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Culvert 143 <br />This 4" HDPE pipe conveys flow from the IP Tailwater Ditch 1 into Ditch C I. The design for <br />this culvert is provided in the Pond 009 design located in Attachment 2.05.3(3)-30. <br />Culvert 144 <br />Time of Concentration (SCS) <br />Curve Number: 85 <br />Length of Flow: 923.06 ft <br />Average Land Slope: 2.19 % <br />Time of Concentration: 0.285 hrs, 17.1 mins <br />Graphical Peak Discharge Tue Mar 15 13:43:29 2016 <br />Project: New Horizon Mine By: JSS Date: 03/15/16 <br />Location: C144 Checked: Date: <br />1. Data: <br />Drainage area: .................... A = 0.6776Acres <br />Runoff Curve Number: ............. CN = 85 <br />Time of Concentration: ........... Tc; = 0.28 <br />Storm Type: ....................... = II <br />Pond and swamp areas spread <br />throughout watershed ............... = 0.00 percent of A <br />0.0000 Acres <br />2. Frequency ........................yr = 25 <br />3. Rainfall,P(24-hour).............. in = 2.40 <br />4. Initial abstraction, Ia............ = 0.3529 <br />5. Compute Ia/P....................... = 0.1471 <br />6. Unit peak discharge, qu...... csm/in = 679.39 <br />7. Runoff,Q.........................in = 1.0993 <br />8. Pond & swap adjustment factor,...Fp = 1.00 <br />9. Peak Discharge,gp...............cfs = 0.7907 <br />Attachment 2.05.3(3)-1 Page 51 June 2016 (TR -73) <br />