any of the actions
described in paragraph (3)(A) of this section. Notification shall include,
but not be limited to:
(i) Identification of the stream or general area being studied or revised;
and
(ii) The name of the entity undertaking the flood mapping study,
restudy, or revision process.
(4) Interpretation of maps.
The floodplain administrator shall make interpretations where needed, as to
the exact location of the boundaries of the areas of special flood hazards (for
example, where there appears to be a conflict between a mapped boundary and
actual field conditions). A person contesting the location of the boundary shall
be given a reasonable opportunity to appeal the interpretation as provided in
article 5.
(5) Initiating changes in base flood elevations.
Whenever base flood elevations increase or decrease or result in a mappable
alteration of the boundaries of any special flood hazard area, as a result of
physical changes affecting flooding conditions, as soon as practical, but no
later than six months after the date such information becomes available, the
floodplain administrator shall notify the Federal Emergency Management
Agency of the changes by submitting technical or scientific data through the
Letter of Map Revision process. Such a submission is necessary so that upon
27-15 SUPP. 4 (7-2018)
§ 27-16 HAWAII COUNTY CODE
confirmation of those physical changes affecting flooding conditions, risk
premium rates and floodplain management requirements will be based upon
current data.
(6) Using other base flood data.
When base flood elevation data has not been provided in accordance with
section 27-6, the floodplain administrator shall obtain, review, and reasonably
utilize any base flood elevation and floodway data available from a Federal or
State agency, or other source, in order to administer article 4. Any such
information shall be submitted to the floodplain administrator for
consideration.
(7) Whenever a watercourse is to be altered or relocated:
(A) Require that the flood carrying capacity of the altered or relocated portion
of said watercourse is maintained;
(B) For riverine situations, notify the State of Hawaii department of land and
natural resources (commission on water resource management) and all
adjacent property owners, prior to such alteration or relocation of a
watercourse, and submit evidence of such notification to the Federal
Emergency Management Agency; and
(C) Whenever a proposed alteration or relocation occurs that would
significantly change the base flood elevation or result in a mappable
alteration of the boundaries of any special flood hazard area, technical
and scientific data through the Conditional Letter of Map Revision shall
be submitted to and approved by the Federal Emergency Management
Agency. Such a submission is necessary so that upon completion of those
physical changes affecting flooding conditions, risk premium rates and
floodplain management requirements will be based upon current data.
Work to be performed under an approved Conditional Letter of Map
Revision shall be subject to the following:
(i) Work shall not begin on any on-site development affecting or
impacting the floodplain until an approved Conditional Letter of Map
Revision is received from the Federal Emergency Management
Agency; and
(ii) Within sixty days of receiving final approval from the floodplain
administrator for the completion of the alteration or relocation of a
watercourse, the request for a Letter of Map Revision, and all other
information required by the Letter of Map Revision process shall be
submitted to the Federal Emergency Management Agency.
(8) Violations.
Take action to remedy violations of this chapter as specified in article 6.
(1993, ord 93-78, sec 3; am 2001, ord 01-108, sec 1; am 2007, ord 07-169, sec 9; am 2017,
ord 17-56, sec 8; am 2018, ord 18-25, sec 3.)
SUPP. 4 (7-2018) 27-16
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27-16.1 SUPP. 4 (7-2018)
§ 27-17 HAWAII COUNTY CODE
Article 4. Standards.
Section 27-17. Certification standards.
(a) Pre -construction and post -construction certification of elevation and floodproofing
of new construction, improvements to repetitive loss structures, development, and
substantial improvements within areas of special flood hazards shall be submitted
to the director of public works and shall be maintained as a matter of public record.
(b) Pre -construction certification.
Requirements for approval of the building permit shall include the following items,
as applicable, and any additional items as required by the director of public works
to promote public welfare and safety:
(1) Certification of building plans.
Each set of building plans shall be certified by a structural engineer or
architect, currently licensed in the State of Hawai`i, to be in compliance with
the requirements of this chapter.
(2) Elevation certification on building plans.
The elevation of the lowest floor shall be certified on each set of the building
plans by an architect, civil engineer, or land surveyor currently licensed in the
State of Hawai`i.
(3) Special flood hazards area certification.
The County of Hawai`i "Special Flood Hazard Area Certification" form, as
amended, shall be completed and certified by a structural engineer or architect
currently licensed in the State of Hawai`i. The completed "Special Flood
Hazard Certification" shall be submitted for approval with the building plans.
SUPP. 4 (7-2018) 27-16.2
(c)
FLOODPLAIN MANAGEMENT § 27-17
(4) Floodproofing certification.
For all new nonresidential construction and substantial improvement with
enclosed areas below the base flood elevation, the Federal Emergency
Management Agency "Floodproofing Certificate" form, as amended, shall be
completed and certified by a civil engineer or architect, currently licensed in
the State of Hawaii and shall be submitted for approval with the building
plans. The director of public works may require additional information
regarding the floodproofing design from the permit applicant and the applicant
shall provide it. The information required may include the design data and
calculations used in the floodproofing design, a detailed flood elevation study,
a drainage report, and other information as determined necessary by the
director of public works to establish compliance with the provisions of this
chapter and to promote public welfare and safety.
