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DITCH C20 <br />Graphical Peak Discharge <br />Project: NUCLA MINE By: GL Date: 02/17/06 <br />Location: DITCH C20 Checked: Date: <br />Developed <br />1. Data: <br />Drainage area: .................... A = 115.6000 Acres <br />Runoff Curve Number: ............. CN = 78 <br />Time of Concentration: ........... Tc = 0.64 <br />Storm Type: ....................... = II <br />Pond and swamp areas spread <br />throughout watershed ............... = 3.00 percent of A <br />DITCH C20 <br />Channel Type: Trapezoidal, Equal Side Slopes <br />Dimensions: Left Side Slope 2.00:1 <br />Right Side Slope 2.00:1 <br />Base Dimension: 10.00 <br />Revised June 2011 (TR -60) Attachment 2.05.3(3) -1 -35 <br />3.4680 Acres <br />2. Frequency ........................yr = 100 <br />3. Rainfall,P(24- hour) .............. <br />in = 3.00 <br />4. Initial abstraction, la............ <br />= 0.5641 <br />5. Compute la /P ....................... <br />= 0.18806. <br />6. Unit peak discharge, qu <br />...... csm /in = 430.07 <br />7. Runoff ,Q .........................in <br />= 1.1288 <br />8. Pond & swap adjustment factor .... Fp = 0.75 <br />9. Peak Discharge,gp ...............cfs = 65.7668 <br />DITCH C20 <br />Channel Type: Trapezoidal, Equal Side Slopes <br />Dimensions: Left Side Slope 2.00:1 <br />Right Side Slope 2.00:1 <br />Base Dimension: 10.00 <br />Revised June 2011 (TR -60) Attachment 2.05.3(3) -1 -35 <br />