Vincennes, IN rainwater: 37,817 gallons off a roof
How much rain a roof in Vincennes, IN collects
37,817gallons a year
That is a 1,500 sq ft asphalt roof under Vincennes, IN's normal 47.6 inches of rain, about 795 gallons for every inch that falls.
In Vincennes, 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 Vincennes 4 E station (2.5 mi away). Vincennes, IN ranks 12th wettest of the 88 cities covered in Indiana.
Month by month in Vincennes
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 3.45 | 2,742 | |
| Feb | 2.73 | 2,170 | |
| Mar | 3.83 | 3,044 | |
| Apr | 4.89 | 3,887 | |
| May | 5.40 | 4,292 | |
| Jun | 4.71 | 3,744 | |
| Jul | 4.42 | 3,513 | |
| Aug | 3.37 | 2,678 | 122 |
| Sep | 3.57 | 2,837 | 97 |
| Oct | 3.58 | 2,845 | 96 |
| Nov | 4.02 | 3,195 | |
| Dec | 3.61 | 2,869 |
May is the wettest month (5.40 in, 4,292 gal off the roof); Feb the driest (2.73 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
Barrel or cistern in Vincennes?
Best fit: one 55-gallon barrel, which delivers about 264 gallons to the garden in a normal year (83.7% 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 Vincennes's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 264 | 36,428 |
| 110 gal | 264 | 36,428 |
| 165 gal | 264 | 36,428 |
| 275 gal | 264 | 36,428 |
| 550 gal | 264 | 36,428 |
| 1,000 gal | 264 | 36,428 |
| 1,500 gal | 264 | 36,428 |
| 2,500 gal | 264 | 36,428 |
| 5,000 gal | 264 | 36,428 |
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