Post -construction certification.
Requirements for approval of the certificate of occupancy shall include the following
items, as applicable, and any additional items as required by the director of public
works to promote public welfare and safety:
(1) Elevation certification. The Federal Emergency Management Agency
"Elevation Certificate," as amended, shall be completed and certified by a land
surveyor, civil engineer, or architect currently licensed in the State of Hawaii
and submitted for approval with the application for the certificate of
occupancy. The information certified within the "Elevation Certificate" shall be
based on actual construction.
(2) Compliance with other requirements of this chapter.
(1993, ord 93-78, sec 3; am 2001, ord 01-108, sec 1; am 2007, ord 07-169, sec 10; am
2010, ord 10-115, sec 4; am 2017, ord 17-56, sec 9.)
Section 27-18. Standards for construction.
Standards for construction within areas of special flood hazards are established as
follows:
(a) Anchoring.
(1) New construction, improvements to repetitive loss structures, and substantial
improvements shall be adequately anchored to resist flotation, collapse or
lateral movement of the structure resulting from hydrodynamic and
hydrostatic loads, including the effects of buoyancy.
(2) All manufactured homes, including mobile homes, shall meet all standards for
structures.
(b) Construction materials and methods.
(1) New construction, improvements to repetitive loss structures, and substantial
improvement shall be constructed with materials and utility equipment
resistant to flood damage.
(2) New construction, improvements to repetitive loss structures, and substantial
improvement shall be constructed using methods and practices that minimize
flood damage.
27-17 SUPP. 3 (1-2018)
§ 27-18 HAWAII COUNTY CODE
(c)
(3) New construction, improvements to repetitive loss structures, and substantial
improvement shall be designed and constructed with electrical, heating,
ventilation, plumbing, air-conditioning equipment, and other service facilities
including, but not limited to, furnaces, heat pumps, water heaters, washers,
dryers, elevator lift equipment, electrical junction boxes, circuit breaker boxes,
and food freezers located above the base flood elevation plus any required
freeboard.
(4) Within Zones V and VE, new construction, improvements to repetitive loss
structures, and substantial improvements shall comply with the standards of
section 27-23.
(5) Recreational vehicles placed on sites within Zones AH and AE on the FIRM
shall be elevated and anchored or be on the site for less than one hundred
eighty consecutive days or be fully licensed and highway ready.
Encroachments.
(1) Within a floodway, encroachments (including fill), new construction,
improvements to repetitive loss structures, substantial improvements, and
other developments, shall be prohibited unless certified by a professional civil
engineer licensed in the State of Hawai`i, with supporting data, that the
encroachment will not cause any increase in base flood elevations during the
occurrence of the base flood discharge.
(2) Require, until a regulatory floodway is designated, that no new construction,
improvements to repetitive loss structures, substantial improvements, or other
development (including fill), shall be permitted within Zones AE on the FIRM,
unless demonstrated that the cumulative effect of the proposed development,
when combined with all other existing and anticipated development, will not
increase the water surface elevation of the base flood at any point.
(3) Within all zones of special flood hazards, but not including floodways, filling
which would result in the blockage or impediment of flow and/or induce or
aggravate flooding shall be prohibited unless certified by a professional civil
engineer licensed in the State of Hawai`i, with supporting data, that the
encroachment will not cause any increase in base flood elevations during the
occurrence of the base flood discharge.
(4) Within floodway fringe areas, filling to elevate the lowest floor of a
nonresidential structure may only be permitted where the structure:
(A) Is floodproof'ed so that below the base flood elevation plus any required
freeboard the structure is watertight with walls substantially
impermeable to the passage of water, and
(B) Has structural components capable of resisting hydrostatic and
hydrodynamic loads and the effects of buoyancy.
(5) In Zones V and VE, use of fill for structural support of buildings shall be
prohibited.
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FLOODPLAIN MANAGEMENT § 27-18
(d) Elevation and floodproofing.
(1) Within Zones AE and AH:
(A) For residential new construction, improvements to repetitive loss
structures, and substantial improvements, the lowest floor shall be
elevated to or above the base flood elevation plus a freeboard of at least
one foot.
(B) For nonresidential new construction, improvements to repetitive loss
structures, and substantial improvements, the lowest floor shall be
elevated or floodproofed to or above the base flood elevation plus a
freeboard of at least one foot. If the lowest floor is below the base flood
elevation plus the required freeboard, then the structure together with
attendant utility and sanitary facilities shall be designed, constructed,
and certified by a currently licensed professional engineer or architect in
the State of Hawai`i such that:
(i) The structure is watertight below the base flood elevation plus the
required freeboard.
(ii) The walls are substantially impermeable to the passage of water.
(iii) The structural components are capable of resisting hydrostatic and
hydrodynamic loads and the effects of buoyancy.
(C) Within Zone AH, new construction, improvements to repetitive loss
structures, and substantial improvement shall be required to provide
adequate drainage paths around structures on slopes to guide floodwaters
around and away from proposed structures.
