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Culvert 139 <br />Time of Concentration (SCS) <br />Curve Number: 73 <br />Length of Flow: 717.67 ft <br />Average Land Slope: 4.06 % <br />Time of Concentration: 0.248 hrs, 14.9 mins <br />Graphical Peak Discharge Tue Mar 15 11:53:49 2016 <br />Project: New Horizon Mine By: JSS Date: 03/15/16 <br />Location: C139 Checked: Date: <br />1. Data: <br />Drainage area: .................... A = 4.7226Acres <br />Runoff Curve Number: ............. CN = 73 <br />Time of Concentration: ........... Tc = 0.25 <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............ = 0.7397 <br />5. Compute Ia/P....................... = 0.3082 <br />6. Unit peak discharge, qu...... csm/in = 627.40 <br />7. Runoff,Q.........................in = 0.5144 <br />8. Pond & swap adjustment factor,...Fp = 1.00 <br />9. Peak Discharge,gp...............cfs = 2.3814 <br />Culvert 140 <br />These 2 - 4" HDPE pipes provide an inlet into Pond 009 to prevent erosion on the interior slope. <br />Since little drainage flows into these pipes, which are primarily for erosion control, no design has <br />been shown. <br />Culvert 141 <br />This 10" HDPE pipe conveys the flow from Ditches C15 and C23 into Pond 009 while <br />providing erosion control for the interior slope. The design for this culvert is provided in the <br />Pond 009 design located in Attachment 2.05.3(3)-30. <br />Culvert 142 <br />This 6" HDPE pipe conveys the flow from the IP Tailwater Ditch 2 into Ditch C I. The design <br />for this culvert is provided in the Pond 009 design located in Attachment 2.05.3(3)-30. <br />Attachment 2.05.3(3)-1 Page 50 June 2016 (TR -73) <br />