Bowling Green, OH rainwater: 29,972 gallons off a roof
Rainwater from a roof in Bowling Green, OH
29,972gallons a year
That is a 1,500 sq ft asphalt roof under Bowling Green, OH's normal 37.7 inches of rain, about 795 gallons for every inch that falls.
In Bowling Green, 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 Bowling Green 1.7 Wnw station (1.6 mi away). Bowling Green, OH ranks 154th wettest of the 176 cities covered in Ohio.
Month by month in Bowling Green
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.62 | 2,082 | |
| Feb | 2.18 | 1,733 | |
| Mar | 2.70 | 2,146 | |
| Apr | 3.70 | 2,941 | 81 |
| May | 4.29 | 3,410 | 7 |
| Jun | 3.91 | 3,108 | 55 |
| Jul | 3.64 | 2,893 | 89 |
| Aug | 3.70 | 2,941 | 81 |
| Sep | 3.06 | 2,432 | 161 |
| Oct | 2.74 | 2,178 | 201 |
| Nov | 2.79 | 2,218 | |
| Dec | 2.38 | 1,892 |
May is the wettest month (4.29 in, 3,410 gal off the roof); Feb the driest (2.18 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 Bowling Green?
Best fit: one 55-gallon barrel, which delivers about 531 gallons to the garden in a normal year (78.7% of its need).
If you buy one, a 55-gallon barrel with a downspout diverter is the whole job. Check that the overflow points away from your foundation, because most of Bowling Green's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 531 | 28,286 |
| 110 gal | 531 | 28,286 |
| 165 gal | 531 | 28,286 |
| 275 gal | 531 | 28,286 |
| 550 gal | 531 | 28,286 |
| 1,000 gal | 531 | 28,286 |
| 1,500 gal | 531 | 28,286 |
| 2,500 gal | 531 | 28,286 |
| 5,000 gal | 531 | 28,286 |
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