Laserfiche WebLink
DITCH D1 W <br />As shown on Map 2.05.3(3) -20, there are several different sub - watersheds that drain to Ditch D1 W. <br />Therefore, Ditch D1 W is sized based on the largest, or worst case, sub - watershed. <br />Graphical Peak Discharge <br />Project: NUCLA MINE By: B. Langenfeld Date: 05/26/11 <br />Location: DITCH D1 W <br />Present <br />1. Data: <br />Drainage area: .................... A = 6.7800 Acres <br />Runoff Curve Number: ............. CN = 83 <br />Time of Concentration: ........... Tc = 0.17 <br />Storm Type: ....................... = II <br />Pond and swamp areas spread <br />throughout watershed ............... = 0.00 percent of A <br />2. Frequency ........................yr <br />= 25 <br />3. Rainfall ,P(24 - hour) .............. <br />in = 2.40 <br />4. Initial abstraction, la............ = 0.4096 <br />5. Compute la /P ....................... = 0.1707 <br />6. Unit peak discharge, qu ...... <br />csm /in = 815.69 <br />7. Runoff ,Q .........................in <br />= 0.9809 <br />8. Pond & swap adjustment <br />factor .... Fp = 1.00 <br />9. Peak Discharge,gp ...............cfs <br />= 8.4765 <br />DITCH D1W <br />Channel Type: Trapezoidal, Unequal Side Slopes <br />Dimensions: Left Side Slope 1.50:1 <br />Right Side Slope 1.30:1 <br />Base Dimension: 3.50 <br />Revised June 2011 (TR -60) Attachment 2.05.3(3) -1 -48 <br />