Bartlesville, OK rainwater: 31,562 gallons off a roof
Rainwater from a roof in Bartlesville, OK
31,562gallons a year
That is a 1,500 sq ft asphalt roof under Bartlesville, OK's normal 39.7 inches of rain, about 795 gallons for every inch that falls.
In Bartlesville, 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 Bartlesville 3 station (3.9 mi away). Bartlesville, OK ranks 19th wettest of the 45 cities covered in Oklahoma.
Month by month in Bartlesville
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.00 | 1,590 | |
| Feb | 1.88 | 1,494 | |
| Mar | 2.94 | 2,337 | |
| Apr | 4.02 | 3,195 | 41 |
| May | 4.86 | 3,863 | |
| Jun | 5.31 | 4,220 | |
| Jul | 3.70 | 2,941 | 81 |
| Aug | 3.33 | 2,647 | 127 |
| Sep | 3.48 | 2,766 | 108 |
| Oct | 3.45 | 2,742 | 112 |
| Nov | 2.52 | 2,003 | |
| Dec | 2.22 | 1,764 |
Jun is the wettest month (5.31 in, 4,220 gal off the roof); Feb the driest (1.88 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 Bartlesville?
Best fit: one 55-gallon barrel, which delivers about 392 gallons to the garden in a normal year (83.4% 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 Bartlesville's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 392 | 30,240 |
| 110 gal | 392 | 30,240 |
| 165 gal | 392 | 30,240 |
| 275 gal | 392 | 30,240 |
| 550 gal | 392 | 30,240 |
| 1,000 gal | 392 | 30,240 |
| 1,500 gal | 392 | 30,240 |
| 2,500 gal | 392 | 30,240 |
| 5,000 gal | 392 | 30,240 |
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