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Culvert 138 <br /> Time of Concentration(SCS) Fri Dec 15 10:01:38 2017 <br /> Project: New Horizon Mine By: JSS Date: 12/15/17 <br /> Location: C138 Checked: Date: <br /> Curve Number: 63 <br /> Length of Flow: 1436.61 ft <br /> Average Land Slope: 5.11 % <br /> Time of Concentration: 0.502 hrs, 30.1 mins <br /> Graphical Peak Discharge Fri Dec 15 10:02:12 2017 <br /> Project: New Horizon Mine By: JSS Date: 12/15/17 <br /> Location: C138 Checked: Date: <br /> Present <br /> 1. Data: <br /> Drainage area:....................A=34.8029Acres <br /> Runoff Curve Number:.............CN=63 <br /> Time of Concentration:...........Tc=0.50 <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= 100 <br /> 3. Rainfall,P(24-hour)..............in=3.00 <br /> 4. Initial abstraction, Ia............ = 1.1746 <br /> 5. Compute Ia/P....................... =0.3915 <br /> 6. Unit peak discharge, qu......csm/in= 358.94 <br /> 7. Runoff,Q.........................in= 0.4328 <br /> 8. Pond& swap adjustment factor,...Fp= 1.00 <br /> 9. Peak Discharge,gp...............cfs= 8.4482 <br /> This 18" HDPE pipe has been installed to cross San Miguel Draw flowing into Pond 007 for use <br /> by the landowner and is not designed to be part of the mining and reclamation plan. The <br /> landowner has requested this culvert be retained as a permanent structure. <br /> Attachment 2.05.3(3)-1 Page 39 December 2017 (TR-83) <br />