Anderson, IN rainwater: 34,383 gallons off a roof
Anderson, IN: gallons off the roof each year
34,383gallons a year
That is a 1,500 sq ft asphalt roof under Anderson, IN's normal 43.3 inches of rain, about 795 gallons for every inch that falls.
In Anderson, IN 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 Anderson Wtr Wks station (1.4 mi away). Anderson, IN ranks 40th wettest of the 88 cities covered in Indiana.
Month by month in Anderson
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 3.12 | 2,480 | |
| Feb | 2.69 | 2,138 | |
| Mar | 3.00 | 2,384 | |
| Apr | 4.16 | 3,306 | 24 |
| May | 4.28 | 3,402 | 9 |
| Jun | 5.39 | 4,284 | |
| Jul | 4.49 | 3,569 | |
| Aug | 3.55 | 2,822 | 100 |
| Sep | 2.94 | 2,337 | 176 |
| Oct | 3.30 | 2,623 | 131 |
| Nov | 3.43 | 2,726 | |
| Dec | 2.91 | 2,313 |
Jun is the wettest month (5.39 in, 4,284 gal off the roof); Feb the driest (2.69 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 Anderson
Best fit: one 55-gallon barrel, which delivers about 356 gallons to the garden in a normal year (81.1% 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 Anderson's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 356 | 32,827 |
| 110 gal | 356 | 32,827 |
| 165 gal | 356 | 32,827 |
| 275 gal | 356 | 32,827 |
| 550 gal | 356 | 32,827 |
| 1,000 gal | 356 | 32,827 |
| 1,500 gal | 356 | 32,827 |
| 2,500 gal | 356 | 32,827 |
| 5,000 gal | 356 | 32,827 |
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 Indiana?
No statewide rainwater harvesting regulations; check county for local incentives
From the 2015 (Pacific Northwest National Laboratory report 24347); not yet re-checked against current law, so check with your state water agency before building anything large. Source