Del City, OK rainwater: 29,551 gallons off a roof
Rainwater from a roof in Del City, OK
29,551gallons a year
That is a 1,500 sq ft asphalt roof under Del City, OK's normal 37.2 inches of rain, about 795 gallons for every inch that falls.
In Del City, OK 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 Moore 1.3 Ene station (7.6 mi away). Del City, OK ranks 23rd wettest of the 45 cities covered in Oklahoma.
Month by month in Del City
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 1.41 | 1,121 | |
| Feb | 1.53 | 1,216 | |
| Mar | 2.71 | 2,154 | |
| Apr | 3.74 | 2,973 | 76 |
| May | 5.36 | 4,260 | |
| Jun | 4.82 | 3,831 | |
| Jul | 3.59 | 2,853 | 95 |
| Aug | 3.44 | 2,734 | 113 |
| Sep | 3.56 | 2,830 | 98 |
| Oct | 3.15 | 2,504 | 150 |
| Nov | 1.91 | 1,518 | |
| Dec | 1.96 | 1,558 |
May is the wettest month (5.36 in, 4,260 gal off the roof); Jan the driest (1.41 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 Del City?
Best fit: one 55-gallon barrel, which delivers about 452 gallons to the garden in a normal year (84.9% 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 Del City's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 452 | 28,364 |
| 110 gal | 452 | 28,364 |
| 165 gal | 452 | 28,364 |
| 275 gal | 452 | 28,364 |
| 550 gal | 452 | 28,364 |
| 1,000 gal | 452 | 28,364 |
| 1,500 gal | 452 | 28,364 |
| 2,500 gal | 452 | 28,364 |
| 5,000 gal | 452 | 28,364 |
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 Oklahoma?
Encouraged through state legislation: Water for 2060 Act
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