Laserfiche WebLink
The WWHM basin input is shown below. The existing pond access road at the south end of the <br /> site was left out of the calculation since this area will remain undeveloped. <br /> 1 Subbasin Name:FBa in 1 <br /> Surface Interflow Groundwater <br /> Flows To : _... <br /> Area in Basin v, Show Only Selected <br /> ' Available Pervious Acres Available Impervious Acres <br /> C Fork Flat 47 <br /> 1-11,Fores# 1od' <br /> ,4324 <br /> I � <br /> �= Forest Steed, l <br /> POC 1 Predeveloped Flow: <br /> Flow Frequency <br /> I1F1.ow(cfs)' .501 15ra <br /> 2 Year 0 "50289 The site area is less than 3 acres, so a sediment <br /> 15 Year = ° 043 trap will be used to provide erosion and sediment <br /> 1 110 Year = 0 0535 control during construction. <br /> 25 Year = 0 . 06-7 <br /> 150 Year = 0 . 0776 The sediment trap is sized based on the 2-year <br /> 1100 Year _ 0.0884 WWHM peak flow using 15-minute time steps (02). <br /> 02 = 0.0289 cfs <br /> Required surface area at overflow weir = 2,080 * Q2 <br /> = 2,080 * 0.0289 cfs <br /> = 60.1 sf required <br /> ' Surface area provided per plans = 400 sf <br /> I <br /> 2215 N.30th Street.#300 <br /> Tacoma,WA 98403 <br /> Tacoma Screw Products, Inc. <br /> ' 253 383 2422 TEL 2140210.10 App <br /> -. <br /> 253 383 2572 FAX <br /> TESC Calculations D-2 <br /> www.ahbl.com <br />