Laserfiche WebLink
<br />for the various soil types. The S.C.S. permeabilities are established by <br />douhle ring infiltrometer tests. These tests tend to overestimate the <br /> <br />inf'i'ltration rates somewhat, especially for C1reas' of moderate to steep slopes. <br />Bec<luse of these factors, the minimum infiltration rates (after saturation) <br />havl! been establ ished at approximately 1/2 of the meaSUl"e permeabi 1 ities. <br />The USGS has performed experiments on runoff determination (Greg C. Lusby, <br /> <br />"Determination of Runoff and Sediment Yield by Rainfall Simulation"', Erosion - <br /> <br />ResE!arch Techniques, Erodibility, and Sedimer~~_Delivery" Geology Abstracts, Ltd., <br />Nonl'ich, England, 1977). The S.C.S. procedun~ generally uses a lower satura- <br />. <br /> <br />tion point infiltration than might have been shown permi'ssible undelc the <br /> <br />USG~, experiments, and as such, is more conser'va ti 'Ie. <br /> <br />. <br /> <br />10 <br />