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water disposal svstem to contain run-off caused b~proposed <br /> development within the site boundaries up to the expected one-hour, ten <br /> year storm event as shown in the Department of Public Works "Storm <br /> Drainage Standazds "dated October 1970 or anv approved revision, <br /> unless those Standazds specify a greater recurrence interval. The amount <br /> of expected runoff shall be calculated according to the Department of <br /> Public Works "Storm Drainage Standards "dated October 1970, or anv <br /> approved revision or by anv nationally-recognized method meeting with <br /> the approval of the director of public works. Runoff calculations shall <br /> include the effects of all improvements." <br /> <br /> In addition, Bi1151 was amended by 3 floor amendments. The first floor amendment was <br /> <br /> proposed by Council Chairperson Pete Hoffmann: <br /> Chapter 27, article 4, and section 27-18, Hawaii County Code 1983 (2005 edition), is amended <br /> by adding a new subsection (c) (6) to read as follows: <br /> "(6) Within areas where the grade of the natural elevation of the ground surface prior <br /> to construction exceeds ten percent filling grading and other development <br /> which may increase the likelihood of flooding or erosion hazards shall be <br /> prohibited unless a professional civil engineer licensed in the State of Hawaii <br /> certifies that the development will not divert runoff or disturb natural protective <br /> buffers in a manner which increases the likelihood of flooding or erosion in <br /> other areas Man-made alteration of such sloping areas will be limited to no <br /> more than twentypercent of the total land area of anv lot or proposed new <br /> subdivision Any measures to be implemented in order to prevent or decrease <br /> the likelihood of run-off or erosion shall be clearly shown or described on the <br /> grading or infrastructure construction plan." <br /> This draft was further amended verbally by Council Chairperson Pete Hoffman with the <br /> following second amendment: <br /> fTFFII .l 1 1. F.. l,.a .L..l: ~1+~ al-.~ 1.., o Fl,.,.,1 <br /> L <br /> 1 7. 1 1 ...a:,... ,.F aL.,, ..:ae a.. fill; . ..,1 al.e C....I <br /> f b <br /> 1 F 1, F C11' l,..li ti,e ..e.r: C.,.,l 1.., ...F ~1 <br /> a <br /> ~ <br /> All new subdivisions and [AI1] developments requiring a site drainage <br /> plan under section 25-2-72(3) shall submit such a plan for review and <br /> approval by the director of public works. The site drainage plan shall <br /> comply with sections 27-20(a) and (b) and section 27-24, and shall include <br /> a storm water disposal system to contain run-off caused by the proposed <br /> development, within the site boundazies, up to the expected one-hour, ten <br /> year storm event, as shown in the Department of Public Works "Storm <br /> Drainage Standards," dated October 1970, or any approved revision, <br /> unless those standards specify a greater recurrence interval. The amount <br /> of expected runoff shall be calculated according to the Department of <br /> <br />