Coon Rapids, MN rainwater: 22,906 gallons off a roof
How much rain a roof in Coon Rapids, MN collects
22,906gallons a year
That is a 1,500 sq ft asphalt roof under Coon Rapids, MN's normal 28.8 inches of rain, about 795 gallons for every inch that falls.
In Coon Rapids, MN 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 Andover 1n station (5.4 mi away). Coon Rapids, MN ranks 95th wettest of the 103 cities covered in Minnesota.
Month by month in Coon Rapids
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 0.57 | 453 | |
| Feb | 0.83 | 660 | |
| Mar | 1.44 | 1,145 | |
| Apr | 2.94 | 2,337 | 176 |
| May | 3.57 | 2,837 | 97 |
| Jun | 3.80 | 3,020 | 69 |
| Jul | 4.46 | 3,545 | |
| Aug | 3.60 | 2,861 | 94 |
| Sep | 2.53 | 2,011 | 227 |
| Oct | 2.69 | 2,138 | 207 |
| Nov | 1.38 | 1,097 | |
| Dec | 1.01 | 803 |
Jul is the wettest month (4.46 in, 3,545 gal off the roof); Jan the driest (0.57 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 Coon Rapids?
Best fit: one 55-gallon barrel, which delivers about 704 gallons to the garden in a normal year (81.0% 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 Coon Rapids's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 704 | 21,303 |
| 110 gal | 704 | 21,303 |
| 165 gal | 704 | 21,303 |
| 275 gal | 704 | 21,303 |
| 550 gal | 704 | 21,303 |
| 1,000 gal | 704 | 21,303 |
| 1,500 gal | 704 | 21,303 |
| 2,500 gal | 704 | 21,303 |
| 5,000 gal | 704 | 21,303 |
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 Minnesota?
No statewide rainwater harvesting regulations; check county for local incentives
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