Timnath, CO rainwater: 11,358 gallons off a roof
Rainwater from a roof in Timnath, CO
11,358gallons a year
That is a 1,500 sq ft asphalt roof under Timnath, CO's normal 14.3 inches of rain, about 795 gallons for every inch that falls.
In Timnath, CO 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 Fcl 5.6 E station (2.2 mi away). Timnath, CO ranks 43rd wettest of the 53 cities covered in Colorado.
Month by month in Timnath
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 0.30 | 238 | |
| Feb | 0.30 | 238 | |
| Mar | 1.04 | 827 | |
| Apr | 1.84 | 1,462 | 313 |
| May | 2.78 | 2,210 | 196 |
| Jun | 1.80 | 1,431 | 318 |
| Jul | 1.61 | 1,280 | 342 |
| Aug | 1.35 | 1,073 | 374 |
| Sep | 1.31 | 1,041 | 379 |
| Oct | 1.10 | 874 | 405 |
| Nov | 0.53 | 421 | |
| Dec | 0.33 | 262 |
May is the wettest month (2.78 in, 2,210 gal off the roof); Jan the driest (0.30 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
What size rain barrel for Timnath
Best fit: 2 linked 55-gallon barrels, which delivers about 2,027 gallons to the garden in a normal year (87.1% 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 Timnath's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 1,274 | 9,634 |
| 110 gal | 2,027 | 8,880 |
| 165 gal (over cap) | 2,075 | 8,833 |
| 275 gal (over cap) | 2,075 | 8,833 |
| 550 gal (over cap) | 2,075 | 8,833 |
| 1,000 gal (over cap) | 2,075 | 8,833 |
| 1,500 gal (over cap) | 2,075 | 8,833 |
| 2,500 gal (over cap) | 2,075 | 8,833 |
| 5,000 gal (over cap) | 2,075 | 8,833 |
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 Colorado?
Most households may use rain barrels: a maximum of two rain barrels with a combined storage of 110 gallons or less per household, rooftop runoff only, used outdoors on the same property (HB16-1005). Larger rooftop collection only for qualifying well-permit holders (SB09-080) or pilot projects (HB09-1129).
Checked against the current source on 2026-11-06. Source