Dover, OH rainwater: 33,493 gallons off a roof
How much rain a roof in Dover, OH collects
33,493gallons a year
That is a 1,500 sq ft asphalt roof under Dover, OH's normal 42.1 inches of rain, about 795 gallons for every inch that falls.
In Dover, 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 New Philadelphia station (3.9 mi away). Dover, OH ranks 83rd wettest of the 176 cities covered in Ohio.
Month by month in Dover
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 3.16 | 2,512 | |
| Feb | 2.46 | 1,955 | |
| Mar | 3.26 | 2,591 | |
| Apr | 3.69 | 2,933 | 82 |
| May | 4.21 | 3,346 | 17 |
| Jun | 4.77 | 3,791 | |
| Jul | 3.90 | 3,100 | 56 |
| Aug | 3.87 | 3,076 | 60 |
| Sep | 3.41 | 2,710 | 117 |
| Oct | 3.22 | 2,559 | 141 |
| Nov | 2.80 | 2,225 | |
| Dec | 3.39 | 2,694 |
Jun is the wettest month (4.77 in, 3,791 gal off the roof); Feb the driest (2.46 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
Which tank size is worth it in Dover
Best fit: one 55-gallon barrel, which delivers about 371 gallons to the garden in a normal year (78.3% 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 Dover's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 371 | 31,832 |
| 110 gal | 371 | 31,832 |
| 165 gal | 371 | 31,832 |
| 275 gal | 371 | 31,832 |
| 550 gal | 371 | 31,832 |
| 1,000 gal | 371 | 31,832 |
| 1,500 gal | 371 | 31,832 |
| 2,500 gal | 371 | 31,832 |
| 5,000 gal | 371 | 31,832 |
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