Mustang, OK rainwater: 28,740 gallons off a roof

How much rain a roof in Mustang, OK collects

28,740gallons a year

That is a 1,500 sq ft asphalt roof under Mustang, OK's normal 36.2 inches of rain, about 795 gallons for every inch that falls.

In Mustang, 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 Mustang 0.2 Se station (0.3 mi away). Mustang, OK ranks 31st wettest of the 45 cities covered in Oklahoma.

Month by month in Mustang

Month	Rain (in)	Off the roof (gal)	Garden shortfall (gal)
Jan	1.31	1,041
Feb	1.47	1,168
Mar	2.59	2,059
Apr	3.56	2,830	98
May	5.38	4,276
Jun	4.46	3,545
Jul	3.35	2,663	125
Aug	3.74	2,973	76
Sep	3.70	2,941	81
Oct	3.16	2,512	148
Nov	1.74	1,383
Dec	1.70	1,351

May is the wettest month (5.38 in, 4,276 gal off the roof); Jan the driest (1.31 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 Mustang?

Best fit: one 55-gallon barrel, which delivers about 446 gallons to the garden in a normal year (84.4% 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 Mustang's roof water will pass straight through it.

Tank	Water used (gal/yr)	Spills over (gal/yr)
55 gal	446	27,499
110 gal	446	27,499
165 gal	446	27,499
275 gal	446	27,499
550 gal	446	27,499
1,000 gal	446	27,499
1,500 gal	446	27,499
2,500 gal	446	27,499
5,000 gal	446	27,499

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