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A 1 N A ENGINEERS INC. <br /> CIVIL ENGINEERS AND SURVEYORS ENGINEERING IVI810� <br /> [P] (808)895-6173 [F](808)331-0449 [E]pdahlberg6hawaii.rr.com .� ;✓ <br /> Reviewed <br /> TRANSMITTAL SHEET 30 March 2021 c <br /> Date <br /> To: County of Hawaii DPW - Engineering Approved D Not Approved <br /> 74-5044 Ane Keohokalole Hwy. D Approved as Noted <br /> Kailua-Kona, HI 96740 <br /> For Hawaii County Code .� <br /> FOR YOUR REVIEW& COORDINATION Section 25-2-72 <br /> Phone: (808) 323-4850 0 LA Q L. E X <br /> Re: TMK (3) 7—5—022 : 161 (Pham Residence) C)p <br /> Pages: Z7- (including cover) 1Y 3t }Ml ,T-,iA <br /> Attached drainage study and associated information for the subject TMK as <br /> required by Hawaii County Code, Chapter 25, Section 25-2-72 (3). Attachment 1 <br /> shows site location on Hawaii Island; map provided by the County of Hawaii <br /> Storm Drainage Standard (SDS). <br /> The parcel is in flood zone "X" as identified on the current Flood insurance Rate <br /> Map (FIRM Community Panel Number 1551660738F). <br /> Attachment 2 is a calculation of development generated runoff using the Rational <br /> Equation, with rainfall intensity variable defined in accordance with SDS. The 10- <br /> year, 1-hour storm is the design basis. <br /> The proposed improvements, subject to Plan Approval, are provided as <br /> Attachment 3, with specified drainage devices and typical detail (Attachment 4). <br /> CODE: Runoff caused by the proposed development will not increase when <br /> considering existing and pre-existing impermeable areas. The development shall <br /> not alter the general drainage pattern above or below the development. <br /> Please contact me with any questions. <br /> (L�G�' P",Z�3� <br /> Peter J.K. Dahlberg, PE <br /> Attachments: <br /> 1. County of Hawaii Hyetograph (1 page, 8.5" x 11") <br /> 2. Drainage Study (1 page) <br /> 3. Site Plan for Drainage Study (1 page) <br /> 4. Typical Sump Detail (1 page) <br /> SCANNED <br /> JUN 2 5 20-LI <br /> R�;I`t21o3� <br />