Moore, OK rainwater: 28,279 gallons off a roof
How much rain a roof in Moore, OK collects
28,279gallons a year
That is a 1,500 sq ft asphalt roof under Moore, OK's normal 35.6 inches of rain, about 795 gallons for every inch that falls.
In Moore, 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 0.1 Se station (0.1 mi away). Moore, OK ranks 33rd wettest of the 45 cities covered in Oklahoma.
Month by month in Moore
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 1.45 | 1,152 | |
| Feb | 0.99 | 787 | |
| Mar | 2.49 | 1,979 | |
| Apr | 3.34 | 2,655 | 126 |
| May | 5.42 | 4,308 | |
| Jun | 4.67 | 3,712 | |
| Jul | 3.66 | 2,909 | 86 |
| Aug | 3.47 | 2,758 | 110 |
| Sep | 3.52 | 2,798 | 103 |
| Oct | 3.03 | 2,408 | 165 |
| Nov | 1.79 | 1,423 | |
| Dec | 1.75 | 1,391 |
May is the wettest month (5.42 in, 4,308 gal off the roof); Feb the driest (0.99 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
Which tank size is worth it in Moore
Best fit: one 55-gallon barrel, which delivers about 500 gallons to the garden in a normal year (84.8% 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 Moore's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 500 | 27,044 |
| 110 gal | 500 | 27,044 |
| 165 gal | 500 | 27,044 |
| 275 gal | 500 | 27,044 |
| 550 gal | 500 | 27,044 |
| 1,000 gal | 500 | 27,044 |
| 1,500 gal | 500 | 27,044 |
| 2,500 gal | 500 | 27,044 |
| 5,000 gal | 500 | 27,044 |
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