(D) Fully enclosed areas below the lowest floor that are useable solely for
parking of vehicles, building access, or storage in an area other than a
basement and which are subject to flooding, shall be designed to
automatically equalize hydrostatic flood forces on exterior walls by
allowing for the entry and exit of floodwaters. Designs for meeting this
requirement must either be certified by a currently licensed professional
engineer or architect or meet or exceed the following criteria: A minimum
of two openings having a total net area of not less than one square inch
for every square foot of enclosed area subject to flooding shall be provided.
Each opening must be on different sides of the enclosed area. The bottom
of all openings shall be no higher than one foot above grade. Openings
may be equipped with screens, louvers, valves, or other coverings or
devices provided that they permit the automatic entry and exit of
floodwaters.
(2) Within Zone AO:
(A) For residential new construction, improvements to repetitive loss
structures, and substantial improvements, the lowest floor shall be
elevated above the highest adjacent grade at least one foot above the
depth number specified in feet on the FIRM, or at least three feet if no
depth number is specified.
27-19
§ 27-18 HAWAII COUNTY CODE
(B) For nonresidential new construction, improvements to repetitive loss
structures, and substantial improvements, the lowest floor shall be
elevated or completely floodproofed above the highest adjacent grade at
least one foot above the depth number specified in feet on the FIRM, or at
least three feet if no depth number is specified. If the lowest floor is to be
completely floodproofed, then a currently licensed professional engineer or
architect in the State of Hawai`i shall develop and/or review structural
design, specifications and plans for construction and shall certify that the
design and methods of construction are in accordance with accepted
standards of practice for the structure together with attendant utility and
sanitary facilities such that:
(i) The structure is watertight below the referenced flood elevation.
(ii) The walls are substantially impermeable to the passage of water.
(iii) The structural components are capable of resisting hydrostatic and
hydrodynamic loads and the effects of buoyancy.
(C) New construction, improvements to repetitive loss structures, and
substantial improvement shall be required to provide adequate drainage
paths around structures on slopes to guide floodwaters around and away
from proposed structures.
(3) Within Zones V and VE: New construction, improvements to repetitive loss
structures, and substantial improvement shall comply with the standards of
section 27-23.
(4) Within Zone A: New construction, improvements to repetitive loss structures,
and substantial improvement shall comply with the standards of section 27-24.
(e) Certification requirements. All new construction, improvements to repetitive loss
structures, and substantial improvement within areas of special flood hazard shall
be certified as required by the standards of section 27-17.
(1993, ord 93-78, sec 3; am 1997, ord 97-116, sec 3; am 2007, ord 07-169, sec 11; am
2010, ord 10-115, sec 5.)
Section 27-19. Standards for utilities.
(a) New and replacement water supply and sanitary sewage systems shall be designed
to minimize or eliminate infiltration of flood waters into the system and discharge
from systems into flood waters.
(b) On-site cesspools and septic systems shall be located to avoid impairment to them
or contamination from them during flooding.
(1993, ord 93-78, sec 3.)
27-20
FLOODPLAIN MANAGEMENT § 27-20
Section 27-20. Standards for subdivisions and other developments.
(a) All subdivisions and other developments within areas of special flood hazards and
flood prone areas where special flood hazard areas have not been defined, water
surface elevations have not been provided, and there is insufficient data to identify
the floodway or coastal high hazard areas but there are verifiable physical
indications that such hazards are present as determined by the flood plain
administrator, shall:
(1) Be consistent with the need to minimize flood damage;
(2) Have public utilities and facilities, such as sewer, gas, electrical, and water
systems, located and constructed to minimize flood damage; and
(3) Have adequate drainage provided to reduce exposure to flood damage.
(b) All subdivision and other development applications shall identify the areas of
special flood hazards and base flood elevations on the proposed site. If such
information is not provided by the Flood Insurance Rate Maps, the director of
public works may request and the applicant shall provide such information.
(c) Finally approved subdivision plats for subdivisions within areas of special flood
hazards shall provide base flood elevations within the lots.
(d) All new subdivision proposals and other proposed developments within areas
designated as Zone A or a flood prone area where special flood hazard areas have
not been defined, water surface elevations have not been provided, and there is
insufficient data to identify the floodway or coastal high hazard areas but the flood
plain administrator has determined that there are verifiable physical indications
that such hazards are present shall comply with the following:
(1) Be reviewed to assure that all necessary permits have been received from
those governmental agencies from which approval is required by Federal or
State law, including section 404 of the Federal Water Pollution Control Act
Amendments of 1972, 33 U.S.C. 1334;
(2) For all proposed developments and/or subdivisions greater than either fifty
lots or five acres, the developer and/or subdivider shall include base flood
elevation data within their proposal.
(3) Comply with the requirements of section 27-24.
All developments requiring a site drainage plan under section 25-2-72(3) shall
submit such a plan for review and approval by the director of public works. The
site drainage plan shall comply with sections 27-20(a) and (b) and section 27-24,
and shall include a storm water disposal system to contain run-off caused by the
proposed development, within the site boundaries, up to the expected one-hour, ten
year storm event, as shown in the department of public works "Storm Drainage
Standards," dated October 1970, or any approved revision, unless those standards
specify a greater recurrence interval. The amount of expected runoff shall be
calculated according to the department of public works "Storm Drainage
Standards," dated October 1970, or any approved revision, or by any nationally -
recognized method meeting with the approval of the director of public works.
