Holladay, UT rainwater: 16,349 gallons off a roof
Holladay, UT: gallons off the roof each year
16,349gallons a year
That is a 1,500 sq ft asphalt roof under Holladay, UT's normal 20.6 inches of rain, about 795 gallons for every inch that falls.
Holladay, UT has gaps between storms long enough to drain a single barrel. Around 275 gallons of storage catches most of what is worth catching.
Rainfall: NOAA 1991-2020 climate normals, the Holladay 0.5 Ese station (0.7 mi away). Holladay, UT ranks 21st wettest of the 67 cities covered in Utah.
Month by month in Holladay
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.10 | 1,669 | |
| Feb | 1.37 | 1,089 | |
| Mar | 2.49 | 1,979 | |
| Apr | 2.81 | 2,233 | 192 |
| May | 2.64 | 2,098 | 213 |
| Jun | 1.17 | 930 | 396 |
| Jul | 0.76 | 604 | 448 |
| Aug | 0.76 | 604 | 448 |
| Sep | 1.14 | 906 | 400 |
| Oct | 1.90 | 1,510 | 305 |
| Nov | 1.70 | 1,351 | |
| Dec | 1.73 | 1,375 |
Apr is the wettest month (2.81 in, 2,233 gal off the roof); Jul the driest (0.76 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 Holladay
Best fit: a 275-gallon tote or tank, which delivers about 2,091 gallons to the garden in a normal year (87.0% of its need).
If you set one up, link barrels with a short hose at the base so they fill and drain together, and check the overflow points away from the house.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 1,098 | 14,471 |
| 110 gal | 1,611 | 13,958 |
| 165 gal | 1,825 | 13,744 |
| 275 gal | 2,091 | 13,478 |
| 550 gal | 2,134 | 13,435 |
| 1,000 gal | 2,134 | 13,435 |
| 1,500 gal | 2,134 | 13,435 |
| 2,500 gal | 2,134 | 13,435 |
| 5,000 gal (over cap) | 2,134 | 13,435 |
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 Utah?
Up to 2 covered containers of max 100 gal each with no registration; with free registration at the Utah Division of Water Rights, total storage up to 2,500 gal. Use limited to the same parcel where captured.
Checked against the current source on 2026-11-06. Source