Canal Winchester, OH rainwater: 34,320 gallons off a roof
Rainwater from a roof in Canal Winchester, OH
34,320gallons a year
That is a 1,500 sq ft asphalt roof under Canal Winchester, OH's normal 43.2 inches of rain, about 795 gallons for every inch that falls.
In Canal Winchester, 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 Columbus-Valley Crossing station (6.6 mi away). Canal Winchester, OH ranks 52nd wettest of the 176 cities covered in Ohio.
Month by month in Canal Winchester
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 3.41 | 2,710 | |
| Feb | 2.63 | 2,090 | |
| Mar | 3.87 | 3,076 | |
| Apr | 4.03 | 3,203 | 40 |
| May | 4.39 | 3,489 | |
| Jun | 3.92 | 3,116 | 54 |
| Jul | 4.60 | 3,656 | |
| Aug | 3.56 | 2,830 | 98 |
| Sep | 3.56 | 2,830 | 98 |
| Oct | 2.87 | 2,281 | 185 |
| Nov | 2.99 | 2,376 | |
| Dec | 3.35 | 2,663 |
Jul is the wettest month (4.60 in, 3,656 gal off the roof); Feb the driest (2.63 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
What size rain barrel for Canal Winchester
Best fit: one 55-gallon barrel, which delivers about 383 gallons to the garden in a normal year (80.6% 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 Canal Winchester's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 383 | 32,751 |
| 110 gal | 383 | 32,751 |
| 165 gal | 383 | 32,751 |
| 275 gal | 383 | 32,751 |
| 550 gal | 383 | 32,751 |
| 1,000 gal | 383 | 32,751 |
| 1,500 gal | 383 | 32,751 |
| 2,500 gal | 383 | 32,751 |
| 5,000 gal | 383 | 32,751 |
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