HomeMy WebLinkAboutCOM 0905.001 2008-2010 0 /lv /w
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County of Hawaii
Department of Water Supply
Water Use & Development Plan
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Presentation to
ENVIRONMENTAL MANAGEMENT COMMITTEE
Hawaii County Council
August 17, 2010
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Presentation Outline
Background
echnical Approach — Overview
ublic Input
Refinements
Revised Findings
Recommendations
O. No. 9os•/
Ref. Tw p/ E/'4C-
Ref. Dote NG 17 2010
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Background
Hawaii Water Plan
DOH DLNR DOA
Agriculture
Water Water Quality State Water Water Use &
Resources Plan Projects Plan Development
Protection Plan Plan
rce Protection Policies State Agricultural
`uantity Quality Needs Needs
Counties
Water Use &
Development Plans
Integrate Water Use & Land
Development Policies
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The Hawaii Water Plan
County WUDP's
tive -
-' to set forth the allocation of water to land use through
the development of policies & strategies to guide the
County in its planning, management and development of
water resources to meet projected demands"
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Technical Approach
(Overview)
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Technical Approach
e Tasks
iiventory of Existing Sources
ventory of Existing Uses
entification of Existing Water Systems
.ssessment of Land Use Plans & Policies
rojection of Future Water Demands
• Identification of Supply -side (Resource) & Demand -side
(Uses /Control) Options
• Public Participation — Stakeholder Input /Review
Technical Approach
* Use Plans & Policies
Land Use Classifications
— Generalized Land Use Policies
County General Plan
— Ultimate Development "County Vision"
County Zoning
— Allowable Development by Ordinance
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County of Hawaii
General Plan ''' tit.
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Technical Approach
a.. ° -► ected Water Demands
:wild -out Scenarios
— Sustainability of Land Use Policies
— Application of Standard Unit Rates to GP /Z
Water Demand Projections
`'- "Infill" of undeveloped or under - developed lands
— Based on Population Growth Scenarios
— Relationship with Source Availability
SUSTAINABILITY OF LAND USE POLICIES
SUSTAINABLE YIELD (WRPP)
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GENERAL PLAN (LUPAG) FULL BUILD -OUT SCENARIO
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EXISTING ZONING BUILD -OUT SCENARIO
M
H PROJECTED
EXISTING WATER DEMAND
DEMAND
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2005 2010 2015 2020 2025
U/ _LW LU1
PROJECTED DEMAND
GENERAL PLAN (LUPAG) FULL BUILD -OUT SCENARIO
EXISTING ZONING BUILD -OUT SCENARIO
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PROJECTED C
G WATER DEMAND r
Z EXISTING • • •
x DEMAND •..•• C
Lu .••••••• • PROJECTED
•**• *. ■�•• POPULATION
.* • GROWTH
EXISTING
POPULATION
L 2005 2010 2015 2020 2025
MEETING PROJECTED DEMANDS
SUSTAINABLE YIELD (WRPP)
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W GENERAL PLAN (LUPAG) FULL BUILD -OUT SCENARIO
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W EXISTING ZONING BUILD -OUT SCENARIO . ••••'
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Z DEVELOPED
Q SYSTEM CAPACITY
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♦.•♦
E _ - " . - PROJECTED
u.1 WATER DEMAND
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OBJECTIVE- "... guide the County in its
planning, management and development of
