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• <br />= 3400 ft. <br />x = 210 = 0.0617 <br />then LS = ~ 3~~1 0.5 <br />H = 210 ft. <br />C 430(0.6176)2 + 30(0.6176) + 0.431 <br />. 13 / <br />LS = 6.843 3.923 <br />~.~ <br />LS = 4.05 <br />• <br />• <br />The control practice factor (CP) for the watershed of Pond 003 was <br />estimated to be 1.00 for fresh cultivated land with no conservation <br />treatment for a conservative approach (Barfield et al, 1981). <br />Next a stage-discharge relationship was determined for the modified <br />principal spillway. Pond 003 has an existing 36" CMP spillway and this <br />was left in place. But the inlet opening will be reduced to increase <br />detention time for proper storage and treatment of the 10-year, 24-hour <br />storm event. By trial and error a 6" CMP opening was determined to give <br />maximum detention time and still dewater the pond within a reasonable <br />amount of time (see Exhibit 7-11 for detail of spillway). The <br />stage-discharge relationship for the 6" CMP principal spillway was <br />determined using Dodson & Associates, Ines software far the analysis of <br />a pipe culvert and the results are listed in Table 3. <br />Lastly, Pond 003 basin geometry was calculated as follows (see Exhibit <br />7-11). <br />Accumulated <br />Storage <br />Elevation Staae (ft) ac.-ft. Descriotio <br />6568 0.00 0.00 Bottom of Pond <br />6577.10 9.10 5.13 (2+) MUSLE, and <br /> Principal Spillway <br /> Inlet Elevation <br />6577.38 9.38 5.38 10-year, 24-Viour Peak <br /> Stage <br />6578.41 10.41 6.38 (1)Ac.-f t. Pit Pumpage <br />6577.69 9.69 5.68 25-year, 24-hour Peak <br /> Stage <br />6580.00 12.00 7.99 Emergency Spillway <br /> Elevation <br />7-6b-4 <br />Revised 8/27/86 <br />