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Home My WebLink AboutCENTRE FOR ADVANCED TECHNOLOGY 2ND FILING (2), ` DATEx 1-14-87 PROJECT: C A T -BUSINESS PARK JOB NUMBER: ? DESIGN ENGINEER: BC BASIN DESIGNATION = TOTAL SITE DETERMINE EXISTING Q FOR 2 YEAR STORM HISTORIC RUNOFF COEFFICIENT .2 BASIN SLOPE: 1.5 PERCENT BASIN LENGTH 500 FEET AREA: 4.01 ACRES HIST TC = 1.87*(1.1-( 1 * .2 )>*SQRROOT 500 >)/ 1.5 ^ 1/ = 32.87992 MINUTES HISTORIC RAINFALL INTENSITY: 1.421601 INCHES/HOUR HISTORIC OUTFALL: 1.140174"' CUBIC FEET PER SECOND DETERMINATION OF DETENTION POND VOLUME FOR DEVELOPED CONDITIONS DEVELOPED STORM: 100 YEAR STORM DEVELOPED RUNOFF COEFFICIENT .67 CCFAC = .67 * 1.25 = 3.358375 DURATION GROSS VOL. OUTFLOW VOL. MIN CU. FT. CU. FT. 5 9188.514 342.0372 10 14145.48 684.0745 15 18014.32 1026.112 30 24905.71 2052.223 45 29923.12 3078.335 60 31555.29 4104,447 90 34094.22 6156.67 120 34819.63 8208.894 180 37721.27 12313.34 360 42073.73 24626.68 REQUIRED DETENTION VOLUME IS 27937.55 '641358 ACRE FEET w''' * DETENTION VOL. CU. FT 8846.478 13461.4 16988.21 22853.49 26844.79 27450.85 27937.55 26610.74 25407.93 17447.04 CU. FT. OR omm