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SEDIMENTATION RESERVOIR <br />Asy-2 <br />NAME: CENTRAL FACILITIES - REVISED 8/31/83 <br />`. I. RUNOFF AND VOLUMES <br />Determine: <br />Maximum runoff area and peak discharges <br />Reservoir liquid volume <br />Reservoie sediment volume <br />Total reservoir volume <br />Area: Total Drainage Area (Ad) = 35.6 Ac <br />Total area contributing to sediment <br />volume shall be the same <br />Precipitation: <br />P = 1.7 inch(es) (10-year, 24-hour precipitation event from <br />30 - the Precipitation-Frequency Atlas of the Western <br />United States, Volume III - Colorado) <br />P25 = 2_1 inch(es) (25-year, 24-hour precipitation event from <br />the Precipitation-Frequency Atlas of the Western <br />United States, Volume III - Colorado) <br />(~ <br />Use CN Avg. = 85 <br />Assume Antecedent Moisture Condition (AMC) II <br />s = 1000 - 10 (SCS Method) <br />CN <br />s = 1000 <br />85 - <br />Runoff: <br />10 = 1.76 <br />Q10 - (P10 - 0.25)'' C1.7-0.2(1.76) 73 __ 0.58 inch <br />P10 + 0.85 - 1.7+0.8 1.76 <br />Q25 (P25 - 0.25 Y'-_ C2.1-0.2(1.76) 71 _ 0.87 inch <br />P25 + 0.85 + <br />Peak Discharges: <br />For calculation of the peak discharge, use "Procedures for Determining <br />• Peak Flows in Colorado. Incorporates and Supplements Technical Release <br />~ No. 55 - Urban Hydrology for Small Watershed." Refer to Chapter 5 - <br />Tabular and Graphical Methods of Determining Peak Discharges. <br />!r\i5 ~. ' iyAS <br />