Speedway, IN rainwater: 35,472 gallons off a roof
How much rain a roof in Speedway, IN collects
35,472gallons a year
That is a 1,500 sq ft asphalt roof under Speedway, IN's normal 44.6 inches of rain, about 795 gallons for every inch that falls.
In Speedway, 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 Indianapolis 6.5 W station (2.2 mi away). Speedway, IN ranks 29th wettest of the 88 cities covered in Indiana.
Month by month in Speedway
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.99 | 2,376 | |
| Feb | 2.48 | 1,971 | |
| Mar | 3.75 | 2,981 | |
| Apr | 4.45 | 3,537 | |
| May | 4.66 | 3,704 | |
| Jun | 5.29 | 4,205 | |
| Jul | 4.61 | 3,664 | |
| Aug | 3.38 | 2,686 | 121 |
| Sep | 3.34 | 2,655 | 126 |
| Oct | 3.25 | 2,583 | 137 |
| Nov | 3.48 | 2,766 | |
| Dec | 2.95 | 2,345 |
Jun is the wettest month (5.29 in, 4,205 gal off the roof); Feb the driest (2.48 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 Speedway?
Best fit: one 55-gallon barrel, which delivers about 317 gallons to the garden in a normal year (82.6% 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 Speedway's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 317 | 33,985 |
| 110 gal | 317 | 33,985 |
| 165 gal | 317 | 33,985 |
| 275 gal | 317 | 33,985 |
| 550 gal | 317 | 33,985 |
| 1,000 gal | 317 | 33,985 |
| 1,500 gal | 317 | 33,985 |
| 2,500 gal | 317 | 33,985 |
| 5,000 gal | 317 | 33,985 |
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