Dublin, GA rainwater: 37,570 gallons off a roof
Dublin, GA: gallons off the roof each year
37,570gallons a year
That is a 1,500 sq ft asphalt roof under Dublin, GA's normal 47.3 inches of rain, about 795 gallons for every inch that falls.
In Dublin, 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 Dublin station (2.1 mi away). Dublin, GA ranks 98th wettest of the 101 cities covered in Georgia.
Month by month in Dublin
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 4.38 | 3,481 | |
| Feb | 4.14 | 3,290 | |
| Mar | 4.58 | 3,640 | |
| Apr | 2.75 | 2,186 | 199 |
| May | 2.62 | 2,082 | 216 |
| Jun | 5.25 | 4,173 | |
| Jul | 4.50 | 3,577 | |
| Aug | 4.81 | 3,823 | |
| Sep | 3.58 | 2,845 | 96 |
| Oct | 3.15 | 2,504 | 150 |
| Nov | 3.08 | 2,448 | |
| Dec | 4.43 | 3,521 |
Jun is the wettest month (5.25 in, 4,173 gal off the roof); May the driest (2.62 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 Dublin
Best fit: one 55-gallon barrel, which delivers about 566 gallons to the garden in a normal year (85.7% 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 Dublin's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 566 | 35,969 |
| 110 gal | 566 | 35,969 |
| 165 gal | 566 | 35,969 |
| 275 gal | 566 | 35,969 |
| 550 gal | 566 | 35,969 |
| 1,000 gal | 566 | 35,969 |
| 1,500 gal | 566 | 35,969 |
| 2,500 gal | 566 | 35,969 |
| 5,000 gal | 566 | 35,969 |
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