Runoff calculations shall include the effects of all improvements.
(e)
27-21
§ 27-20 HAWAII COUNTY CODE
(f) Storm water shall be disposed into drywells, infiltration basins, or other approved
infiltration methods. The development shall not alter the general drainage pattern
above or below the development.
(1993, ord 93-78, sec 3; am 2001, ord 01-108, sec 1; am 2007, ord 07-169, sec 12.)
Section 27-21. Standards for manufactured homes.
Manufactured homes that are placed or substantially improved on sites outside of a
manufactured home park or subdivision, in a new manufactured home park or
subdivision, in an expansion to an existing manufactured home park or subdivision, or
in an existing manufactured home park or subdivision on which a manufactured home
has incurred "substantial damage" as the result of a flood shall:
(a) Within Zones AE or AH, be elevated so that either:
(1) The lowest floor of the manufactured home is at or above the base flood
elevation, or
(2) The manufactured home chassis is supported by reinforced piers or other
foundation elements of at least equivalent strength that are no less than
thirty-six inches in height above grade and be securely anchored to an
adequately anchored foundation system to resist flotation, collapse, and lateral
movement.
(b) Within Zone AO, be elevated such that the lowest floor of the manufactured home is
elevated at least as high as the depth number specified in feet on the FIRM, or at
least two feet if no depth number is specified and be securely anchored to an
adequately anchored foundation system to resist flotation, collapse, and lateral
movement.
(c) Within Zone A, comply with the standards of section 27-24.
(d) Within Zones V or VE, comply with the standards of section 27-23.
(1993, ord 93-78, sec 3.)
Section 27-22. Standards for floodways.
The floodway identified on the Flood Insurance Rate Maps and located within areas
of special flood hazard is the watercourse reserved to discharge the base flood. Since the
floodway is an extremely hazardous area due to the velocity of floodwaters which carry
debris, potential projectiles, and erosion potential, the following provisions apply:
(a) Encroachments, including fill, new construction, improvements to repetitive loss
structures, substantial improvement, and other new development shall be
prohibited unless certification and supporting data is provided by a licensed
professional engineer or architect demonstrating that the encroachment will not
cause any increase in base flood elevations during the occurrence of the base flood
discharge.
(b) If an encroachment within a floodway is allowed under the conditions of paragraph
27-22(a), all new construction, improvements to repetitive loss structures,
substantial improvement and other proposed new development shall comply with
all applicable flood hazard reduction provisions established in this chapter.
27-22
(c)
FLOODPLAIN MANAGEMENT § 27-22
The following uses, not involving fill, shall be evaluated on a case-by-case basis to
establish that the use does not cause any increase in base flood elevations:
(1) Public and private outdoor nonstructural recreational facilities, lawn, garden,
and play areas;
(2) Agricultural uses, including farm, grazing, pasture, and outdoor plant
nurseries; and
(3) Drainage improvements, such as channels and stream crossings.
(1993, ord 93-78, sec 3; am 2007, ord 07-169, sec 13.)
Section 27-23. Standards for coastal high hazard areas.
Coastal high hazard areas are identified as Zone V or Zone VE on the Flood
Insurance Rate Maps. Within coastal high hazard areas, the following standards shall
apply:
(1) All new construction, improvements to repetitive loss structures, and
substantial improvements in a coastal high hazard area shall be constructed
with materials and utility equipment resistant to flood damage and using
methods and practices that minimize flood damage.
(2) New construction, improvements to repetitive loss structures, and substantial
improvement shall be elevated on adequately anchored pilings or columns and
securely anchored to such pilings or columns so that the lowest horizontal
portion of the structural members of the lowest floor, excluding the pilings and
columns, is elevated to or above the base flood level. The pile or column
foundation and structure attached thereto shall be anchored to resist flotation,
collapse, and lateral movement due to the effects of wind and water loads
acting simultaneously on all building components. The wind and water loading
values shall each have a one percent chance of being equaled or exceeded in
any given year.
(3) New construction, improvements to repetitive loss structures, and other
development shall be located on the landward side of the reach of mean high
tide.
(4) New construction, improvements to repetitive loss structures, and substantial
improvement shall have the enclosed space, if any, below the lowest floor free
of obstructions and constructed with breakaway walls as defined in section
27-12. Such enclosed space shall not be used for human habitation and will be
useable solely for parking of vehicles, building access, or storage. Machinery
and equipment which service the building, such as furnaces, air conditioners,
heat pumps, hot water heaters, washers, dryers, elevator lift equipment,
electrical junction and circuit boxes, and food freezers are not permitted in
such enclosed spaces. The enclosed space must only be achieved with
breakaway walls, open wood latticework, or insect screening intended to
collapse under wind and water loads without causing collapse, displacement,
or other structural damage to the elevated portion of the building or
supporting foundation system. A breakaway wall shall have a design safe
loading resistance of not less than ten and no more than twenty pounds per
27-23 SUPP. 3 (1-2018)
§ 27-23 HAWAII COUNTY CODE
square foot. Use of breakaway walls which exceed a design safe loading
resistance of twenty pounds per square foot may be permitted only if a
licensed professional structural engineer certifies that the design proposed
meets the following conditions:
(A) Breakaway wall collapse shall result from a water load less than that
which would occur during the base flood; and
(B) The elevated portion of the building and supporting foundation system
shall not be subject to collapse, displacement, or other structural damage
due to the effects of wind and water loads acting simultaneously on all
building components (structural and nonstructural). Maximum wind and
water loading values to be used in this determination shall each have a
one percent chance of being equaled or exceeded in any given year (one -
hundred -year mean recurrence interval).
