Acworth, GA rainwater: 43,158 gallons off a roof
Rainwater from a roof in Acworth, GA
43,158gallons a year
That is a 1,500 sq ft asphalt roof under Acworth, GA's normal 54.3 inches of rain, about 795 gallons for every inch that falls.
In Acworth, GA 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 Dallas 7 Ne station (6.0 mi away). Acworth, GA ranks 24th wettest of the 101 cities covered in Georgia.
Month by month in Acworth
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 4.90 | 3,895 | |
| Feb | 5.11 | 4,061 | |
| Mar | 5.14 | 4,085 | |
| Apr | 4.34 | 3,449 | 1 |
| May | 4.01 | 3,187 | 42 |
| Jun | 4.65 | 3,696 | |
| Jul | 4.75 | 3,775 | |
| Aug | 4.17 | 3,314 | 22 |
| Sep | 4.41 | 3,505 | |
| Oct | 3.40 | 2,702 | 118 |
| Nov | 4.42 | 3,513 | |
| Dec | 5.00 | 3,974 |
Mar is the wettest month (5.14 in, 4,085 gal off the roof); Oct the driest (3.40 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 Acworth
Best fit: one 55-gallon barrel, which delivers about 150 gallons to the garden in a normal year (81.3% 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 Acworth's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 150 | 41,732 |
| 110 gal | 150 | 41,732 |
| 165 gal | 150 | 41,732 |
| 275 gal | 150 | 41,732 |
| 550 gal | 150 | 41,732 |
| 1,000 gal | 150 | 41,732 |
| 1,500 gal | 150 | 41,732 |
| 2,500 gal | 150 | 41,732 |
| 5,000 gal | 150 | 41,732 |
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 Georgia?
Legal. Outdoor irrigation use is unrestricted; indoor non-potable systems must follow Appendix I 'Rainwater Recycling Systems' of the Georgia amendments to the state plumbing code. No state storage cap; potable use depends on local rules.
Checked against the current source on 2026-11-06. Source