water resources to meet projected demands"
2005 2010 2015 2020 2025
O/ IV/ GALL'
Technical Approach
Identification of Resource Options
Develop Conventional Water System Infrastructure
— Typically the first option
Alternative Water Resource Measures
— Desalination
— Reclaimed Water
Demand -side Measures
— Conservation Programs
— Xeriscape /Landscape management
— Reduced Development Density
Technical Approach
• lic Participation
, .eries of Public Informational Meetings
Plan Review by Key Stakeholder Groups
,Milestone briefings to the SCWRM
.ption by County Council — formal public hearing
ocess
0/ 1V/ GO 1
Public Input
nformational Meetings held March 2006
& July 2007)
Public Input
Coinments Received after Presentation of
nitial Findings
Objection to use of Ag Unit Rate (3,400 gpd /acre)
Objection to assumption that Important Agricultural
Lands (IAL) lands are irrigated
County Planning: LUPAG Urban Expansion Area —
assumed Unit Density Rate (35 units /acre) unrealistically
high
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Refinements
Refinements
!es to application of unit rates
'resented the full build -out demands with and without
Agricultural demands
Revisited the LUPAG Urban Expansion Area unit density
rates (medium density = 35 units /ac)
0/ 10/ .01,
4 9,94
1 11
llip, Island of Hawaii
K' •
soi CWRM Aquifer Sectors
W Mauna Kea auna Kea
(Waimea) 802
803
i s NW Mauna
L oa NE Mauna Lo•
'
��. m * Mauna
.... .... -- .... Lod
., ban Expansion Unit Density Rates
ector Area
Proposed UE
Code Aquifer Sector Area density
(units /acre)
:01 Kohala 10.0
802 East Mauna Kea 8.4
°;803 West Mauna Kea 11.3
804 North East Mauna Loa 15.4
r
805 South East Mauna Loa 13.3
806 South West Mauna Loa 12.5
807 North West Mauna Loa 12.5
808 Kilauea 7.8
809 Hualalai 15.9
V / IV/ LV1'
9
Revised Findings
Summary — Island of Hawaii
Sustainable Yield — Initial and Revised Potential Demand
Zoning full build -out LUPAG full build -out
Sustainable
e Aquifer Sector Area Y! eld Initial Revised Initial Revised
w/ ag w/o ag w/ ag w/ ag w/o ag w/ ag
01 Kohala 154 177 9 174 224 40 208
802 East Mauna Kea 388 378 8 378 406 25 405
West Mauna Kea 24 151 14 151 219 52 187
- 804 North East Mauna Loa 740 107 26 107 240 119 203
IIIIIiO5 South East Mauna Loa 291 148 4 148 162 14 159
806 South West Mauna Loa 130 123 1 123 145 18 143
• 07 North West Mauna Loa 30 19 11 18 150 89
808 Kilauea 618 94 5 95 139 36 127
809 Hualalai 56 115 43 115 368 28
Total Island of Hawaii 2431 1312 120 1309 2053 593 1802
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Summary - Island of Hawaii
Sustainable Yield - Existing, Projected & Potential Demand
Zoning full LUPAG full
Existing Use Projected Use 2025 build -out build -out
.uifer Sector Area SY
(e14) Total Total
Pot. Pot w/o ag w/ ag w/o ag w/ ag
j
w/o ag w/ ag w/o ag w/ ag
ohala ( 2.3 2.3 6.5 4.3 4.3 12.3 9 174 40 208
ast Mauna Kea 388 1.9 2.8 12.4 2.4 3.8 15.8 8 378 25 405
est Mauna Kea 24 6.7 7.7 11.0 12.2 13.9 20.0 14 151 52 187
North East Mauna Loa 74� 6.4 6.4 8.3 7.7 7.7 10.4 26 107 119 203
805 South East Mauna Loa 293 0.9 1.2 4.8 1.4 1.8 7.1 4 148 14 159
806 South West Mauna Loa ( 2.6 5.6 2.8 3.9 8.4 1 123* 18 143
807 I North West Mauna 30 2 2 8.0 8.2 3.9 14.4 14.7 11 18 82 89
Loa
1 808 Kilauea 621 4.4 4.4 6.6 8.2 8.2 12.2 5 95 36 127
(M3)
1 809 Hualalai 56 11.9 15.6 16.3 18.5 24.2 25.3 43 115 20/ 282
Total Island of Hawaii 1 2410 38.6 51.0 79.6 61.5 82.1 126 120 1309 593 1802
(2431)
Island of Hawaii
801 CWRM Aquifer Sectors
W Mauna Kea . auna Ke
(Waimea) 803 willi
110alatai NW Mauna
Loa NE Mauna Lo
-.11111111
Tn SW
,O.
