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• 2. Runoff <br />Frequency ..............: 25 yr <br />Rainfall, P (24-hour) ..: 2.4 in <br />Runoff, Q ..............:0.5529 in <br />Runoff Volume ..........:5.8437 Acre-Ft <br />3D Polyline Flow Values <br />Horiz dist: 3275.18, Slope dist: 3278.28, Vertical drop: 94.07 <br />Average slope: 2.87%, Maximum slope: 57.38% <br />Pond 11 <br />Time of Concentration (SCS Method) <br />2/20/2006 19:09 <br />• Curve Number: 74 <br />Length of Flow (ft): 2802.25 <br />Average Land Slope (percent): 2.87 <br />Time of Concentration (hrs): 0.85 <br />The pond volume below the emergency spillway will be comprised of three design needs: 1) Pit <br />pumping requirement of 6.6 acre feet, as shown above <br />2) 10 year storm inflow of 3.7 acre feet, as described above <br />3) 3 year sediment delivery of 1.08 acre feet, as based on the calculations shown below. <br />Therefore, the total design volume below the emergency spillway is 6.6 + 3.7 + 1.1 ac-ft which is <br />11.4 acre feet. As is shown on the stage storage relationship, the bottom of the emergency <br />spillway is 5627.0', which has a volume of 11.47 acre feet at this elevation. <br />Pond Volume Calculation based on Universal Soil Loss Equation <br />------------------------------------------------------------------- <br />------------------------------------------------------------------- <br />• <br />REVLSED MARCH 2006 Attachment 2.05.3(3)-14-5 <br />