COM 0919.000 2020-2022 - Laserfiche WebLink

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16, US Sail Survey: Panaewa very cobbly hydrous loam, 2-10 percent slopes (629) These soils consist of shallow, moderately well-drained silty clay foams that formed in volcanic ash, which occur on uplands at elevations ranging from 300 to 1,000 feet and receive from 100 to 175 inches of rainfall annually. The natural vegetation consists of ohia, tree fern, Hilo grass, California grass and guava. Panaea soils are generally used for sugarcane, pasture and woodland. 17. FIRM: Zone "Xs, "AO" As shown on Faure 3 - Proposed Subdivision Plan portions of the Project Site are situated within Zone "X" - determined to be outside the 500-year flood plain. However, there is an area that traverses through the Project Site in a south-to-north direction that is subject to potential flooding events and designated "AC)",which is the special flood hazard area that corresponds to the areas of 100-year shallow flooding(usually sheet flow on sloping terrain) where average depths are between one to three feet. The Applicant will manage this shallow floodway by constructing a new underground culvert system that will channel the floodwaters along the Project Site eastern boundaries along Ainaola Drive for disposal into the existing culvert system maintained by the County at the Haihai Street-Ainaola Drive intersection. As part of the 2013 rezoning of the immediately adjacent and mauka property that supported the recently approved Waiakea Nani Estates subdivision, the Department of Public Works (DPW)commented that during the Year 2000 storm,the open ditch fronting the Project Site on Haihai Street over topped. DPW recommended that a licensed engineer design for the deepening of the entire length of the ditch. Additionally, DPW recommended the recently approved Waiakea Nani Estates subdivision provide improvements on Haihai Street up to the existing property line, which shall include but not be limited to, providing engineered closed drainage system to replace the open channel and paved shoulders and swales. The Applicant anticipates that similar recommendations may be recommended as part of the proposed subdivision of the Project Site and is prepared to do so if required by DPW. 10