Douglasville, GA rainwater: 41,568 gallons off a roof
Douglasville, GA: gallons off the roof each year
41,568gallons a year
That is a 1,500 sq ft asphalt roof under Douglasville, GA's normal 52.3 inches of rain, about 795 gallons for every inch that falls.
In Douglasville, 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 Douglasville 2.8 Ne station (3.1 mi away). Douglasville, GA ranks 58th wettest of the 101 cities covered in Georgia.
Month by month in Douglasville
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 4.65 | 3,696 | |
| Feb | 4.73 | 3,759 | |
| Mar | 4.61 | 3,664 | |
| Apr | 4.48 | 3,561 | |
| May | 3.52 | 2,798 | 103 |
| Jun | 4.52 | 3,593 | |
| Jul | 5.04 | 4,006 | |
| Aug | 4.20 | 3,338 | 19 |
| Sep | 4.25 | 3,378 | 12 |
| Oct | 3.53 | 2,806 | 102 |
| Nov | 4.21 | 3,346 | |
| Dec | 4.56 | 3,624 |
Jul is the wettest month (5.04 in, 4,006 gal off the roof); May the driest (3.52 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 Douglasville
Best fit: one 55-gallon barrel, which delivers about 191 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 Douglasville's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 191 | 40,133 |
| 110 gal | 191 | 40,133 |
| 165 gal | 191 | 40,133 |
| 275 gal | 191 | 40,133 |
| 550 gal | 191 | 40,133 |
| 1,000 gal | 191 | 40,133 |
| 1,500 gal | 191 | 40,133 |
| 2,500 gal | 191 | 40,133 |
| 5,000 gal | 191 | 40,133 |
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