(5) Fill shall not be used for structural support of buildings.
(6) Man-made alteration of sand dunes and mangroves which would increase
potential flood damage is prohibited.
(7) All new construction, improvements to repetitive loss structures, development,
and substantial improvement within coastal high hazard areas shall be
certified as required by section 27-17.
(8) Recreational vehicles placed on sites within Zones V and VE on the FIRM
shall be elevated and anchored or be on the site for less than one hundred
eighty consecutive days or be fully licensed and highway ready.
(1993, ord 93-78, sec 3; am 2007, ord 07-169, sec 14; am 2010, ord 10-115, sec 6; am
2017, ord 17-56, sec 10.)
Section 27-24. Standards for general floodplain.
The general floodplain, identified as Zone A on the Flood Insurance Rate Maps, are
areas of special flood hazards for which detailed engineering studies are not performed
by the Federal Emergency Management Agency to determine the base flood elevations
and to identify the floodways.
(a) To determine base flood elevations and the locations of floodways within the
general floodplain, the director of public works may obtain, review, and reasonably
utilize any base flood elevation and floodway data available from a Federal, State,
or other source, including information requested of a permit applicant.
(b) Development or subdivision proposals shall conform with the requirements of
section 27-20.
(c) The following information shall be provided by a permit applicant to the director of
public works to evaluate the proposed construction or improvement site within a
general floodplain area:
(1) Project location and site plan showing dimensions.
(2) Relationship to floodway and floodway fringes as determined by flood elevation
study.
SUPP. 3 (1-2018) 27-24
FLOODPLAIN MANAGEMENT § 27-24
(3) Contour map showing the topography of existing ground based on elevation
reference marks on flood maps. The scale and contours are to be appropriate to
the work in question.
(4) Existing and proposed base flood elevations.
(5) Existing and proposed floodproofing and flood control measures.
The director of public works may waive informational requirements if the director
of public works has sufficient information to make an evaluation and determination
regarding flood elevation or may request further information, including a detailed
flood elevation study and a drainage report, to evaluate flood risks and determine
the applicability of flood construction and development standards.
(d) New construction, improvements to repetitive loss structures, and substantial
improvements within the general floodplain shall satisfy the requirements set forth
for Zones AE, AH, AO, or VE as is determined to be applicable by the director of
public works based on base flood information and floodway data obtained through
subsections 27-24(a) and 27-24(b).
(e) All new construction, improvements to repetitive loss structures, development, and
substantial improvement within the general floodplain shall be certified as
required by section 27-17.
(f) All manufactured homes shall be elevated and anchored to resist flotation, collapse,
or lateral movement.
(1993, ord 93-78, sec 3; am 2001, ord 01-108, sec 1; am 2007, ord 07-169, sec 15.)
Section 27-25. Standards for improvements adjacent to drainage facilities.
New construction, improvements to repetitive loss structures, and substantial
improvements proposed adjacent to drainage facilities outside of the special flood
hazard areas identified on the Flood Insurance Rate Maps shall be subject to review
and approval of the director of public works.
(a) Upon request by the director of public works, further information concerning base
flood elevation, floodways, surface water runoff, existing and proposed drainage
patterns, and other information, including a detailed flood elevation study,
drainage report, and findings and opinions by a licensed professional civil engineer,
shall be provided to evaluate potential flooding.
(b) The director of public works shall determine the applicability of the various
development and construction standards provided in this chapter based upon
information available from a Federal, State, or other source, including information
provided by the permit applicant.
(c) A drainage facility shall not be modified, constructed, lined, or altered in any way
to accommodate the improvement without the approval of the director of public
works.
(1993, ord 93-78, sec 3; am 2001, ord 01-108, sec 1; am 2007, ord 07-169, sec 16.)
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§ 27-26 HAWAII COUNTY CODE
Section 27-26. Storm drainage standards.
The department of public works, County of Hawai`i's "Storm Drainage Standard,"
October 1970 edition, or latest revision, is incorporated into and made a part of this
chapter. These standards have been prepared to guide County engineers and personnel,
engineers for subdivision and other developers, consultants employed by the
department of public works, and other interested parties in the general features
required for the design of storm drainage facilities, preparation of flood hazard studies,
and other related work in the County of Hawaii.
(1993, ord 93-78, sec 3; am 2007, ord 07-169, sec 17.)