Mauna
' �- .. Loa
U/ 101 GU 1'
PROJECTED TOTAL DEMANDS
SECTOR AREA 801- KOHALA
(MAHUKONA, HAWI, WAIMANU)
LUPAG = 208 MGD
ZONING = 174 MGD
Sustainable Yield
- - SY 140146D— LUPAG Demand
- - -- Zoning Demand
- -r - Potable Demand
-4— Non Potable Demand
Total Demand
50
EXISTING PROJECTED DEMAND
USE
2005 2010 2015 2020 2025
PROJECTED DEMANDS EXCLUDING AG DEMANDS
SECTOR AREA 801 - KOHALA (MAHUKONA, HAWI,
WAIMANU)
Sustainable Yield
- " SY = 140 MGD LUPAG Demand
Zoning Demand
- -M - Potable Demand
—.— Non Potable Demand
a Total Demand
LUPAG = 40 MGD
50
EXISTING ZONING = 9 MGD 4.4 PROJECTED
USE DEMAND
0 2005 2010 2015 2020 2025
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PROJECTED TOTAL DEMANDS
SECTOR AREA 802 - EAST MAUNA KEA
(HONOKAA, PAAUILO, HAKALAU, ONOMEA)
LUPAG = 405 MGD
SY = 388 MGD
ZONING = 378 MGD
- — Sustainable Yield
LUPAG Demand
-- -- - - Zoning Demand
.A_ - Potable Demand
—*— Non - Potable Demand
Total Demand
150
100
50 EXISTING O JECTED DEMAND
USE Y
2005 2010 2015 2020 2025
PROJECTED DEMANDS EXCLUDING AG DEMANDS
ECTOR AREA 802 - EAST MAUNA KEA (HONOKAA,
PAAUILO, HAKALAU, ONOMEA)
4
SY = 388 MGD
Sustainable Yield
LUPAG Demand
- - Zoning Demand
_L_ - Potable Demand
-- -- —0— Non - Potable Demand
Total Demand
100
EXISTING ZONING = 8 MGD LUPAG = 25 MGD
PROJECTED
— USE _ DEMAND
2005 2010 2015 2020 2025
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PROJECTED TOTAL DEMANDS
SECTOR AREA 803 — WEST MAUNA KEA
(WAIMEA)
LUPAG = 187 MGD
ZONING = 151 MGD
Sustainable Yield
LUPAG Demand
Zoning Demand
- - -- - -- - --
- - - - Potable Demand
• Non-Potable Demand
75 - -- - - -- Total Demand
50
SY = 24 MGD PROJECTED
25 - - DEMAND
EXISTING USE
0 4-
2005 2010 2015 2020 2025
PROJECTED DEMANDS EXCLUDING AG DEMANDS
ECTOR AREA 803 — WEST MAUNA KEA (WAIMEA)
T Sustainable Yield
LUPAG Demand
Zoning Demand
-- -- - - - Potable Demand
Non- Potable Demand
Total Demand
LUPAG = 52 MGSY =24MGD
25 ECTED
ZONING = 14 MGD AND
EXISTING USE _ _ _ - - _ .
0 — — — — -
2005 2010 2015 2020 2025
0/ -LW LV
PROJECTED TOTAL DEMANDS
SECTOR AREA 804 - NORTH EAST MAUNA
LOA (HILO, KEAAU)
SY = 744 MGD
Sustainable YieId
LUPAG Demand
Zoning Demand
- - - Potable Demand
._ --�- -- Non - Potable Demand
300 Total Demand
LUPAG = 203 MGD
200
ZONING = 107 MGD
100
EXISTING USE PROJECTED DEMAND
0
2005 2010 2015 2020 2025
PROJECTED DEMANDS EXCLUDING AG DEMANDS
SECTOR AREA 804 - NORTH EAST MAUNA LOA
(HILO, KEAAU)
SY = 744 MGD
"
Sustainable Yield
LUPAG Demand
Zoning Demand
-- - -- - - -- - - - - - Potable Demand
—4-- Non - Potable Demand
- 300. — —_ _ _ — Total Demand
200
LUPAG = 119 MGD
100 - - - -- - PROJECTED
ZONING = 26 MGD / DEMAND
EXISTING USE IC
2005 2010 2015 2020 2025
U/ 1U/ LU1'
PROJECTED TOTAL DEMANDS
SECTOR AREA 805 - SOUTH EAST MAUNA
LOA (KA LAE, NAALEHU, KAPAPALA, OLAA)
