COR-17-109840(PLA) - Laserfiche WebLink

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1 PROJECT DESCRIPTION 1 .1 PROJECT BACKGROUND AND PURPOSE The purpose of this report is to:assess the drainage impact resulting from the proposed improvements;and determine the improvements required to control rainfall runoff. 1 .2 PROJECT SITE The project site is located within Waikoloa Village,Hawaii;Tax Map Keys:6-8-002:031 and 056. The site is located near the Waikoloa Golf Club,see Appendix A Figure 1:Location Map. The property area is approximately 12.4 acres. 2 EXISTING CONDITIONS The project is within Federal Emergency Management Agency's Flood Hazard Zone X,or within an area determined to be outside the 0.2 percent annual chance floodplain,see the Flood Hazard Assessment Report included in Appendix C. Off-site runoff onto the site from the west,north or east is not anticipated as:the site slopes downward from east to west,see Appendix A Figure 2 for existing topographic survey;there appears to be a dry swale paralleling the northern boundary;and there are existing catch basins along Paniolo Avenue,a County of Hawaii maintained roadway to the east However,Auwaiakekua Gulch crosses thru the Pheasant Ridge development to the west,then thru the site and exits along the western boundary. It is noted that a drainage easement for Auwaiakekua Gulch will need to be established through this property;which will be addressed in a separate Drainage Report. Existing improvements include: pre-school/worship,parsonage and garage buildings, asphalt concrete(AC)paved parking lot and gravel driveway.Additionally,the middle portion of the site appears to have been graded/disturbed. The pre-existing surface is classified as Hapuna- Waikui-Lalamilo complex. The Hapuna soil has a high runoff and low infiltrate rate;whereas the Waikui and Lalamilo soils have low runoff and high infiltration rates;see Appendix C for Web Soil Survey's:aerial view of the site,soil classification and descriptions. 3 PROPOSED CONDITIONS The proposed improvements include:a worship center,community center and parsonage buildings;a Verizon building,antenna and telephone conduits;AC paved driveways and parking lot; a basketball court and baseball field;and utilities. The proposed grading will generally slope downwards from east to west similar to the existing condition;see Appendix A Figure 3 for proposed conditions and grading. Waikoloa Baptist Church Page 1 of 3 Drainage Report for Plan Approval November 2016 ©2016 Belt Collins Hawaii LLC M:\Waikoloa Baptist Church\2016332400\05 Basis of Design\Reports\Drainage