Article 5. Variances and Appeals.
Section 27-27. Criteria for variances.
A variance from this chapter may be issued by the director of public works only
upon the applicant meeting the variance criteria of this section. The variance criterion
set forth in this section are based on the general principle of zoning law that variances
pertain to a piece of property and are not personal in nature. A properly issued variance
is granted for a parcel of property with physical characteristics so unusual that
complying with the requirements of this chapter would create an exceptional hardship
to the applicant or the surrounding property owners. The characteristics must be
unique to the property and not be shared by adjacent parcels. The unique characteristic
must pertain to the land itself, not to the structure, its inhabitants, or the property
owners.
It is the duty of the County of Hawaii to help protect its citizens from flooding. This
need is so compelling and the implications of the cost of insuring a structure built below
flood level are so serious that variances from the flood elevation or from other
requirements of this chapter are quite rare. The variance guidelines are detailed and
contain multiple provisions that must be met before a variance can be properly granted.
The following criterion are designed to screen out those situations in which alternatives
other than a variance are more appropriate:
(a) Generally, variances may be issued for new construction, improvements to
repetitive loss structures, substantial improvement, and other proposed new
development to be erected on a lot of one-half acre or less in size contiguous to
and surrounded by lots with existing structures constructed below the base
flood level, providing that the procedures of articles 3 and 4 of this chapter
have been fully considered. As the lot size increases beyond one-half acre, the
technical justification required for issuing the variance increases.
(b) Variances shall not be issued within any designated floodway if any increase
in flood levels during the base flood discharge would result.
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(c)
FLOODPLAIN MANAGEMENT § 27-27
Variances shall only be issued upon:
(1) A showing of good and sufficient cause. Under this criterion, the applicant
must demonstrate that the variance request is for land which has
physical characteristics so unusual that complying to flood requirements
will create exceptional hardship to the applicant or surrounding
landowners. The unique characteristic must pertain to the land itself and
not the structure, its inhabitants, or the property owner.
Under this criterion, only exceptional instances should arise where
the physical characteristics of properties create a hardship sufficient to
justify granting a variance. Even in a fairly common situation where an
undeveloped lot is surrounded by properties with structures built at grade
and/or below flood levels, a variance cannot be justified since an applicant
can erect the concerned structure on pilings, etc.;
(2) A determination that failure to grant the variance would result in
exceptional "hardship" (as defined in section 27-12) to the applicant.
Under this criterion, the hardship that would result from failure to grant
a requested variance must be exceptional, unusual, and peculiar to the
property involved. Economic or financial hardship alone is not
exceptional. Inconvenience, aesthetic considerations, physical disabilities,
personal preferences, or the disapproval of one's neighbors cannot,
generally, qualify as exceptional hardship. Under this criterion, for
example, a member of a household has a physical disability and wants a
variance to build the dwelling at grade or at a lower level for access
purposes. A variance should not be issued because the owner can
construct a ramp or elevator to meet flood requirements. Elevation will
allow the infirm or persons with disabilities to be evacuated in the early
stage of flooding, and, if there is insufficient warning or help in
evacuating that person, then, in all likelihood, he can survive the flood by
simply remaining in the home safely above the levels of floodwaters;
(3) A determination that the variance is the "minimum necessary" (as
defined in section 27-12), considering the flood hazard, to afford relief.
Under this criterion, the variance that is granted should be for the
minimum deviation from the flood requirements that will still alleviate
the hardship. In the case of variance to an elevation requirement, this
does not mean approval to build at grade level or to whatever elevation an
applicant proposes, but rather to a level that the director of public works
determines will provide relief and preserve the integrity of the flood
ordinance; and
(4) A determination that the granting of a variance will not result in
increased flood heights, additional threats to public safety, extraordinary
public expense, create nuisances, cause "fraud or victimization" (as
defined in section 27-12) of the public, or conflict with existing local laws
or ordinances. Under this criterion, an applicant must demonstrate that
flood levels will not be raised above the base flood elevations.
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§ 27-27 HAWAII COUNTY CODE
(d) Variances may be issued for new construction, improvements to repetitive loss
structures, substantial improvement, and other proposed new development
necessary for the conduct of a "functionally dependent use" (as defined in
section 27-12) provided that the provisions of paragraphs 27-27(a) through
27-27(c) are satisfied and that the structure or other development is protected
by methods that minimize flood damages during the base flood and create no
additional threats to public safety.
(e) Variances may be issued for the repair or rehabilitation of historic structures
upon a determination that the proposed repair or rehabilitation will not
preclude the structure's continued designation as a historic structure and the
variance is the minimum necessary to preserve the historic character and
design of the structure.
(f) Variances may be issued for improvement of a structure to correct existing
violations of State or local health, sanitary, or safety code specifications which
have been identified by the local code enforcement official and which are the
minimum necessary to assure safe living conditions.
(g) Variances may be approved with conditions. Such conditions may include:
(1) Modification of the construction or substantial improvement, including
the sewer and water facilities.
(2) Limitations on periods of use and operation.
(3) Imposition of operational controls, sureties, and deed restrictions.
