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4 METHODOLOGY <br /> Reference: "STORM DRAINAGE STANDARDS,Department of Public Works,County of Hawaii". <br /> October 1970. Applicable Plates and Table are provided in Appendix C. <br /> US Department of Agriculture,Natural Resources Conservation Service Web Soil <br /> Survey.http://websoilsurvey.nres.usda.gov/app/WebSoilSurvey.aspx <br /> US Department of Agriculture,Soil Conservation Service,"Erosion and Sediment <br /> Control Guide for Hawai'i",dated March 1981,as amended <br /> US Department of Commerce,National Oceanic and Atmospheric Administration <br /> (NOAA) Precipitation Frequency Estimates <br /> http://hdsc.nws.noaa.gov/hdsc/pfds/pfds_map_hi.html <br /> Design Criteria: <br /> Recurrence Interval(Tm): Tm=10 years <br /> Runoff Quantity: Since the project area is less than 100 acres,runoff was calculated using the <br /> rational method. <br /> Rational Method(Q=cIA): <br /> Q: runoff quantity or flow rate in cubic feet per second (see Appendix B - Table 1 for <br /> runoff calculations); <br /> c: runoff coefficient: <br /> Building: 1.00 <br /> AC pavement: 0.90 <br /> Existing/disturbed land: 0.32 <br /> Infiltration(medium) = 0.07 <br /> Relief(rolling 5-15%) = 0.03 <br /> Vegetal cover(none) = 0.07 <br /> Development type(agricultural) = 0.15 <br /> Landscaped area: 0.25 <br /> Infiltration(medium) = 0.07 <br /> Relief(rolling 5-15%) = 0.03 <br /> Vegetal cover(high) = 0.00 <br /> Development type(agricultural) = 0.15 <br /> Waikoloa Baptist Church Page 2 of 3 <br /> Drainage Report for Plan Approval November 2016 <br /> 2016 Belt Collins Hawaii LLC M:\Waikoloa Baptist Church\2016332400\05 Basis of Design\Reports\Drainage <br />