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WPO200600050 Calculations 2008-07-16
Volume check by average end area Northtown Center Sed Basin 1 drainage area DA = 4.5 acres -------------------------------------------- req.volume Vr = 134(DA)/2 Vr = _301.500 cy Volumes provided derived from contour areas I Ell E12 d =E12 -Ell Areal Area2 Vcf= d(Areal +Area2) /2 total = total +Vcf 430 432 _2.0 3420 4380 _7800.00 Vcf E12 434 _2.0 Area2 5640 _10020.00 _17820.00 E12 436 _2.0 Area2 6880 _12520.00 _30340.00 E12 438 _2.0 Area2 8090 _14970.00 _45310.00 I - - _8.0 - - _45310.0 - Wet Volume provided Elo = 433 ft dewatering orifice invert, tubing Ell = 434 elevations above and below Elo E12 = 432 Vl = 17820 volume total at Ell V2 = 7800 volume total at E12 Vw = V1 +(Elo- Ell)(V2- V1) /(E12 -Ell) Vw = _12810.00 cf Vw /27 = 474.44 cy 100 *Vw /Vr /27 -100 = 57.36 percent oversized Basin storage must be a min 25% oversized Dry Volume provided Els = 435 ft spillway invert, or riser crest Ell = 436 elevations above and below Els E12 = 434 V1 = 30340 volume total at Ell V2 = 17820 volume total at E12 Vx = Vl +(Els- Ell)(V2- Vl) /(E12 -Ell) Vd = Vx -Vw Vd = _11270.00 cf Vd /27 = _417.41 cy 100 *Vd /Vr /27 -100 = 38.44 percent oversized Basin storage must be a min 25% oversized Volume check by average end area Northtown Center Sed Basin 2 drainage area DA = 12 acres ------------------------------------------ req.volume Vr = 134(DA)/2 Vr = _804.000 cy Volumes provided derived from contour areas Ell E12 d =E12 -Ell Areal Area2 Vcf= d(Areal +Area2) /2 total = total +Vcf 442 446 _4.0 21000 35000 _112000.00 Vcf E12 450 _4.0 Area2 51000 _172000.00 _284000.00 E12 452 _2.0 Area2 59000 _110000.00 _394000.00 - - _10.0 - - _394000.0 - Wet Volume provided Elo = 445 ft dewatering orifice invert, tubing Ell = 446 elevations above and below Elo E12 = 442 Vl = 112000 volume total at Ell V2 = 0 volume total at E12 Vw = Vl +(Elo- Ell)(V2- Vl) /(E12 -Ell) Vw = _84000.00 cf Vw /27 = _3111.11 cy 100 *Vw /Vr /27 -100 = 286.95 percent oversized Basin storage must be a min 25% oversized Dry Volume provided Els = 449 ft spillway invert, or riser crest Ell = 450 elevations above and below Els E12 = 446 V1 = 172000 volume total at Ell V2 = 112000 volume total at E12 Vx = Vl +(Els- Ell)(V2- Vl) /(E12 -Ell) Vd = Vx -Vw Vd = 73000.00 cf Vd /27 - _2703.70 cy 100 *Vd /Vr /27 -100 = _236.3 percent oversized Basin storage must be a min 25% oversized