Crawfordsville, IN rainwater: 35,099 gallons off a roof
How much rain a roof in Crawfordsville, IN collects
35,099gallons a year
That is a 1,500 sq ft asphalt roof under Crawfordsville, IN's normal 44.2 inches of rain, about 795 gallons for every inch that falls.
In Crawfordsville, 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 Crawfordsville 6 Se station (5.8 mi away). Crawfordsville, IN ranks 34th wettest of the 88 cities covered in Indiana.
Month by month in Crawfordsville
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.87 | 2,281 | |
| Feb | 2.51 | 1,995 | |
| Mar | 3.15 | 2,504 | |
| Apr | 4.41 | 3,505 | |
| May | 4.53 | 3,600 | |
| Jun | 5.26 | 4,181 | |
| Jul | 4.42 | 3,513 | |
| Aug | 3.86 | 3,068 | 61 |
| Sep | 3.24 | 2,575 | 138 |
| Oct | 3.39 | 2,694 | 120 |
| Nov | 3.64 | 2,893 | |
| Dec | 2.88 | 2,289 |
Jun is the wettest month (5.26 in, 4,181 gal off the roof); Feb the driest (2.51 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 Crawfordsville?
Best fit: one 55-gallon barrel, which delivers about 261 gallons to the garden in a normal year (81.8% 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 Crawfordsville's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 261 | 33,667 |
| 110 gal | 261 | 33,667 |
| 165 gal | 261 | 33,667 |
| 275 gal | 261 | 33,667 |
| 550 gal | 261 | 33,667 |
| 1,000 gal | 261 | 33,667 |
| 1,500 gal | 261 | 33,667 |
| 2,500 gal | 261 | 33,667 |
| 5,000 gal | 261 | 33,667 |
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