Kokomo, IN rainwater: 35,289 gallons off a roof
Rainwater from a roof in Kokomo, IN
35,289gallons a year
That is a 1,500 sq ft asphalt roof under Kokomo, IN's normal 44.4 inches of rain, about 795 gallons for every inch that falls.
In Kokomo, 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 Kokomo 3 Wsw station (2.6 mi away). Kokomo, IN ranks 31st wettest of the 88 cities covered in Indiana.
Month by month in Kokomo
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.95 | 2,345 | |
| Feb | 2.43 | 1,931 | |
| Mar | 3.18 | 2,527 | |
| Apr | 4.28 | 3,402 | 9 |
| May | 4.72 | 3,751 | |
| Jun | 5.21 | 4,141 | |
| Jul | 4.73 | 3,759 | |
| Aug | 3.85 | 3,060 | 62 |
| Sep | 3.66 | 2,909 | 86 |
| Oct | 3.21 | 2,551 | 142 |
| Nov | 3.33 | 2,647 | |
| Dec | 2.85 | 2,265 |
Jun is the wettest month (5.21 in, 4,141 gal off the roof); Feb the driest (2.43 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 Kokomo?
Best fit: one 55-gallon barrel, which delivers about 240 gallons to the garden in a normal year (80.2% 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 Kokomo's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 240 | 33,789 |
| 110 gal | 240 | 33,789 |
| 165 gal | 240 | 33,789 |
| 275 gal | 240 | 33,789 |
| 550 gal | 240 | 33,789 |
| 1,000 gal | 240 | 33,789 |
| 1,500 gal | 240 | 33,789 |
| 2,500 gal | 240 | 33,789 |
| 5,000 gal | 240 | 33,789 |
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