Noblesville, IN rainwater: 33,374 gallons off a roof
Noblesville, IN: gallons off the roof each year
33,374gallons a year
That is a 1,500 sq ft asphalt roof under Noblesville, IN's normal 42.0 inches of rain, about 795 gallons for every inch that falls.
In Noblesville, 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 Noblesville 3 W station (3.5 mi away). Noblesville, IN ranks 47th wettest of the 88 cities covered in Indiana.
Month by month in Noblesville
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.82 | 2,241 | |
| Feb | 2.24 | 1,780 | |
| Mar | 3.05 | 2,424 | |
| Apr | 4.27 | 3,394 | 10 |
| May | 4.55 | 3,616 | |
| Jun | 5.02 | 3,990 | |
| Jul | 3.86 | 3,068 | 61 |
| Aug | 3.38 | 2,686 | 121 |
| Sep | 3.97 | 3,155 | 47 |
| Oct | 2.94 | 2,337 | 176 |
| Nov | 3.16 | 2,512 | |
| Dec | 2.73 | 2,170 |
Jun is the wettest month (5.02 in, 3,990 gal off the roof); Feb the driest (2.24 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
What size rain barrel for Noblesville
Best fit: one 55-gallon barrel, which delivers about 343 gallons to the garden in a normal year (82.6% of its need).
If you set one up, a 55-gallon barrel with a downspout diverter is the whole job. Check that the overflow points away from your foundation, because most of Noblesville's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 343 | 31,906 |
| 110 gal | 343 | 31,906 |
| 165 gal | 343 | 31,906 |
| 275 gal | 343 | 31,906 |
| 550 gal | 343 | 31,906 |
| 1,000 gal | 343 | 31,906 |
| 1,500 gal | 343 | 31,906 |
| 2,500 gal | 343 | 31,906 |
| 5,000 gal | 343 | 31,906 |
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