Sedalia, MO rainwater: 34,447 gallons off a roof

Rainwater from a roof in Sedalia, MO

34,447gallons a year

That is a 1,500 sq ft asphalt roof under Sedalia, MO's normal 43.3 inches of rain, about 795 gallons for every inch that falls.

In Sedalia, MO 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 Sedalia 1.5 Ssw station (1.6 mi away). Sedalia, MO ranks 49th wettest of the 80 cities covered in Missouri.

Month by month in Sedalia

Month	Rain (in)	Off the roof (gal)	Garden shortfall (gal)
Jan	1.70	1,351
Feb	2.14	1,701
Mar	3.15	2,504
Apr	4.53	3,600
May	5.18	4,117
Jun	5.23	4,157
Jul	4.65	3,696
Aug	3.64	2,893	89
Sep	4.41	3,505
Oct	3.64	2,893	89
Nov	2.90	2,305
Dec	2.17	1,725

Jun is the wettest month (5.23 in, 4,157 gal off the roof); Jan the driest (1.70 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 Sedalia?

Best fit: one 55-gallon barrel, which delivers about 148 gallons to the garden in a normal year (83.6% 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 Sedalia's roof water will pass straight through it.

Tank	Water used (gal/yr)	Spills over (gal/yr)
55 gal	148	33,263
110 gal	148	33,263
165 gal	148	33,263
275 gal	148	33,263
550 gal	148	33,263
1,000 gal	148	33,263
1,500 gal	148	33,263
2,500 gal	148	33,263
5,000 gal	148	33,263

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 Missouri?

No rainwater harvesting regulations

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