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<br />May 6 to 1700 hour May 7 when rain changed to snow. <br /> <br />Computed hourly retention loss rate, 0.17 inch/hour. <br /> <br />Enough information became available to make the procedure to computing <br /> <br />excess precipitation values given in "Design of Small Dams," 2d <br /> <br />Edition, preferable to obtaining excess precipitation values from <br /> <br />judgment estimates of constant retention loss rates. <br /> <br />We obtained from the Land Use Commission of Colorado a set of General <br /> <br /> <br />Soil Maps for each county in the State (except for part of Larimer <br /> <br /> <br />County which had not yet been published) intended for use for general <br /> <br /> <br />planning purposes and a map of Colorado showing Existing Land Use as <br /> <br /> <br />of J.uly 1973. The General Soil Maps, were prepared by the Soil <br /> <br /> <br />Conservation Service, U.S. Department of Agriculture. Areas of. soil <br /> <br /> <br />associations are delineated and numbered on each map. Data sheets <br /> <br /> <br />for the set of maps list the name of the soil association, the names <br /> <br />of each soil in the association, and its characteristics in regard to <br /> <br /> <br />engineering uses. The Existing Land Use Map.was prepared through a <br /> <br /> <br />.cooperative effort of the Colorado Land Use Commission, the U.S. Soil <br /> <br /> <br />Conservation Service, and the 88 Colorado Soil Conservation Districts. . <br /> <br />A detailed study of these maps provided gqqd data for the procedure <br /> <br />of computing excess precipitation, A dominant (extent greater than <br /> <br />50 percent of subject area) hydrologic soil group was determined:for <br /> <br />each subarea except those designated by the prefix MU and for the <br /> <br />16 <br /> <br />" <br /> <br />"',. ',,.-.' .......~...., ~.< <br /> <br />_,~.,-:"'. ....5'...~. <br /> <br />. ~ ~)-,..'r"(!~<' .~._~_ L;~.:.l...~', ,.........,. <br /> <br />'W- <br /> <br />. <br />