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# Swale drawings

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Roof calculations as well as parking lot calculations, corn and soy field calculations,

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### Swale drawings

1. 10. Find the catchment area length ft x width ft= catchment area ft2 length m x width m= catchment area m2 60 ft 18.3 m 57 ft 17.4 m 46 ft 14 m 22 ft 6.7 m
2. 11. 60 ft 18.3 m 22 ft 6.7 m 60 ft x 22 ft= 1320 ft2 18.3 m x 6.7 m= 122.6 m2 Find the catchment area
3. 12. 35 ft 10.7 m 46 ft 14 m 35 ft x 46 ft= 1610 ft2 10.7 m x 14 m= 149.8 m2 Find the catchment area
4. 13. 60 ft 18.3 m 57 ft 17.4 m 46 ft 14 m 22 ft 6.7 m 1320 ft2 + 1610 ft2 = 2930 ft2 122.6 m2 + 149.8 m2 = 272.4 m2 Find the catchment area
5. 14. Possible Volume from Runoff Catchment area ft2 x rainfall ft x 7.48 gal/ft3 = maximum runoff in gal Catchment area m2 x rainfall mm = maximum runoff in liters
6. 15. Volume from Runoff 1320 ft2 x 3.58 ft x 7.48 gal/ft3= 35347.49 gal 122.6 m2 x 1092 mm= 133879.2 l Possible Volume from Runoff Catchment area ft2 x rainfall ft x 7.48 gal/ft3 = maximum runoff in gal Catchment area m2 x rainfall mm = maximum runoff in liters Avg. rainfall in Cincinnati = 43 in 43 in- = 3.58 ft 43 in = 1.092 m 1 ft = .3048 m 22 ft 6.7 m catchment area 60 ft x 22 ft= 1320 ft2 18.3 m x 6.7 m= 122.6 m2 60 ft 18.3 m
7. 16. Volume from Runoff 35 ft 10.7 m 46 ft 14 m catchment area 35 ft x 46 ft= 1610 ft2 10.7 m x 14 m= 149.8 m2 1610 ft2 x 3.58 ft x 7.48 gal/ft3= 43113.2 gal 149.8 m2 x 1092 mm= 163581.6 L
8. 17. 60 ft 18.3 m 57 ft 17.4 m 46 ft 14 m 22 ft 6.7 m catchment area 1320 ft2 + 1610 ft2 = 2930 ft2 122.6 m2 + 149.8 m2 = 272.4 m2 Volume from Runoff 35347.49 gal + 43113.2 gal = 78460.7 gal 133879.2 l + 163581.6 l= 297460.8 l
9. 18. Estimated Net Runoff from a Catchment Surface Adjusted by its Runoff Coefficient catchment area (ft2) x rainfall (ft) x 7.48 gal/ft x runoff coefficient = net runoff (gal) 60 ft 18.3 m 57 ft 17.4 m 46 ft 14 m 22 ft 6.7 m 297460.8 l x .9 = 267714.7 l Sample runoff coefficient Metal roofs lose 5% thus coefficient 95% Concrete & Asphalt 90% Built up tar and gravel roofs 80-85% Clay tile roof?? 78460.7 gal x .9= 70614.63 gal
10. 19. 60 ft 18 m 22 ft 6.6 m 35 ft 10.5 m 46 ft 13.8 m 60 ft 18 m 57 ft 17.1 m 46 ft 13.8 m 22 ft 6.6 m
11. 20. 3-5 ft or 1-1.5 m 1-3 ft or .3- 1 m
12. 21. Calculating water holding capacity of the swale Area = ½ x width x depth (formula for a triangle) Volume of Water Holding Capacity= Area x length Volume = ½ x width x depth x length width-= 5 ft or 1.5 m Depth = 3 ft or .9 m Length= 90 ft or 30 m
13. 22. Calculating water holding capacity of the swale Volume = ½ x width x depth x length .5 x 5ft x 3ft x 90ft = 675 ft3 675 ft 3 x 7.48 gal/ft3 = 5,049 gal .5 x 1.5m x .9m x 30m = 20.25 m3 20.25 m3 x 1,000 liters/m= 20,250 l width-= 5 ft or 1.5 m Depth = 3 ft or .9 m
14. 23. Estimated Net Runoff from a Catchment Surface Adjusted by its Runoff Coefficient catchment area (ft2) x rainfall (ft) x 7.48 gal/ft x runoff coefficient = net runoff (gal) 60 ft 18 m 57 ft 17.1 m 46 ft 13.8 m 22 ft 6.6 m
15. 24. Estimated Net Runoff from a Catchment Surface Adjusted by its Runoff Coefficient catchment area (ft2) x rainfall (ft) x 7.48 gal/ft x runoff coefficient = net runoff (gal) 60 ft 18 m 57 ft 17.1 m 46 ft 13.8 m 22 ft 6.6 m Volume from Runoff 1320 ft2 x .083 ft x 7.48 gal/ft3= 819.5 gal 1610 ft2 x .083 ft x 7.48 gal/ft3= 999.55 gal Total=1819.05 gal
16. 26. Walmart parking Lot -17 acres Runoff?
17. 27. Walmart parking Lot -17 acres Runoff=16,370,116 x .083 ft x 7.48=10,163,222.8 gal
18. 28. Corn and Soy-23,500,000 acres State of Iowa- 35,922,000 acres Runoff=168,885,558,744 x .083 ft x 7.48=126,323,979,405 gal
19. 29. Corn and Soy-23,500,000 acres State of Iowa- 35,922,000 acres Runoff=168,885,558,744 x .083 ft x 7.48=104,850,910,290 gal X .65=68,153,091,688 104,850,910,290 gal X .2=136,306,183,377 136,306,183,377-68,153,091,688=68153091689 gal