Grovetown, GA rainwater: 38,874 gallons off a roof
How much rain a roof in Grovetown, GA collects
38,874gallons a year
That is a 1,500 sq ft asphalt roof under Grovetown, GA's normal 48.9 inches of rain, about 795 gallons for every inch that falls.
In Grovetown, 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 Evans 2.1 Nnw station (7.0 mi away). Grovetown, GA ranks 92nd wettest of the 101 cities covered in Georgia.
Month by month in Grovetown
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 4.09 | 3,251 | |
| Feb | 3.83 | 3,044 | |
| Mar | 4.35 | 3,457 | |
| Apr | 3.26 | 2,591 | 136 |
| May | 3.03 | 2,408 | 165 |
| Jun | 5.40 | 4,292 | |
| Jul | 5.13 | 4,077 | |
| Aug | 5.62 | 4,467 | |
| Sep | 3.98 | 3,163 | 46 |
| Oct | 2.98 | 2,369 | 171 |
| Nov | 3.07 | 2,440 | |
| Dec | 4.17 | 3,314 |
Aug is the wettest month (5.62 in, 4,467 gal off the roof); Oct the driest (2.98 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 Grovetown
Best fit: one 55-gallon barrel, which delivers about 444 gallons to the garden in a normal year (85.8% 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 Grovetown's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 444 | 37,425 |
| 110 gal | 444 | 37,425 |
| 165 gal | 444 | 37,425 |
| 275 gal | 444 | 37,425 |
| 550 gal | 444 | 37,425 |
| 1,000 gal | 444 | 37,425 |
| 1,500 gal | 444 | 37,425 |
| 2,500 gal | 444 | 37,425 |
| 5,000 gal | 444 | 37,425 |
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