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Yoshio Inaba, et.al. November 30, 2005 <br /> Change of Zone Bill 162 <br /> Puukapu, Lot 101 <br /> The project site is presently in use grazing cattle and has been since the early <br /> 1970's. The rectangular shape site containing an area of 43.8 acres is proposed to be <br /> subdivided into eight (8) agriculture 5 acre parcels. As requested we are furnishing a <br /> preliminary determination of increase in runoff due to development. (See attached <br /> reduced copy of Change of Zone Map.) <br /> The site generally slopes from the north (Hawaiian Homes pasture) toward the south <br /> (Mamalahoa Highway), existing on site grades range from 0 to 10% or flat to moderate. <br /> (See attached reduced copy of Site Contour Map.) <br /> The County of Hawaii, "Storm Drainage Standards" and Department of Public <br /> Works requires a Tm 10 yr. storm interval and the use of the "Rational Method "for <br /> determination of runoff for this project. <br /> We estimate increase in imperviousness due to construction of homes (8), <br /> driveways, and road improvements (assumed r-o-w fully impervious) to be 1.57 acres or <br /> 3.58 % of the 43.8 acre site. <br /> Pre-development peak site runoff <br /> For a tm 10 yr. Storm = 10.5 CFS <br /> Post-development peak site runoff <br /> For a tm 10 yr. Storm = 12.4 CFS <br /> INCREASE IN TM 10 YR. PEAK RUNOFF = <br /> 12.4 CFS - 10.5 CFS = 1.9 CFS or 2 CFS TO BE CONTAINED ON SITE <br /> During the subdivision design and approval process we will comply with the <br /> requirements of the Department of Public Works, Planning Department, Department of <br /> <br /> Water Supply, and utility companies. <br /> <br />