Rainwater Catchment Calculator
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Rainwater Catchment Calculator
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This is a simple sheet that allows the user to calculate the amount of rainfall that can potentially be collected from an impervious surface such as a roof or asphault parking lot
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Plug in the area of the impervious surface in the green cells to determine how much rainfall could be collected each year
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Green cells can be edited, organge cells should not be edited or done so carefully so as not to mess up the calculations
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The worksheet can also help calculate the sizing of a tank. Insert the tank size in gallons and in the Rainfall Collected table insert estimated water used per month
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GENERAL CALCULATIONS
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1. Take the dimensions of the footprint of your roof and convert them to inches. (So, a 50' x 20' roof is 600" x 240".)
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2. Multiply the roof dimensions by the number of inches of rainfall. ...
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3. Divide by 231 to get the number of gallons (because 1 gallon = 231 cubic inches).
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DIMENSIONS
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BarnFeetInches
Tank Size (gallons)
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length546482500
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width32384
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1,728 248,832
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High Tunnel
FeetInches
Tank Size (gallons)
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length961152
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width30360
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2,880 414,720
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WEATHER DATA
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JanFebMarAprMayJunJulAugSepOctNovDec
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Average high in °F:333747607079828174635037
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Average low in °F:151825364656595648372920
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Av. precipitation in inch:2.832.43.153.584.414.254.173.393.312.83.232.99
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Days with precipitation:------------
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Hours of sunshine:------------
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https://www.usclimatedata.com/climate/mount-vernon/ohio/united-states/usoh1887
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RAINFALL COLLECTED
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JanFebMarAprMayJunJulAugSepOctNovDec
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BarnSquare inches collected 704,194.56 597,196.80 783,820.80 890,818.56 1,097,349.12 1,057,536.00 1,037,629.44 843,540.48 823,633.92 696,729.60 803,727.36 744,007.68
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Gallons per month 3,048.46 2,585.27 3,393.16 3,856.36 4,750.43 4,578.08 4,491.90 3,651.69 3,565.51 3,016.15 3,479.34 3,220.81
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Cumulative gallons 3,048.46 5,633.73 9,026.89 12,883.25 17,633.68 22,211.76 26,703.66 30,355.35 33,920.86 36,937.01 40,416.35 43,637.16
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Gallons in tank 2,500.00 2,500.00 2,500.00 2,500.00 2,500.00 2,500.00 2,500.00 2,500.00 2,500.00 2,116.15 2,500.00 2,500.00
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Gallons Used - - 500.00 1,000.00 1,000.00 1,000.00 2,500.00 2,500.00 3,400.00 2,000.00 2,000.00 -
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Gallons Remaining 2,500.00 2,500.00 2,000.00 1,500.00 1,500.00 1,500.00 - - (900.00) 116.15 500.00 2,500.00
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High Tunnel
Square inches collected 1,173,657.60 995,328.00 1,306,368.00 1,484,697.60 1,828,915.20 1,762,560.00 1,729,382.40 1,405,900.80 1,372,723.20 1,161,216.00 1,339,545.60 1,240,012.80
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Gallons per month of rainfall 5,080.77 4,308.78 5,655.27 6,427.26 7,917.38 7,630.13 7,486.50 6,086.15 5,942.52 5,026.91 5,798.90 5,368.02
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Cumulative gallons 5,080.77 9,389.55 15,044.82 21,472.08 29,389.46 37,019.59 44,506.10 50,592.25 56,534.77 61,561.68 67,360.58 72,728.60
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Gallons collected 2,500.00 2,500.00 2,500.00 2,500.00 2,500.00 2,500.00 2,500.00 2,500.00 2,500.00 2,500.00 2,500.00 2,500.00
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Gallons Used 2,000.00 2,000.00 2,000.00 2,000.00 2,000.00 2,000.00 2,000.00 2,000.00 2,000.00 2,000.00 2,000.00 2,000.00
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Gallons Remaining 500.00 500.00 500.00 500.00 500.00 500.00 500.00 500.00 500.00 500.00 500.00 500.00
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