Our Mission:

Our Mission: To enable individuals and communities to take an active part in the cultivation of systems that provide the highest quality fruits, vegetables, herbs and other yields, in a way that benefits themselves, cares for the land and environment, and provides a surplus to use, share and reinvest into the system.

Saturday, July 19, 2014

Rainfall/Rain Barrel Calculator

You can calculate the volume of water your barrel might collect using this simple formula:

V = A² x R x 0.90 x (7.5 gal./ft.³)

V = volume of water in gallons,
A² = surface area of roof in square feet,
R = rainfall in feet

The chart below provides some sample measurements for rough comparison purposes:

   House type
roof area (approx)
area / downspout (approx)
water volume / downspout (approx)
½" rain                    1" rain

2 BR frame
400 sq. ft
200 sq. ft.
   57 gallons 113 gallons
3 BR frame
460 sq. ft
230 sq. ft.
   65 gallons 129 gallons
2 BR masonry
520 sq. ft
260 sq. ft.
   73 gallons 146 gallons
3 BR masonry
560 sq. ft
280 sq. ft.
   79 gallons 158 gallons
larger townhomes
710 sq. ft
355 sq. ft.
   100 gallons 200 gallons
freestanding homes
800 sq. ft
200 sq. ft. (avg. 4 downspouts)
   57 gallons 113 gallons

Des Moines, IA
Average Rainfall for Des Moines, Iowa

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