Eden Prairie, MN rainwater: 24,353 gallons off a roof
Eden Prairie, MN: gallons off the roof each year
24,353gallons a year
That is a 1,500 sq ft asphalt roof under Eden Prairie, MN's normal 30.6 inches of rain, about 795 gallons for every inch that falls.
In Eden Prairie, 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 Mpls Flying Cloud Ap station (1.3 mi away). Eden Prairie, MN ranks 79th wettest of the 103 cities covered in Minnesota.
Month by month in Eden Prairie
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 0.69 | 548 | |
| Feb | 0.62 | 493 | |
| Mar | 1.46 | 1,160 | |
| Apr | 2.73 | 2,170 | 202 |
| May | 3.85 | 3,060 | 62 |
| Jun | 4.67 | 3,712 | |
| Jul | 4.34 | 3,449 | 1 |
| Aug | 4.66 | 3,704 | |
| Sep | 3.05 | 2,424 | 162 |
| Oct | 2.26 | 1,796 | 261 |
| Nov | 1.41 | 1,121 | |
| Dec | 0.90 | 715 |
Jun is the wettest month (4.67 in, 3,712 gal off the roof); Feb the driest (0.62 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 Eden Prairie
Best fit: one 55-gallon barrel, which delivers about 562 gallons to the garden in a normal year (81.7% 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 Eden Prairie's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 562 | 22,965 |
| 110 gal | 562 | 22,965 |
| 165 gal | 562 | 22,965 |
| 275 gal | 562 | 22,965 |
| 550 gal | 562 | 22,965 |
| 1,000 gal | 562 | 22,965 |
| 1,500 gal | 562 | 22,965 |
| 2,500 gal | 562 | 22,965 |
| 5,000 gal | 562 | 22,965 |
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