Westfield, IN rainwater: 34,669 gallons off a roof
How much rain a roof in Westfield, IN collects
34,669gallons a year
That is a 1,500 sq ft asphalt roof under Westfield, IN's normal 43.6 inches of rain, about 795 gallons for every inch that falls.
In Westfield, 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 Carmel 1.5 Nw station (3.9 mi away). Westfield, IN ranks 37th wettest of the 88 cities covered in Indiana.
Month by month in Westfield
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.92 | 2,321 | |
| Feb | 2.44 | 1,939 | |
| Mar | 3.47 | 2,758 | |
| Apr | 4.24 | 3,370 | 14 |
| May | 4.72 | 3,751 | |
| Jun | 5.00 | 3,974 | |
| Jul | 4.31 | 3,426 | 5 |
| Aug | 3.46 | 2,750 | 111 |
| Sep | 3.26 | 2,591 | 136 |
| Oct | 3.32 | 2,639 | 128 |
| Nov | 3.62 | 2,877 | |
| Dec | 2.86 | 2,273 |
Jun is the wettest month (5.00 in, 3,974 gal off the roof); Feb the driest (2.44 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 Westfield?
Best fit: one 55-gallon barrel, which delivers about 328 gallons to the garden in a normal year (83.3% 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 Westfield's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 328 | 33,216 |
| 110 gal | 328 | 33,216 |
| 165 gal | 328 | 33,216 |
| 275 gal | 328 | 33,216 |
| 550 gal | 328 | 33,216 |
| 1,000 gal | 328 | 33,216 |
| 1,500 gal | 328 | 33,216 |
| 2,500 gal | 328 | 33,216 |
| 5,000 gal | 328 | 33,216 |
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