Brooklyn Park, MN rainwater: 24,408 gallons off a roof
How much rain a roof in Brooklyn Park, MN collects
24,408gallons a year
That is a 1,500 sq ft asphalt roof under Brooklyn Park, MN's normal 30.7 inches of rain, about 795 gallons for every inch that falls.
In Brooklyn Park, 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 Crystal Ap station (3.4 mi away). Brooklyn Park, MN ranks 75th wettest of the 103 cities covered in Minnesota.
Month by month in Brooklyn Park
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 0.61 | 485 | |
| Feb | 0.62 | 493 | |
| Mar | 1.42 | 1,129 | |
| Apr | 2.88 | 2,289 | 183 |
| May | 4.34 | 3,449 | 1 |
| Jun | 4.37 | 3,473 | |
| Jul | 4.19 | 3,330 | 20 |
| Aug | 4.14 | 3,290 | 26 |
| Sep | 3.16 | 2,512 | 148 |
| Oct | 2.61 | 2,074 | 217 |
| Nov | 1.47 | 1,168 | |
| Dec | 0.90 | 715 |
Jun is the wettest month (4.37 in, 3,473 gal off the roof); Jan the driest (0.61 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 Brooklyn Park?
Best fit: one 55-gallon barrel, which delivers about 472 gallons to the garden in a normal year (79.2% 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 Brooklyn Park's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 472 | 22,932 |
| 110 gal | 472 | 22,932 |
| 165 gal | 472 | 22,932 |
| 275 gal | 472 | 22,932 |
| 550 gal | 472 | 22,932 |
| 1,000 gal | 472 | 22,932 |
| 1,500 gal | 472 | 22,932 |
| 2,500 gal | 472 | 22,932 |
| 5,000 gal | 472 | 22,932 |
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