Laserfiche WebLink
• Runoff Volume, V. Runoff volume is calculated by SEDCAD+ as previously <br />described in the SEDCAD+ Calculations portion of the Hydrology section, and is <br />considered to be an internal input. <br />Peak Discharge, QP. Peak discharge is calculated internally within the SEDCAD+ <br />program as previously described, and is considered to be an internal input. <br />Sotl Erodibillty Factor, K. The USDA-SCS has determined K values for <br />designated soil types. Based upon the most recent SCS listing, K values for site <br />soils are as follows: <br />SOIL TYPE K <br />Coutis Fine Sandy Loam 0.20 <br />Winevada- Split Complex 0.20 <br />Winevada Fine sandy Loam 0.28 <br />Skylick Loam (FOidel Loam) 0.28 <br />• Given these values, a K factor of 0.24 was utili2ed for all sedimentology <br />calculations. <br />Representative Slope Length. The slope length is representative of the typical <br />slope length found on the subwatershed and the distance from the point of origin <br />of overland flow until the point that the slope decreases such that significant <br />deposition occurs or until flow enters a defined channel. A length of 250 feet was <br />used for all subwatersheds. <br />Average Slope. The average slope is entered in percent and is the typical or <br />representative slope for overland flow for each subwatershed. Average slope was <br />also measured directly from a 1"=400' scale map on an individual subwatershed <br />basis. <br /> <br />8 <br />