2009-09-04_PERMIT FILE - C1982056 (4)

Home Browse Search

0 Following is a more detailed listing of the above summarized information: Perimeter Drainage Ditches, 10 -Year, 24 -Hour Erodible Perimeter Drainage Ditch I Erodible channel velocity = 4.71 fps Erodible channel limiting velocity = 5.0 fps Erodible channel maximum discharge = 4.82 cfs Erodible channel maximum water depth = 0.58 feet As -built erodible channel available freeboard = 1.42 feet Vegetated Perimeter Drainage Ditch 1 Vegetated channel velocity = 1.34 fps Vegetated channel limiting velocity = 5.0 fps Vegetated channel maximum discharge = 4.66 cfs Vegetated channel maximum water depth = 1.07 feet As -built vegetated channel available freeboard = 0.93 feet Erodible Perimeter Drainage Ditch 2 Erodible channel velocity = 2.45 fps Erodible channel limiting velocity = 5.0 fps Erodible channel maximum discharge = 0.37 cfs Erodible channel maximum water depth = 0.22 feet As -built erodible channel available freeboard = 1.78 feet Vegetated Perimeter Drainage Ditch 2 Vegetated channel velocity = 0.29 fps Vegetated channel limiting velocity = 5.0 fps Vegetated channel maximum discharge = 0.31 cfs Vegetated channel maximum water depth = 0.59 feet As -built vegetated channel available freeboard = 1.41 feet Sediment Pond 10 -year, 24 -hour rainfall runoff volume = 0.7822 ac -ft 25 -year, 24 -hour rainfall runoff peak = 6.990 cfs 3 -year sediment storage volume = 0.002 acre -feet 10 -year, 24 -hour peak sediment concentration (erodible perimeter drainage ditches) = 43 mg/L 10 -year, 24 -hour peak sediment concentration (vegetated perimeter drainage ditches) = 40 mg/L 10 -year, 24 -hour peak settleable concentration = 0.00 mL/L Spillway (12 feet wide with crest length in direction of flow of 3 feet with Erodible Permneter Drainage Ditches — 25 year, 24 -hour event) Spillway entrance maximum water depth above sill = 0.41 feet Spillway entrance freeboard = 1.08 feet Spillway entrance peak discharge = 6.990 cfs Downstream Earth -lined Erodible Channel (immediately downstream from spillway with Erodible Perimeter Drainage Ditches — 25 year, 24 -hour event) Erodible channel (below spillway) velocity = 2.28 fps Erodible channel (below spillway) limiting velocity = 5.0 fps Erodible channel (below spillway) maximum discharge = 6.990 cfs Erodible channel (below spillway) maximum water depth = 0.25 feet TCC 6MN Intake Shaft Facility 6 Water & Earth Technologies, Inc. Drainage and Sediment Control System Design April 24, 2009