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February 27, 1997 -3- 963-2178 <br />• TABLE 3 <br />HYDROGRAPH RESPONSE SHAPE (HRS~ AND <br />MAYIMUM (MAID LENGTHS OF OVERLAND FLOW <br />;::::::,:::';::, •~: ~vtm ;. .. over::::::_' <;' :::: <br />:::;.~a:.~;;;::::.~::::~::~,::::~•:~~:••:~• :::.::::.:.::.::~:<:~~:::~~-::~~:;+:::: :..:::: :..es less than:ore to525 e:::' <br />:. ,~.. ~ [jtlel .°f:.: :::: <br />:.: :'::' :'>'::::: :....... <br />:.~.::..:~.::.: ~Iopes.o .... : °r.:'::'<:':s:.:,:::.:. <br />v..eF Z?:. o: .~.::.~.::.>..: <br /> <br />:. :.::.:.::.:::::::.:.:::.:::.::::..:..:.::.:::.,.:;::.:;:::::.::::::;..: <br />.:.::::::..HI2$..:.:;.:..;:.. <br />;. ... <br />.:::::lyfszl:e...:::: . <br />:':: ... <br />'<~:::'HRS!:'`r:;;:' <br />:''Maz;7>eit h:;.. <br />Oak Beush,etc. M 300 M 300 <br />Baze Soil (loose) M 300 F 300 <br />Baze Soil (compacted bazdsrands F 300 300 <br />and roads) and vegetated areas ' <br />subject m disturbance by traffic <br />Graveled Areas F 300 F 300 <br />"HRS - M =Medium <br />F = Fast <br />TABLE 4 <br />CONTROL PRACTICE FACTORS <br />CJ <br />;'':;,.,"::<:Watershed.:Area'"'::<::::;':;.: '<:;:;li::;:;;.<:`<:::';;.Assessinet~t:.::::::'::'<1.:'::::': :::<::':':;Conerot:Praetice~adiir:::: `': <br />Cut Slopes Assessed as protected with Soil 0.03 <br /> Guazd, considered conservative as <br /> field performance might approach <br /> 0.001 or better. <br />Fill slopes and Topsoil Smrage Pile Assessed as Hydromulched 0.64 <br />slopes Sceded. <br />Graveled roadways and bench or Gravel azeas aze assessed as 0.05 <br />pad surfaces providing 100% cover. <br />For all sites, based on prior experience by MCC with BMP's for sediment control, sediment <br />control will be accomplished using a combination of silt fences and straw bales. The <br />vegetative filter was modeled to show that it can be an effective means of secondary sediment <br />control. Neither silt fences nor straw bales aze evaluated as contributing factors in the SAE <br />effluent analysis, although in actual practice these structures will be used as the primary <br />sediment control structures for the SAE's. <br />Fill slopes are analyzed as seeded and mulched. Cut slopes aze protected with Soil Gttard <br />(trade name of sprayed protective duff. <br />SedCAD+ does not model vegetative (brush) litter as a filter. These structures were equated <br />to grass filters. The natural vegetation of the sites is either open meadow or oak brush with <br />chokecherry and servicebetry. There is a layer (minimum of 2 inches) of brush litter of the <br />ground. However, flows and velocities are so low that the litter would probably remain <br />stable and in place, or rapidly dam up in collections of debris. The ground cover (vegetative <br />ewc~asxi»ne~ru.~rn Golder Associates <br />