Greenfield, IN rainwater: 37,968 gallons off a roof
Greenfield, IN: gallons off the roof each year
37,968gallons a year
That is a 1,500 sq ft asphalt roof under Greenfield, IN's normal 47.8 inches of rain, about 795 gallons for every inch that falls.
In Greenfield, IN a single barrel does most of the work. Storms come often enough that a small tank refills before it runs dry, and a bigger one would mostly sit full.
Rainfall: NOAA 1991-2020 climate normals, the Greenfield station (0.8 mi away). Greenfield, IN ranks 11th wettest of the 88 cities covered in Indiana.
Month by month in Greenfield
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 3.29 | 2,615 | |
| Feb | 2.58 | 2,051 | |
| Mar | 3.65 | 2,901 | |
| Apr | 4.72 | 3,751 | |
| May | 5.29 | 4,205 | |
| Jun | 5.69 | 4,522 | |
| Jul | 4.75 | 3,775 | |
| Aug | 3.73 | 2,965 | 77 |
| Sep | 3.71 | 2,949 | 80 |
| Oct | 3.47 | 2,758 | 110 |
| Nov | 3.67 | 2,917 | |
| Dec | 3.22 | 2,559 |
Jun is the wettest month (5.69 in, 4,522 gal off the roof); Feb the driest (2.58 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
What size rain barrel for Greenfield
Best fit: one 55-gallon barrel, which delivers about 215 gallons to the garden in a normal year (80.6% of its need).
If you set one up, a 55-gallon barrel with a downspout diverter is the whole job. Check that the overflow points away from your foundation, because most of Greenfield's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 215 | 36,463 |
| 110 gal | 215 | 36,463 |
| 165 gal | 215 | 36,463 |
| 275 gal | 215 | 36,463 |
| 550 gal | 215 | 36,463 |
| 1,000 gal | 215 | 36,463 |
| 1,500 gal | 215 | 36,463 |
| 2,500 gal | 215 | 36,463 |
| 5,000 gal | 215 | 36,463 |
Simulated storm by storm through a normal year using the station's count of days with 0.1 in or more of rain each month.
Is rainwater collection legal in Indiana?
No statewide rainwater harvesting regulations; check county for local incentives
From the 2015 (Pacific Northwest National Laboratory report 24347); not yet re-checked against current law, so check with your state water agency before building anything large. Source