(4) Requirements for construction of channels, dikes, ditches, swales, levees,
and other flood -protective measures.
(5) Floodproofing measures designed consistent with the regulatory flood
elevation, flood velocities, hydrostatic and hydrodynamic forces, and other
factors associated with the base flood.
(6) Other conditions as may be required by the director of public works to
promote public welfare and safety.
(1993, ord 93-78, sec 3; am 2001, ord 01-108, sec 1; am 2007, ord 07-169, sec 18.)
Section 27-28. Application for variance.
An application for a variance shall be submitted to the director of public works,
signed and stamped by a licensed professional engineer or architect, and shall include
three sets of documents with the following information as may be applicable:
(a) Plans and specifications showing the site and location; dimensions of all property
lines and topographic elevation of the lot; existing and proposed structures and
improvements, fill, storage area; locations and elevations of existing and proposed
streets and utilities; floodproofing measures; relationship of the site to the location
of the flood boundary; floodway; and the existing and proposed flood control
measures and improvements.
(b) Cross-sections and profile of the area and the regulatory flood elevations and profile
based on elevation reference marks on flood maps.
(c) Flood study and drainage report in areas where a study and report have not been
reviewed and accepted by the County of Hawaii.
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FLOODPLAIN MANAGEMENT § 27-28
(d) Description of surrounding properties and existing structures and uses and the
effect of the regulatory flood on them caused by the variance.
(e) Evaluation and supporting information for the variance with respect to the factors
to be considered by the director of public works as listed in paragraphs 27-27(a)
through 27-27(0.
(f) An agreement that a covenant will be inserted in the deed and other conveyance
documents of the property and recorded with the bureau of conveyances of the State
of Hawai`i, stating that the property is located in a flood hazard area subject to
flooding and flood damage; that a flood hazard variance to construct a structure
below the base flood elevation will result in increased flood insurance rates and
increases flood risks to life and property; that the property owners will not file any
lawsuit or action against the County of Hawaii for costs or damages or any claim;
that the property owners will indemnify and hold harmless the County of Hawai`i
from liability when such loss, damage, injury, or death results due to any flood
hazard variance and flooding of the property; and that upon approval of the
variance, the covenants shall be fully executed and proof of recording with the
bureau of conveyances shall be submitted to the director of public works prior to the
issuance of a building permit.
(g) Such other information as may be relevant and requested by the director of public
works.
(1993, ord 93-78, sec 3; am 2001, ord 01-108, sec 1; am 2007, ord 07-169, sec 19.)
Section 27-29. Review of variance applications.
The director of public works shall review variance applications and shall consider
all technical evaluations, relevant factors, standards specified in other sections of this
chapter, and:
(a) The danger that materials may be swept onto other lands to the injury of others;
(b) The danger of life and property due to flooding or erosion damage;
(c) The susceptibility of the proposed facility and its contents to flood damage and the
effect of such damage on the existing individual owner and future owners of the
property;
(d) The importance of the services provided by the proposed facility to the community;
(e) The necessity to the facility of a waterfront location, where applicable;
(f) The availability of alternative locations for the proposed use which are not subject
to flooding or erosion damage;
(g) The compatibility of the proposed use with existing and anticipated development;
(h) The relationship of the proposed use to the comprehensive plan and floodplain
management program, if any, for that area;
(i) The safety of access to the property in time of flood for ordinary and emergency
vehicles;
(j) The expected heights, velocity, duration, rate of rise, and sediment transport of the
flood waters expected at the site; and
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§ 27-29 HAWAII COUNTY CODE
(k) The costs of providing governmental services during and after flood conditions,
including maintenance and repair of public utilities and facilities such as sewer,
gas, electrical, and water system, and streets and bridges.
(1) Upon consideration of the factors of paragraphs 27-29(a) through 27-29(k) and the
purposes of this chapter, the director of public works may attach such conditions to
the granting of variances as it deems necessary to further the purposes of this
chapter.
(1993, ord 93-78, sec 3; am 2001, ord 01-108, sec 1.)
Section 27-30. Recording and reporting of variances.
(a) Any applicant to whom a variance is granted shall be given written notice over the
signature of the director of public works that:
(1) The issuance of a variance to construct a structure at elevations below the
base flood level will result in increased premium rates for flood insurance up
to amounts as high as $25 for $100 of insurance coverage;
(2) Such construction below the base flood level increases risks to life and
property; and
(3) A copy of the notice shall be recorded with the State of Hawai`i bureau of
conveyances and shall be recorded in a manner so that it appears in the chain
of title of the affected parcel of land.
(b) A record of all variance actions, including justifications for issuance of any variance
and written notices, shall be maintained by the director of public works. A report of
the variances issued shall be included in the biennial report submitted to the
Federal Emergency Management Agency.
(1993, ord 93-78, sec 3; am 2001, ord 01-108, sec 1; am 2007, ord 07-169, sec 20.)
Section 27-31. Appeals.
The circuit court of the third circuit, County of Hawai`i, State of Hawai`i shall hear
and decide appeals when it is alleged that there is an error in any requirement,
decision, or determination made by the floodplain administrator in the administration
or enforcement of this chapter.
