Irrigation · August 2025 · 5 min read
Rainwater harvesting captures and stores precipitation for agricultural use, supplementing well water and municipal supplies. Even modest collection systems on existing farm buildings can provide meaningful water volumes for livestock, nursery irrigation, and equipment washing.
A 1,000-square-foot roof collects approximately 600 gallons per inch of rainfall. Metal roofs provide the cleanest runoff, while asphalt shingles may leach contaminants unsuitable for certain uses. Install gutters with leaf screens, first-flush diverters to discard the initial dirty runoff, and appropriately sized downspouts that feed into your storage system.
Above-ground poly tanks ranging from 1,500 to 10,000 gallons are the most common farm storage option due to ease of installation and low cost. Opaque tanks prevent algae growth, and screened inlets keep debris and mosquitoes out. For drip irrigation use, add a sediment filter and 200-mesh screen filter downstream of the tank to prevent emitter clogging.
Rainwater harvesting laws vary significantly by state — some states actively encourage collection with tax credits, while others in western water rights states restrict it. Colorado, for example, limits residential collection to two 55-gallon barrels, while Texas offers sales tax exemptions on harvesting equipment. Check your state regulations and any local permits required before investing in a large-scale collection system.
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