Laserfiche WebLink
• then LS = 153331 0'S ~ 430(0.122)2 + 30(0.122) + 0.43 <br />~s <br />LS = 8.571 r 10.4901 <br />` 6.613 J <br />LS = 12.6 <br />The control practice factor (CP) was estimated to be 1.00 for fresh <br />cultivated land with no conservation treatment for a conservative value <br />(Barfield etal, 1981). <br />Next, a stage-discharge relationship was calculated for the principal <br />spillway. Pond 004 has an existing 36" CMP spillway and this was left <br />in place but the inlet opening will be reduced to increase detention <br />time for storage and treatment of the 10-year, 24-hour storm event. By <br />trial and error a 6" CMP opening was determined to give maximum <br />detention time and still dewater the pond within a reasonable amount of <br />time (see Exhibit 7-12 for detail of spillway modification). The <br />stage-discharge relationship for the 6" .CMP principal spillway was <br />• determined using Dodson & Associates, Ines software for the analysis of <br />a pipe culvert and the results are listed in Table 3. <br />Lastly, Pond 004 basin geometry was calculated as follows (see Exhibit <br />7-11). <br /> <br /> <br />Elevation <br /> <br />Stage (ft) Accumulated <br />Storage <br />ac.-f t. <br /> <br />Description <br />6936.00 0.00 0.00 Bottom of Pond <br />6945.20 9.20 9.96 (2+) MUSLE, and <br /> Principal Spillway <br /> Inlet Elevation <br />6946.20 11.218 15.73 10-year, 24-hour Peak <br /> Stage <br />6946.50 11.52 16.73 (1)Ac.-ft. Pit Pumpage <br />6948.13 12.13 18.78 25-year, 24-hour Peak <br /> Stage <br />6948.00 12.00 18.31 Emergency Spillway <br /> Elevation <br />• <br />7-6c-4 Revised 8/27/86 <br />