Rogers, MN rainwater: 24,933 gallons off a roof
How much rain a roof in Rogers, MN collects
24,933gallons a year
That is a 1,500 sq ft asphalt roof under Rogers, MN's normal 31.4 inches of rain, about 795 gallons for every inch that falls.
In Rogers, 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 Saint Michael 2.0 Ene station (4.3 mi away). Rogers, MN ranks 71st wettest of the 103 cities covered in Minnesota.
Month by month in Rogers
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 0.73 | 580 | |
| Feb | 0.88 | 699 | |
| Mar | 1.55 | 1,232 | |
| Apr | 2.98 | 2,369 | 171 |
| May | 4.18 | 3,322 | 21 |
| Jun | 4.15 | 3,298 | 25 |
| Jul | 4.19 | 3,330 | 20 |
| Aug | 4.14 | 3,290 | 26 |
| Sep | 3.16 | 2,512 | 148 |
| Oct | 2.68 | 2,130 | 208 |
| Nov | 1.62 | 1,288 | |
| Dec | 1.11 | 882 |
Jul is the wettest month (4.19 in, 3,330 gal off the roof); Jan the driest (0.73 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
Which tank size is worth it in Rogers
Best fit: one 55-gallon barrel, which delivers about 514 gallons to the garden in a normal year (83.0% of its need).
If you set one up, a 55-gallon barrel with a downspout diverter is the whole job. Check that the overflow points away from your foundation, because most of Rogers's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 514 | 23,609 |
| 110 gal | 514 | 23,609 |
| 165 gal | 514 | 23,609 |
| 275 gal | 514 | 23,609 |
| 550 gal | 514 | 23,609 |
| 1,000 gal | 514 | 23,609 |
| 1,500 gal | 514 | 23,609 |
| 2,500 gal | 514 | 23,609 |
| 5,000 gal | 514 | 23,609 |
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