SY = 293 MGD
Sustainable Yield
LUPAG Demand
Zoning Demand
LUPAG = 159 MGD - .A• - Potable Demand
— Non - Potable Demand
-"` ZONING = 148 MGD
Total Demand
100 _
50
EXISTING PROJECTED DEMAND
USE
0
2005 2010 2015 2020 2025
PROJECTED DEMANDS EXCLUDING AG DEMANDS
SECTOR AREA 805 - SOUTH EAST MAUNA LOA
(KA LAE, NAALEHU, KAPAPALA, OLAA)
SY= 293MGD
Sustainable Yield
LUPAG Demand
Zoning Demand
- -A- - Potable Demand
—s— Non- Potable Demand
tl " Total Demand
100 -- -
50
ZONING = 4 MGD LUPAG = 14 MGD PROJECTED `\
EXISTING USE *— DEMAND
0 2005 2010 2015 2020 2025
0 / IV/ GUI
PROJECTED TOTAL DEMANDS
SECTOR AREA 806 - SOUTH WEST MAUNA
LOA (KEALAKEKUA, KAAPUNA, MANUKA)
LUPAG = 143 MGD
ZONING = 123 MGD
SY = 114 MGD S ustainable Yield
LUPAG Demand
Zoning Demand
- - - Potable Demand
_ - - — 1— Non Potable Demand
• ✓ ». Total Demand
50
25
EXISTING PROJECTED DEMAND
USE
0
2005 2010 2015 2020 2025
l i PROJECTED DEMANDS EXCLUDING AG DEMANDS
SECTOR AREA 806 - SOUTH WEST MAUNA LOA
(KEALAKEKUA, KAAPUNA, MANUKA)
SY = 114 MGD Sustainable Yield
— LUPAG Demand
Zoning Demand
- - - Potable Demand
—4o— Non Potable Demand
Total Demand
LUPAG = 18 MGD
EXISTING USE ZONING = 1 MGD PROJECTED DEMAND
2005 2010 2015 2020 2025
N
U/ 1 V/ CALL '
PROJECTED TOTAL DEMANDS
SECTOR AREA 807 - NORTH WEST MAUNA LOA
(ANAEHOOMALU)
LUPAG = 89 MGD
Sustainable Yield
-- - -. - - -_ - -- -- -- -- ° —LUPAG Demand
Zoning Demand
_k_ _ Potable Demand
_ —a-- Non - Potable Demand
Total Demand
SY = 30 MGD -
30
ONING = 18 MGD
20
PROJECTED DEMA7!0 _..� - - ---
EXISTING __� •
10 _
USE $_. . _ y �. i .►
0
2005 2010 2015 2020 2025
PROJECTED DEMANDS EXCLUDING AG DEMANDS
SECTOR AREA 807 - NORTH WEST MAUNA LOA
( ANAEHOOMALU)
LUPAG = 82 MGD
Sustainable Yield
LUPAG Demand
Zoning Demand
- _A - Potable Demand
— 4*-- Non Potable Demand
Total Demand
C = 30 MGD
- . 20 _ — CTED DEMAND
EXISTING ZONING = 11 MGD
10 _.USE _— -- .— 4,— -- —
0
2005 2010 2015 2020 2025
U/ IV/ LV
PROJECTED TOTAL DEMANDS
SECTOR AREA 808 - KILAUEA
(PAHOA, KALAPANA)
SY = 621 MGD _-
Sustainable Yield
LUPAG Demand
Zoning Demand
- _A- - Potable Demand
—h– Non- Potable Demand
Total Demand
200
LUPAG = 127 MGD
100
ZON" – yo rio
EXISING
USE PROJECTED DEMAND
2005 2010 2015 2u25
PROJECTED DEMANDS EXCLUDING AG DEMANDS
SECTOR AREA 808 - KILAUEA
(PAHOA, KALAPANA)
SY = 621 MGD 0IMMYiiWr "I
Sustainable Yield
LUPAG Demand
Zoning Demand
_A- - Potable Demand
—4— Non - Potable Demand
Total Demand
- 200
100 - -
LUPAG = 36 MGD
EXISTING PROJECTED
USE ZONING = 5 MGD DEMAND
2005 2010 2015 2020 2025
w
0/ _LW LUl'
PROJECTED TOTAL DEMANDS
SECTOR AREA 809 - HUALALAI
( KEAUHOU, KIHOLO)
LUPAG = 282 MGD
ZONING = 115 MGD
Sustainable Yield
--LUPAG Demand
Zoning Demand
- - & - - Potable Demand
- - ®— Non - Potable Demand
!I) Total Demand
SY = 56 MGD
G PROJECTED DEMAND
.,..
