Loganville, GA rainwater: 40,694 gallons off a roof
How much rain a roof in Loganville, GA collects
40,694gallons a year
That is a 1,500 sq ft asphalt roof under Loganville, GA's normal 51.2 inches of rain, about 795 gallons for every inch that falls.
In Loganville, 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 Loganville 4.5 Sw station (4.5 mi away). Loganville, GA ranks 67th wettest of the 101 cities covered in Georgia.
Month by month in Loganville
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 4.72 | 3,751 | |
| Feb | 4.53 | 3,600 | |
| Mar | 4.81 | 3,823 | |
| Apr | 3.80 | 3,020 | 69 |
| May | 3.65 | 2,901 | 87 |
| Jun | 4.67 | 3,712 | |
| Jul | 4.81 | 3,823 | |
| Aug | 4.49 | 3,569 | |
| Sep | 3.85 | 3,060 | 62 |
| Oct | 3.44 | 2,734 | 113 |
| Nov | 3.86 | 3,068 | |
| Dec | 4.57 | 3,632 |
Mar is the wettest month (4.81 in, 3,823 gal off the roof); Oct the driest (3.44 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 Loganville?
Best fit: one 55-gallon barrel, which delivers about 278 gallons to the garden in a normal year (83.8% 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 Loganville's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 278 | 39,366 |
| 110 gal | 278 | 39,366 |
| 165 gal | 278 | 39,366 |
| 275 gal | 278 | 39,366 |
| 550 gal | 278 | 39,366 |
| 1,000 gal | 278 | 39,366 |
| 1,500 gal | 278 | 39,366 |
| 2,500 gal | 278 | 39,366 |
| 5,000 gal | 278 | 39,366 |
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