Alliance, OH rainwater: 34,105 gallons off a roof
Rainwater from a roof in Alliance, OH
34,105gallons a year
That is a 1,500 sq ft asphalt roof under Alliance, OH's normal 42.9 inches of rain, about 795 gallons for every inch that falls.
In Alliance, 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 Louisville station (8.7 mi away). Alliance, OH ranks 60th wettest of the 176 cities covered in Ohio.
Month by month in Alliance
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.94 | 2,337 | |
| Feb | 2.49 | 1,979 | |
| Mar | 3.24 | 2,575 | |
| Apr | 3.70 | 2,941 | 81 |
| May | 4.66 | 3,704 | |
| Jun | 4.76 | 3,783 | |
| Jul | 4.68 | 3,720 | |
| Aug | 4.10 | 3,259 | 31 |
| Sep | 3.29 | 2,615 | 132 |
| Oct | 3.49 | 2,774 | 107 |
| Nov | 2.65 | 2,106 | |
| Dec | 2.91 | 2,313 |
Jun is the wettest month (4.76 in, 3,783 gal off the roof); Feb the driest (2.49 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 Alliance?
Best fit: one 55-gallon barrel, which delivers about 274 gallons to the garden in a normal year (77.9% 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 Alliance's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 274 | 32,586 |
| 110 gal | 274 | 32,586 |
| 165 gal | 274 | 32,586 |
| 275 gal | 274 | 32,586 |
| 550 gal | 274 | 32,586 |
| 1,000 gal | 274 | 32,586 |
| 1,500 gal | 274 | 32,586 |
| 2,500 gal | 274 | 32,586 |
| 5,000 gal | 274 | 32,586 |
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