Danville, IN rainwater: 34,884 gallons off a roof
Rainwater from a roof in Danville, IN
34,884gallons a year
That is a 1,500 sq ft asphalt roof under Danville, IN's normal 43.9 inches of rain, about 795 gallons for every inch that falls.
In Danville, 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 Danville 3 Sw station (2.7 mi away). Danville, IN ranks 36th wettest of the 88 cities covered in Indiana.
Month by month in Danville
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 3.14 | 2,496 | |
| Feb | 2.46 | 1,955 | |
| Mar | 3.10 | 2,464 | |
| Apr | 4.24 | 3,370 | 14 |
| May | 4.53 | 3,600 | |
| Jun | 5.65 | 4,491 | |
| Jul | 4.45 | 3,537 | |
| Aug | 3.32 | 2,639 | 128 |
| Sep | 3.52 | 2,798 | 103 |
| Oct | 3.44 | 2,734 | 113 |
| Nov | 3.18 | 2,527 | |
| Dec | 2.86 | 2,273 |
Jun is the wettest month (5.65 in, 4,491 gal off the roof); Feb the driest (2.46 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 Danville?
Best fit: one 55-gallon barrel, which delivers about 292 gallons to the garden in a normal year (81.3% 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 Danville's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 292 | 33,437 |
| 110 gal | 292 | 33,437 |
| 165 gal | 292 | 33,437 |
| 275 gal | 292 | 33,437 |
| 550 gal | 292 | 33,437 |
| 1,000 gal | 292 | 33,437 |
| 1,500 gal | 292 | 33,437 |
| 2,500 gal | 292 | 33,437 |
| 5,000 gal | 292 | 33,437 |
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