Greensburg, IN rainwater: 37,364 gallons off a roof
Rainwater from a roof in Greensburg, IN
37,364gallons a year
That is a 1,500 sq ft asphalt roof under Greensburg, IN's normal 47.0 inches of rain, about 795 gallons for every inch that falls.
In Greensburg, 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 Greensburg station (0.7 mi away). Greensburg, IN ranks 15th wettest of the 88 cities covered in Indiana.
Month by month in Greensburg
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 3.40 | 2,702 | |
| Feb | 2.76 | 2,194 | |
| Mar | 3.77 | 2,996 | |
| Apr | 4.91 | 3,902 | |
| May | 5.08 | 4,038 | |
| Jun | 5.41 | 4,300 | |
| Jul | 3.97 | 3,155 | 47 |
| Aug | 4.03 | 3,203 | 40 |
| Sep | 3.24 | 2,575 | 138 |
| Oct | 3.37 | 2,678 | 122 |
| Nov | 3.60 | 2,861 | |
| Dec | 3.47 | 2,758 |
Jun is the wettest month (5.41 in, 4,300 gal off the roof); Feb the driest (2.76 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 Greensburg
Best fit: one 55-gallon barrel, which delivers about 278 gallons to the garden in a normal year (79.9% of its need).
Before you buy, a 55-gallon barrel with a downspout diverter is the whole job. Check that the overflow points away from your foundation, because most of Greensburg's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 278 | 35,796 |
| 110 gal | 278 | 35,796 |
| 165 gal | 278 | 35,796 |
| 275 gal | 278 | 35,796 |
| 550 gal | 278 | 35,796 |
| 1,000 gal | 278 | 35,796 |
| 1,500 gal | 278 | 35,796 |
| 2,500 gal | 278 | 35,796 |
| 5,000 gal | 278 | 35,796 |
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