Zanesville, OH rainwater: 30,656 gallons off a roof
Zanesville, OH: gallons off the roof each year
30,656gallons a year
That is a 1,500 sq ft asphalt roof under Zanesville, OH's normal 38.6 inches of rain, about 795 gallons for every inch that falls.
In Zanesville, 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 Zanesville Muni Ap station (6.4 mi away). Zanesville, OH ranks 151st wettest of the 176 cities covered in Ohio.
Month by month in Zanesville
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.80 | 2,225 | |
| Feb | 2.31 | 1,836 | |
| Mar | 3.24 | 2,575 | |
| Apr | 3.86 | 3,068 | 61 |
| May | 3.79 | 3,012 | 70 |
| Jun | 4.29 | 3,410 | 7 |
| Jul | 3.73 | 2,965 | 77 |
| Aug | 3.20 | 2,543 | 143 |
| Sep | 3.12 | 2,480 | 153 |
| Oct | 2.81 | 2,233 | 192 |
| Nov | 2.79 | 2,218 | |
| Dec | 2.63 | 2,090 |
Jun is the wettest month (4.29 in, 3,410 gal off the roof); Feb the driest (2.31 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 Zanesville
Best fit: one 55-gallon barrel, which delivers about 560 gallons to the garden in a normal year (79.5% 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 Zanesville's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 560 | 28,910 |
| 110 gal | 560 | 28,910 |
| 165 gal | 560 | 28,910 |
| 275 gal | 560 | 28,910 |
| 550 gal | 560 | 28,910 |
| 1,000 gal | 560 | 28,910 |
| 1,500 gal | 560 | 28,910 |
| 2,500 gal | 560 | 28,910 |
| 5,000 gal | 560 | 28,910 |
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