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A III td:1114LVA <br />As shown on Map 2.05.3(3) -1, Drainage Basin 16 is the basis for the Diversion D1W design. Although <br />the total basin area is 25.1 acres, there are actually three separate segments to this diversion. The <br />maximum area draining to any one segment is 13 acres, which is used as the basis for the design. <br />Graphical Peak Discharge <br />Project: NUCLA MINE <br />By: B. Langenfeld Date: 05/26/09 <br />Location: DITCH D1W <br />Checked: Date: <br />Present <br />1. Data: <br />Drainage area: .................... <br />A = 12.6050 Acres <br />Runoff Curve Number: ............. <br />CN = 79 <br />Time of Concentration: ........... <br />Tc = 0.15 <br />Storm Type: ....................... <br />=11 <br />Pond and swamp areas spread <br />throughout watershed ............... <br />= 0.00 percent of A <br />0.0000 Acres <br />2. Frequency ........................yr <br />= 10 <br />3. Rainfall ,P(24 - hour) .............. <br />in = 2.00 <br />4. Initial abstraction, la............ <br />= 0.5316 <br />5. Compute la /P ....................... <br />= 0.2658 <br />6. Unit peak discharge, qu ...... <br />csm/in = 817.30 <br />7. Runoff, Q .........................in <br />= 0.5225 <br />8. Pond & swap adjustment <br />factor .... Fp = 1.00 <br />9. Peak Discharge,gp ...............cfs <br />= 8.4104 <br />DITCH D1W <br />Channel Type: Trapezoidal, Equal Side Slopes <br />Dimensions: Left Side Slope 1.00:1 <br />Revised August 2009(PB06) Attachment 2.05.3(3) -1 -48 <br />