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<br />To obtain the Accumulated PrecipitatiCll1..the graph Rainfall Dbtri- <br />butions For Colorad~()riginating with 5CS was used. <br /> <br />..... <br />v <br /> <br /> <br />Soils Associa.tions for watershed basin of (Point <br /> <br />5"/0 Nunn-Fort Collins a88ociation <br />5"/0 Truckton-Bresser-Blakeland auoc. <br />490/0 Fondis-Kutch association \- <br />4B% Brussett-:Jarre association <br />2% Kettle-Pring-Peyton association <br /> <br />(l) <br />B-C Soil Group <br />B II " <br />C II " <br />B " " <br />B II " <br /> <br />The vege~tive conditions were considered between ~!.r and\l?.oi~1 The <br />abovC! ""as the basis for selecting a weighted soil cov~~omplex numbers <br />of 79 'for the watershed basins of Points 1 and 2, an4!L~,f9r the watershed <br />basin of Point 3. ,:r <br /> <br />A Time of Concentration (Tel was obtained for all 3 points by using <br />, <br />the equation from California Culverts Practice, California Highways and <br />Public Works, September 1942 taken from the United States Dept. of <br />Interior, Bureau of Reclamation, Design of Small Dams p 71. <br /> <br />, ] O,l&S <br />The equation is Tc = ( ll.~ L i-" , <br /> <br />,0 <br /> <br />~', <br />in which Tc results in hours <br />L is the length of long..t waterway in miles <br />H is the difference in elevation in feet. <br /> <br />The calculations in the enclosed tabulation led to .stablbhing: <br /> <br />('1) The Unit Hydrograph > <br />(Z) Tabulation for increments of runoff ...- <br />()3) Tabulation for Storm Hydrograph ...- <br />\. <br />I t,f\ <br />The procedure of Table 16. ,~, 'p 16. 12, SCS National Engineering v <br />Handbook, Hydrology, Section 4, w.!!~ped tCl~()1:Jtain thfl coo;rcllna!!...for v <br />~nitl1y_drographs. ' <br /> <br />The Accumulated Runoff 'was obtained fro Table <br />Proc-eduresfor-De'fer'mrlrlngPeakFlows in Colorado, <br />--1\ Agriculture. Soil Conservation Service, Dec. 1972. <br /> <br />3,1 p 62 8. 63. <br />U. S. Dept. of <br /> <br />v' <br /> <br />,\ ',0,'" <br />" <br /> <br />In plain language these calculations mean that with a hYP-otb~iClll <br />frequency of once in 100 years the following water nows can be expected <br />at the 3 study points. <br /> <br />-4- <br />