Brownsburg, IN rainwater: 35,957 gallons off a roof
Rainwater from a roof in Brownsburg, IN
35,957gallons a year
That is a 1,500 sq ft asphalt roof under Brownsburg, IN's normal 45.2 inches of rain, about 795 gallons for every inch that falls.
In Brownsburg, 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 Avon 1.6 Nnw station (3.5 mi away). Brownsburg, IN ranks 23rd wettest of the 88 cities covered in Indiana.
Month by month in Brownsburg
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 3.22 | 2,559 | |
| Feb | 2.53 | 2,011 | |
| Mar | 3.72 | 2,957 | |
| Apr | 4.41 | 3,505 | |
| May | 4.57 | 3,632 | |
| Jun | 5.37 | 4,268 | |
| Jul | 4.71 | 3,744 | |
| Aug | 3.45 | 2,742 | 112 |
| Sep | 3.43 | 2,726 | 115 |
| Oct | 3.37 | 2,678 | 122 |
| Nov | 3.46 | 2,750 | |
| Dec | 3.00 | 2,384 |
Jun is the wettest month (5.37 in, 4,268 gal off the roof); Feb the driest (2.53 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 Brownsburg
Best fit: one 55-gallon barrel, which delivers about 288 gallons to the garden in a normal year (82.5% 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 Brownsburg's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 288 | 34,499 |
| 110 gal | 288 | 34,499 |
| 165 gal | 288 | 34,499 |
| 275 gal | 288 | 34,499 |
| 550 gal | 288 | 34,499 |
| 1,000 gal | 288 | 34,499 |
| 1,500 gal | 288 | 34,499 |
| 2,500 gal | 288 | 34,499 |
| 5,000 gal | 288 | 34,499 |
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