Brooklyn, OH rainwater: 33,263 gallons off a roof
How much rain a roof in Brooklyn, OH collects
33,263gallons a year
That is a 1,500 sq ft asphalt roof under Brooklyn, OH's normal 41.9 inches of rain, about 795 gallons for every inch that falls.
In Brooklyn, 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 Parma 1.9 Nnw station (1.8 mi away). Brooklyn, OH ranks 94th wettest of the 176 cities covered in Ohio.
Month by month in Brooklyn
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.91 | 2,313 | |
| Feb | 2.48 | 1,971 | |
| Mar | 2.99 | 2,376 | |
| Apr | 3.71 | 2,949 | 80 |
| May | 4.15 | 3,298 | 25 |
| Jun | 3.71 | 2,949 | 80 |
| Jul | 4.17 | 3,314 | 22 |
| Aug | 3.96 | 3,147 | 49 |
| Sep | 3.80 | 3,020 | 69 |
| Oct | 3.71 | 2,949 | 80 |
| Nov | 3.17 | 2,520 | |
| Dec | 3.09 | 2,456 |
Jul is the wettest month (4.17 in, 3,314 gal off the roof); Feb the driest (2.48 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 Brooklyn?
Best fit: one 55-gallon barrel, which delivers about 290 gallons to the garden in a normal year (71.8% 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 Brooklyn's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 290 | 31,472 |
| 110 gal | 290 | 31,472 |
| 165 gal | 290 | 31,472 |
| 275 gal | 290 | 31,472 |
| 550 gal | 290 | 31,472 |
| 1,000 gal | 290 | 31,472 |
| 1,500 gal | 290 | 31,472 |
| 2,500 gal | 290 | 31,472 |
| 5,000 gal | 290 | 31,472 |
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