Powder Springs, GA rainwater: 44,652 gallons off a roof
How much rain a roof in Powder Springs, GA collects
44,652gallons a year
That is a 1,500 sq ft asphalt roof under Powder Springs, GA's normal 56.2 inches of rain, about 795 gallons for every inch that falls.
In Powder Springs, 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 Mableton 1 N station (6.0 mi away). Powder Springs, GA ranks 11th wettest of the 101 cities covered in Georgia.
Month by month in Powder Springs
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 4.94 | 3,926 | |
| Feb | 4.94 | 3,926 | |
| Mar | 4.94 | 3,926 | |
| Apr | 4.03 | 3,203 | 40 |
| May | 4.18 | 3,322 | 21 |
| Jun | 4.14 | 3,290 | 26 |
| Jul | 7.03 | 5,587 | |
| Aug | 4.81 | 3,823 | |
| Sep | 3.70 | 2,941 | 81 |
| Oct | 4.15 | 3,298 | 25 |
| Nov | 4.46 | 3,545 | |
| Dec | 4.86 | 3,863 |
Jul is the wettest month (7.03 in, 5,587 gal off the roof); Sep the driest (3.70 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
Barrel or cistern in Powder Springs?
Best fit: one 55-gallon barrel, which delivers about 157 gallons to the garden in a normal year (81.2% of its need).
If you buy one, a 55-gallon barrel with a downspout diverter is the whole job. Check that the overflow points away from your foundation, because most of Powder Springs's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 157 | 43,295 |
| 110 gal | 157 | 43,295 |
| 165 gal | 157 | 43,295 |
| 275 gal | 157 | 43,295 |
| 550 gal | 157 | 43,295 |
| 1,000 gal | 157 | 43,295 |
| 1,500 gal | 157 | 43,295 |
| 2,500 gal | 157 | 43,295 |
| 5,000 gal | 157 | 43,295 |
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