Lawn Irrigation with Harvested Rainwater in Wyoming

Using harvested rainwater for lawn irrigation in Wyoming is a practical way to reduce your water bill and conserve municipal supplies. With 12.9 inches of average annual rainfall, a 1,500-square-foot asphalt shingle roof in Wyoming can collect approximately 8,748 gal per year. lawn irrigation requires roughly 75 gallons per day, during the growing season (April through October). With this setup, rainwater can meet approximately 54.5% of your lawn irrigation needs, saving an estimated $43.74 per year.

Annual Harvest 8,748 gal 1,500 sq ft roof
Annual Demand 16,050 gal lawn irrigation
Demand Met 54.5% of lawn irrigation
Rec. Tank 1,000 gal storage capacity

Monthly Supply vs. Demand for Lawn Irrigation in Wyoming

The table below shows how your monthly rainwater harvest compares to lawn irrigation demand throughout the year. Green values indicate months where your harvest exceeds demand (surplus water for tank storage), while red values show months where you will draw down your stored reserves. Since lawn irrigation is a seasonal activity, demand is zero from November through March, allowing you to build up tank reserves during the off-season.

Month Harvest (gal) Demand (gal) Balance
January 299 0 +299
February 299 0 +299
March 598 0 +598
April 1,047 2,250 -1,203
May 1,495 2,325 -830
June 1,196 2,250 -1,054
July 897 2,325 -1,428
August 673 2,325 -1,652
September 748 2,250 -1,502
October 673 2,325 -1,652
November 449 0 +449
December 374 0 +374

Harvest by Roof Size for Lawn Irrigation

A larger roof collection area directly increases your harvest and the percentage of lawn irrigation demand you can meet with rainwater. The table below shows how different roof sizes perform in Wyoming for lawn irrigation.

Roof Area Annual Harvest Demand Met Rec. Tank Savings/Year
1,000 sq ft 5,831 gal 36.3% 500 gal $29.16
1,500 sq ft 8,748 gal 54.5% 1,000 gal $43.74
2,000 sq ft 11,663 gal 72.7% 1,000 gal $58.32
2,500 sq ft 14,577 gal 90.8% 1,000 gal $72.89

Setting Up Rainwater Harvesting for Lawn Irrigation in Wyoming

Lawn irrigation is the most water-intensive residential use, and harvesting rainwater for this purpose in Wyoming can dramatically reduce your municipal water consumption. For effective lawn watering, you need a pump-and-pressure-tank system capable of running sprinklers — gravity-fed systems do not provide sufficient pressure. A 1,000-2,500 gallon tank is recommended, connected to your existing sprinkler system through a transfer pump. Many homeowners install a dual-source controller that draws from the rainwater tank first and automatically switches to municipal supply when the tank runs low. Consider reducing your lawn area or switching to drought-tolerant grasses to decrease water demand. In Wyoming, cool-season grasses go dormant in summer heat and may not need irrigation during the hottest months.

Metal Roof Upgrade: Lawn Irrigation in Wyoming

Upgrading to a metal roof increases your collection efficiency from 80% (asphalt shingle) to 95%, boosting your annual harvest to 10,387 gal from a 1,500-square-foot roof. This increases your lawn irrigation demand coverage to 64.7% and raises annual savings to $51.94. Metal roofs also last 40-70 years compared to 20-30 years for asphalt shingle, and their smooth surface sheds debris more effectively, reducing maintenance on your collection system and improving water quality.

Other Uses for Rainwater in Wyoming

Explore how harvested rainwater can serve other needs in Wyoming:

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