Warsaw, IN rainwater: 32,221 gallons off a roof
Rainwater from a roof in Warsaw, IN
32,221gallons a year
That is a 1,500 sq ft asphalt roof under Warsaw, IN's normal 40.5 inches of rain, about 795 gallons for every inch that falls.
In Warsaw, 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 Warsaw station (1.6 mi away). Warsaw, IN ranks 68th wettest of the 88 cities covered in Indiana.
Month by month in Warsaw
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.59 | 2,059 | |
| Feb | 1.98 | 1,574 | |
| Mar | 2.16 | 1,717 | |
| Apr | 4.05 | 3,219 | 37 |
| May | 4.89 | 3,887 | |
| Jun | 4.72 | 3,751 | |
| Jul | 4.41 | 3,505 | |
| Aug | 4.52 | 3,593 | |
| Sep | 2.90 | 2,305 | 181 |
| Oct | 3.17 | 2,520 | 147 |
| Nov | 2.71 | 2,154 | |
| Dec | 2.44 | 1,939 |
May is the wettest month (4.89 in, 3,887 gal off the roof); Feb the driest (1.98 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 Warsaw
Best fit: one 55-gallon barrel, which delivers about 286 gallons to the garden in a normal year (78.3% 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 Warsaw's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 286 | 30,735 |
| 110 gal | 286 | 30,735 |
| 165 gal | 286 | 30,735 |
| 275 gal | 286 | 30,735 |
| 550 gal | 286 | 30,735 |
| 1,000 gal | 286 | 30,735 |
| 1,500 gal | 286 | 30,735 |
| 2,500 gal | 286 | 30,735 |
| 5,000 gal | 286 | 30,735 |
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