Ada, OK rainwater: 34,137 gallons off a roof
Ada, OK: gallons off the roof each year
34,137gallons a year
That is a 1,500 sq ft asphalt roof under Ada, OK's normal 42.9 inches of rain, about 795 gallons for every inch that falls.
In Ada, 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 Ada 0.3 Nnw station (0.9 mi away). Ada, OK ranks 13th wettest of the 45 cities covered in Oklahoma.
Month by month in Ada
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.02 | 1,606 | |
| Feb | 2.36 | 1,876 | |
| Mar | 3.57 | 2,837 | |
| Apr | 4.17 | 3,314 | 22 |
| May | 5.10 | 4,054 | |
| Jun | 4.88 | 3,879 | |
| Jul | 3.67 | 2,917 | 85 |
| Aug | 3.03 | 2,408 | 165 |
| Sep | 4.52 | 3,593 | |
| Oct | 4.08 | 3,243 | 34 |
| Nov | 2.87 | 2,281 | |
| Dec | 2.68 | 2,130 |
May is the wettest month (5.10 in, 4,054 gal off the roof); Jan the driest (2.02 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
What size rain barrel for Ada
Best fit: one 55-gallon barrel, which delivers about 258 gallons to the garden in a normal year (84.5% 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 Ada's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 258 | 32,979 |
| 110 gal | 258 | 32,979 |
| 165 gal | 258 | 32,979 |
| 275 gal | 258 | 32,979 |
| 550 gal | 258 | 32,979 |
| 1,000 gal | 258 | 32,979 |
| 1,500 gal | 258 | 32,979 |
| 2,500 gal | 258 | 32,979 |
| 5,000 gal | 258 | 32,979 |
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