(1993, ord 93-78, sec 3.)
Article 6. Enforcement.
Section 27-32. Right to enter.
Authorized representatives of the County of Hawaii are empowered to enter and
inspect properties, both public and private, for the purposes of investigating compliance
with the provisions of this chapter. The representatives shall, upon request, provide
proper identification and state the purpose of the investigation.
(1993, ord 93-78, sec 3.)
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FLOODPLAIN MANAGEMENT § 27-33
Section 27-33. Notice of violation.
Whenever any person, firm, or corporation violates any provision of this chapter,
the director of public works shall serve, either through certified mail or by hand
delivery, a notice of violation to the parties responsible for the violation.
(a) The notice of violation shall identify the violation and require the responsible party
to correct the violation and comply with applicable requirements of this chapter.
(b) The notice of violation shall include at least the following information:
(1) The date of the notice;
(2) The name and address of the person served with the notice;
(3) The tax key number of the property where the violation has been identified;
(4) The section number of the chapter or other law which has been violated;
(5) The nature of the violation;
(6) The corrective measures required to comply with this chapter;
(7) The deadline date for compliance with the notice.
(1993, ord 93-78, sec 3; am 2001, ord 01-108, sec 1.)
Section 27-34. Administrative order.
(a) In lieu of or in addition to section 27-33, if the director of public works determines
that any person, firm, or corporation is not complying with the requirements of this
chapter or a notice of violation for a violation of this chapter, the director of public
works may have the party responsible for the violation served, by certified mail or
delivery, with an order pursuant to this section.
(b) The order may require the party responsible for the violation to do any or all of the
following:
(1) Correct the violation within the time specified in the order;
(2) Pay a civil fine of not less than $500 and not more than $1,000 in the manner,
at the place, and before the date specified in the order;
(3) Pay a civil fine of not less than $500 per day and not more than $1,000 per day
for each day that the violation persists, in the manner and at the time and
place specified in the order.
(c) The order shall become final thirty days from the date of service unless the party
served requests a hearing under chapter 91, Hawaii Revised Statutes. If a hearing
is requested, no fine shall be imposed except upon completion of the hearing. In
determining the amount of the fine, the director of public works shall consider the
seriousness of the violations, any history of such violations, any good -faith efforts to
comply with the applicable requirements, the economic impact of the fine on the
violator, and such other considerations that have a bearing on the amount of the
fine.
(d) The director of public works may institute a civil action in any court of competent
jurisdiction for the enforcement of any order issued pursuant to this section. Where
the civil action has been instituted to enforce the civil fine imposed by said order,
the director of public works need only show that the notice of violation and order
were served, that a civil fine was imposed, the amount of the civil fine imposed, and
that the fine has not been paid.
(1993, ord 93-78, sec 3; am 2001, ord 01-108, sec 1; am 2007, ord 07-169, sec 21.)
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§ 27-35 HAWAII COUNTY CODE
Section 27-35. Injunctive relief.
Whenever a person, firm, or corporation has violated or continues to violate the
provisions of this chapter, notice of violation, or administrative order issued relevant to
this article, the County of Hawaii may petition the circuit court of the third district,
State of Hawaii, or the United States District Court, State of Hawaii, through the
County of Hawai`i's corporation counsel, for the issuance of a temporary or permanent
injunction, as appropriate, which restrains or compels the specific performance of the
provisions of this chapter, notice of violation, or administrative order. Such other action
as appropriate for legal and/or equitable relief may also be sought by the County of
Hawai`i. A petition for injunctive relief need not be filed as a prerequisite to taking any
other action against a user.
(1993, ord 93-78, sec 3.)
Section 27-36. Criminal enforcement.
A violation of the requirements of this chapter shall constitute a misdemeanor. Any
person violating the provisions of this chapter shall upon conviction be punished by a
fine of $1,000 or by imprisonment not exceeding one year, or both, except that in cases
where such offense shall continue after due notice, each day's continuance of the same
shall constitute a separate offense.
(1993, ord 93-78, sec 3.)
Section 27-37. Removal of encroachment and/or obstruction notices.
In addition to any other section, if any encroachment and/or obstruction exists,
under, over or through any portion of a drainageway, floodway, levee system or
watercourse within the County and the encroachment and/or obstruction is observed, or
a complaint made to the department of public works of the County of Hawai`i, then the
department of public works shall investigate and forthwith, give notice to the owner to
remove the encroachment and/or obstruction in the manner provided in this article.
(1997, ord 97-128, sec 1; am 2007, ord 07-169, sec 22.)
Section 27-38. Removal by County; costs.
If the encroachment and/or obstruction is not removed or its removal is not
commenced and diligently prosecuted prior to the expiration of thirty days after mailing
of notice, the department of public works may proceed to remove the encroachment
and/or obstruction by itself or contract for its removal. All costs incurred in the course of
removing the encroachment and/or obstruction shall be paid by owner and the County
may institute an action to recover costs and expenses for removal of the encroachment
and/or obstruction. The County may also place a lien against the encroaching and/or
obstructing parcel for any uncollected costs.
(1997, ord 97-128, sec 1.)
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