West Carrollton, OH rainwater: 32,563 gallons off a roof
How much rain a roof in West Carrollton, OH collects
32,563gallons a year
That is a 1,500 sq ft asphalt roof under West Carrollton, OH's normal 41.0 inches of rain, about 795 gallons for every inch that falls.
In West Carrollton, OH 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 Dayton Wright Bros Ap station (5.5 mi away). West Carrollton, OH ranks 129th wettest of the 176 cities covered in Ohio.
Month by month in West Carrollton
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.91 | 2,313 | |
| Feb | 2.33 | 1,852 | |
| Mar | 3.48 | 2,766 | |
| Apr | 4.37 | 3,473 | |
| May | 4.21 | 3,346 | 17 |
| Jun | 4.90 | 3,895 | |
| Jul | 3.63 | 2,885 | 90 |
| Aug | 2.81 | 2,233 | 192 |
| Sep | 2.97 | 2,361 | 172 |
| Oct | 3.02 | 2,400 | 166 |
| Nov | 3.13 | 2,488 | |
| Dec | 3.21 | 2,551 |
Jun is the wettest month (4.90 in, 3,895 gal off the roof); Feb the driest (2.33 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 West Carrollton?
Best fit: one 55-gallon barrel, which delivers about 520 gallons to the garden in a normal year (81.6% 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 West Carrollton's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 520 | 30,828 |
| 110 gal | 520 | 30,828 |
| 165 gal | 520 | 30,828 |
| 275 gal | 520 | 30,828 |
| 550 gal | 520 | 30,828 |
| 1,000 gal | 520 | 30,828 |
| 1,500 gal | 520 | 30,828 |
| 2,500 gal | 520 | 30,828 |
| 5,000 gal | 520 | 30,828 |
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 Ohio?
Legal. Ohio regulates rainwater cisterns used as a drinking-water source as private water systems (OAC chapter 3701-28): local health department permit, continuous disinfection and filtration. No state rule restricting non-potable collection or storage size.
Checked against the current source on 2026-11-06. Source