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Home My WebLink AboutSTORM DRAINAGE CALCS - 20-00412 - 425 Harvard Ave - Blake Willis - Duplex Bldg 2Kaman Properties 425 Harvard Avenue Blake Willis Storm Water or surface water drainage plan Description of Area B1 1001/1101 driveway sidewalk B2 2001/2101 driveway sidewalk B3 3001/3101 driveway sidewalk B4 4001/4101 driveway sidewalk Cul de sac with sidwalk B1 West roof Total Hard surface area to NW corner cubic feet of runoff 0.9 * 0.9/12 *SA Green lawn area South of B1 Green lawn area West of B1 Green lawn area West of B3 Total Green area draining to NW cubic feet of runoff 0.2 * 0.9/12 *SA NW basin storage capacity 1/2 * 22' width * 1.5 High 50' L Green lawn area North of B4 Green lawn area West of B4 Green lawn area South of B4 Total Green area draining to SW cubic feet of runoff 0.2 * 0.9/12 *SA SW basin storage capacity 1/2 * 22' width * 1.5 High 60' L B1 Living area roof SA B1 Garage roof SA Total SA draining to North B1 cubic feet of runoff 0.9 * 0.9/12 *SA North basin storage capacity 1/2 * 22' width * 1.5 High 50' L B2 Living area roof SA B2 Garage roof SA Total SA draining to NorthEast B2 cubic feet of runoff 0.9 * 0.9/12 *SA North East basin storage capacity 1/2 * 22' width * 1.5 High 50' L B3 Living area roof SA B3 Garage roof SA Total SA draining to East B3 cubic feet of runoff 0.9 * 0.9/12 *SA East basin storage capacity 1/2 * 22' width * 1.5 High 50' L B4 Living area roof SA B4 Garage roof SA Total SA draining to South East B4 cubic feet of runoff 0.9 * 0.9/12 *SA South East basin storage capacity 1/2 * 22' width * 1.5 High 50' L Green Area Behind or East of B2 Total Area of Building Lot 8/10 of acre Total Hard Surface area Green Surface area Total Hard SA storage needed Total Green and Hard SA storage capacity Total Green SA storage needed Total Green and Hard SA storage capacity length 30 30 30 30 32 0.9 32 26 20 0.2 22 32 26 24 0.2 22 18 28 0.9 20 20 18 28 0.9 40 40 18 28 0.9 30 30 18 28 0.9 20 20 40 34848 0.9 0.2 width 30 40 25 25 18 0.075 30 80 20 0.075 50 30 80 108 0.075 60 32 26 0.075 56 56 32 26 0.075 75 75 32 26 0.075 60 60 32 26 0.075 30 30 80 12392 0.075 0.075 total surface area 900 1200 750 750 3000 576 7176 484.38 960 2080 400 3440 51.6 825 960 2080 2592 5632 84.48 990 576 728 1304 88.02 840 576 728 1304 88.02 2250 576 728 1304 88.02 1350 576 728 1304 88.02 450 3200 34848 12392 22456 836.46 6705 336.84 6705 Sq ft Surface Area Cubic Feet Sq ft Surface Area Cubic Feet Cubic Feet storage Sq ft Surface Area Cubic Feet Cubic Feet storage Sq ft Surface Area Cubic Feet Cubic Feet storage Sq ft Surface Area Cubic Feet Cubic Feet storage Sq ft Surface Area Cubic Feet Cubic Feet storage Sq ft Surface Area Cubic Feet Cubic Feet storage Sq ft Surface Area Sq ft Surface Area Sq ft Surface Area Cubic Feet Cubic Feet Capacity Cubic Feet Cubic Feet Capacity