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North Portal - Reclamation <br />Ditches across Reclaimed Area <br />Calculation Rational and Results Summary <br />Rational: <br />Peak flows were calculated using SedCad 4.0. <br />Flow paths, areas and slopes obtained using AutoCad drawings. See Exhibit 8C for <br />proposed ditch locations. <br />Soils: <br />Upland Area - Soil Type is D <br />Reclaimed Area - Soil Type B <br />Curve Number: <br />Curve numbers are based on Table 2 -2d - Runoff curve numbers for and and semiarid <br />rangeland. <br />Cover Type Hydrologic Condition Soil Type Curve Number <br />Herbaceous Good B 62 <br />Herbaceous Poor D 93 <br />Pinyon- Juniper Poor D 89 <br />10 -year 24 -hour storm event of 1.4" used for all run -off calculations. <br />Results: <br />Ditches for the Roadside north area were designed using Manning's equation in Excel. <br />SedCad is not able to handle large flows and steep slopes, so for consistency, excel was <br />used for all ditch designs. Ditch D13 was provided with a generic ditch design as shown <br />on Exhibit 8C as it has very little flow entering the channel and neither SedCad or excel <br />was able to provide a ditch design. <br />The SedCad calcu <br />were prepared by <br />correct to the J <br />s/i. <br />T <br />ation presented on pages 14 -6 -118 to 14- 6 -146c <br />9 of May 2012 and the information is true and <br />d belief. <br />Date <br />PR -5 14 -6 -118 (Rev. 05/12) <br />