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<br />8.35 inches for 2,585 square miles was computed for the Two Forks <br /> <br /> <br />design storm. The design rainflood.volume 3,17 inches was 38 percent <br /> <br /> <br />of the depth-duration value, 8.35 inches. The 24-hour, depth-duration <br /> <br />value of that portion of the design storm for Narrows damsite which <br /> <br />occurs above Two Forks damsite was 5,80 inches (see Table 1 of design <br /> <br />storm memorandum). Assuming that 38 percent of 5.80 inches would <br /> <br />become runoff, a value of 2.20 inches of total excess precipitation <br /> <br />for the 2,585~square-mile area above Two Forks damsite was computed <br /> <br />and used. <br /> <br />Subarea incremental design storm precipitation values as arranged for <br /> <br />use and respective incremental excess precipitation values used for <br /> <br />each suba~ea are listed in Table A~5, attached. Subareas for which <br /> <br />identical excess precipitation increments are applicable1are grouped <br /> <br />together, <br /> <br />Subarea Design Flood Contributions <br /> <br /> <br />As.stated in the text of this study, a copy of the discharges of <br /> <br /> <br />rainflood runoff for each subarea computed by the FGRAPH program is <br /> <br /> <br />filed with the supporting data for the study. <br /> <br />A hydro graph of the total inflow to Chatfield Reservoir was obtained <br /> <br /> <br />by lagging the rainflood discharges at Two Forks damsite (derivation <br /> <br /> <br />described in text of this study) 2 hours for traveltime to the <br /> <br /> <br />reservoir, adding the discharges recorded at the gage, South Platte <br /> <br />" <br /> <br />18 <br /> <br />.. <br /> <br />"".' <br /> <br />."..,......'. <br /> <br />..'-7..... '.. <br /> <br />~a"" <br /> <br />. <br />