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HomeMy WebLinkAboutCENTRE FOR ADVANCED TECHNOLOGY 2ND FILING~ ~ 0 0 DATE: 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 DEVELOPED RUNOFF COEFFICIENT CCFAC = .67 * = 3.358375 DURATION GROSS VOL. MIN CU. FT. 5 9188,514 10 14145.48 15 18014.32 30 24905.71 45 29923.12 60 31555.29 90 34094.22 120 34819.63 180 37721.27 360 42073.73 REQUIRED DETENTION V L IS .641358 ACRE FEET YEAR STORM .67 1.25 OUTFLOW VOL. CU. FT. 342.0372 684.0745 1026.112 2052.223 3078'335 4104.447 6156.67 8208,894 12313.34 24626.68 27937.55 * DETENTION VOL. CU. FT B846.478 13461.4 16988.21 22853.49 26844.79 27450.85 27937.55 26610'74 25407.93 17447.04 CU. FT. OR 4.(