2005 2010 2015 2020 2025
PROJECTED DEMANDS EXCLUDING AG DEMANDS
SECTOR AREA 809 - HUALALAI
(KEAUHOU, KIHOLO)
4
LUPAG = 207 MGD
Sustainable Yield
—LUPAG Demand
Zoning Demand
- - - Potable Demand
—1--- Non - Potable Demand
. --? Total Demand
100
D�
50
ZONING = 43 MGD PROJECTED DEMAND
EXISTING USE .y -+
0
2005 2010 2015 2020 2025
Summary - Island of Hawaii
Sustainable Yield - Existing, Projected & Potential Demand
Zoning full LUPAG full
Existing Use Projected Use 2025 build out build out
Aquifer Sector Area SY'
(bid) Total Pot. Total w/o ag w/ ag w/o ag w/ ag
Pot. w/o ag w/
w/o ag w/ ag ag
Kohala 140 2.3 2.3 6.5 4.3 4.3 12.3 9 174 40 208
East Mauna Kea 388 1.9 2.8 12.4 2.4 3.8 15.8 8 378 25 405
West Mauna Kea 24 I 6.7 7.7 11.0 12.2 1 13.9 20.0 14 151 187
North East Mauna Loa 740 6.4 6.4 8.3 7.7 7.7 10.4 26 107 119 203
805 South East Mauna Loa 293 0.9 1.2 4.8 1.4 1.8 7.1 4 148 14 159
806 South West Mauna Loa 1 30 1.9 2.6 5.6 2.8 3.9 8.4 1 123 18 143
807 North West Mauna 30 1 2.2 8.0 8.2 3.9 1 14.4 1 14.7 11 18 89
Loa
808 Kilauea 621 4.4 4.4 6.6 8.2 8.2 12.2 5 95 36 127
(618)
809 Hualalai 56 1 11.9 15.6 16.3 18.5 1 24.2 1 25.3 43 115 282
Total Island of Hawaii 2410 1 38.6 51.0 79.6 61.5 82.1 126 120 1309 593 1802
(2431)
Recommendations
U/ _LW LV1'
General Recommendations
mote water conservation
Use Highest Quality Water for Highest Uses
Plan for use of Non - potable Sources & Reclaimed Water
for landscape irrigation & agriculture
More monitoring & studies to determine "safe"
sustainable yields for groundwater
Anticipate "status quo" use of stream diversions until
determination of instream flow standards
Recommendations
803 — West Mauna Kea
Develop basal groundwater for potable water sources
with caution, considering the thin basal Tens
Investigate alternative sources of potable water,
including transfer of water from the Kohala Aquifer
Sector Area, surface water sources, desalination of
brackish basal water
Implement demand side conservation measures
Investigate the feasibility of non - potable water systems
(reclaimed water) in areas with concentrated
development, such as the resort complexes
0/ 1V/ GUI
Recommendations
i r 807 — Northwest Mauna Loa
tp ement strict demand -side conservation measures to
reduce average unit consumption rates
Continue to transfer water from neighboring West Mauna
Kea, and possibly, Kohala Aquifer Sector Areas. This will
require additional source development in those sector
areas
Utilize brackish groundwater and reclaimed wastewater
to satisfy irrigation needs, thereby reserving potable
sources for domestic use
•ecommendations
809 — Hualalai
mplement strict demand -side conservation measures to
reduce average unit consumption rates
` Consider managing development density of Urban
Expansion areas
Strive to reserve potable sources for domestic uses.
Investigate the feasibility of non - potable sources,
including reclaimed wastewater, brackish basal water,
and desalination
Pursue regional assessment of the sustainable yield of
high -level aquifer
• Continue to develop high -level groundwater while closely
monitoring the condition of the aquifer
0 / -LW
LV1'
Implementation Plan
Implementation Plan
WS 20 -year Water Master Plan (completed)
Implementation strategy for DWS systems
- Development of 20 -year CIP
Integration with Department of Planning Policies
— Community Development Plans
Pursue Regional Assessment of Available Water
Resources (West Hawaii)
— Hualalai — 809
— West Mauna Kea — 803
— Northwest Mauna Loa — 807
U/ .1.1J/
e draft County of Hawaii — Water Use & Development
`. Plan Update is posted on the Department of Water
Supply website: www.hawaiidws.orq
Click on "About the Water" then
"Water Use and Development Plan Update"
Questions?