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)
Where
V =
volume of water in gallons,
A² = surface area of roof in square feet,
R = rainfall in feet
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
http://www.rssweather.com/climate/Iowa/Des%20Moines/
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