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<br />Peak D; ~*~_ O ;. Peak dis~azge is calaAated internally within tha <br />SEDCAD} progra® as previously described, aryl is considered to be an <br />intc„+al i.71pUt. <br />Soil E~vdibility Factor. K. Zhe USDA~GS has detPrmirled K values for <br />designated soil types. Based upon the most recent SGS listing, K values <br />for site soils are as follows: <br />SOIL TYPE K <br />121 - Ustic 4brriorthents 0.10 <br />Mine Du[[Q Arras (Sardy Ioam) 0.20 <br /> <br />R~resentative Slone Iemgth. The slope lercJth is representative of the <br />typical slope length fermi on the subwatershed and the dictarvY, fr® }lye <br />point of origin of Overland flow until the point that the slope decreases <br />such that significant deposition ooaus or until flow enters a defined <br />channel. A length of 100 feet was used for all subwatesstyeds. <br />Average Slone. ~e average slope is entered in pervert arcs is the typical <br />or repw~.P*+tative slope for overland flow for each subway<*~~. Average <br />slope was also mr~a,,,xr directly from a 1"=200' scale map on an individual <br />subwatershed basis. <br />Control Practice Factor. CP. ~ control practice factor is defined as <br />the ratio of ~ imF+.+r loss fn>ID an area with a given Dover and <br />conservation practice to that of a field in oontinuais fallow. <br />Using Table 5.5c CP in the SEDCAD+ Users Manual, page 125: <br />Undisturt:ed (Preinine) Condition <br />Type and Height of Raised Canopy: Appreciable Brush or Bushes <br />(2 m fall height) <br />Caryopy Corer: 25 $ <br />Percrnt GYUUd Corer: 0 ~ <br />CP: .40 <br />_~ <br />,..mom ~~ <br />14Rc <br />Revised -April 1992 <br />