Rainwater harvestingis the practice of capturing the rain that falls on your property — off the roof, the patio, and the land itself — and storing or directing it so your landscape can use it, instead of letting it run off to the storm drain. Done well, it turns a free, recurring resource into the backbone of a resilient, water-wise property: lower bills, drought protection, healthier soil, and plants that thrive through dry summers. Here's how a complete system works, and how Restore Eden designs and installs one for your land.
How a rainwater harvesting system works
Every system, from a single rain barrel to a full cistern setup, is built from the same four parts. A good design sizes and connects them to your specific roof, rainfall, and goals:
Catchment
The surfaces that collect rain — most often your roof, but also patios, driveways, and the land itself. A 1,000 sq ft roof yields roughly 600 gallons per inch of rain.
Conveyance
Gutters, downspouts, and a first-flush diverter that routes clean water to storage and sends the dirty first rinse away from your tanks.
Storage
Rain barrels, above- or below-ground tanks, or cisterns sized to your roof, your rainfall, and how you intend to use the water.
Distribution
Gravity-fed lines, drip irrigation, or overflow routed into swales and garden beds so every drop ends up in the soil where it's needed.
Passive and active harvesting — use both
There are two ways to harvest rain, and the most resilient properties use them together. Active harvesting stores water in barrels, tanks, or cisterns for on-demand use. Passive harvesting reshapes the land itself — with swales (shallow, level trenches on contour), basins, and heavy mulch — so rainfall slows down and soaks into the soil exactly where plant roots can reach it. Tanks give you stored water you can direct; earthworks hydrate the whole landscape and recharge the ground. A well-designed system layers both, so almost nothing leaves your property as runoff.
Why harvest rainwater
Across the arid West especially, water is the single biggest constraint on a thriving landscape — and the most expensive line on a summer utility bill. Harvesting rain attacks that on every front. It cuts the amount of treated municipal water you pour on your yard. It drought-proofs your garden by storing and sinking water for the dry stretches. And rainwater is simply better for plants than tap water — it's soft, oxygenated, and free of the chlorine and salts that build up in soil over years of irrigation. Most importantly, it keeps water on your land, building soil and resilience instead of washing your topsoil toward the storm drain.
How much water can you actually collect?
More than most people expect. The rule of thumb: a roof sheds about 600 gallons per 1,000 square feet of footprint, per inch of rain (roughly 0.6 gallons per square foot per inch). A 1,500-square-foot roof in a place that gets just 15 inches of rain a year can shed more than 13,000 gallons annually. That water is falling on your property for free every storm — rainwater harvesting is simply the decision to catch it and use it rather than send it down the gutter.
Rainwater harvesting in Colorado & the arid West
Colorado has specific rules worth knowing: residential properties may store rainwater in up to two rain barrels totaling 110 gallons, for outdoor use on the same property. Larger stored systems and other uses can involve water-rights considerations. That sounds limiting, but it isn't the whole picture — a great deal of harvesting can be done passively, by shaping the land to slow and sink rain into the soil, which is treated differently than storing it in tanks. We design every system to work within the rules that apply to your property, leaning on earthworks and soil to do much of the heavy lifting in the arid West.
Irrigating from the tap vs. harvesting rain
| Tap irrigation only | Rainwater harvesting | |
|---|---|---|
| Cost | Rises every season | Free rain, falling cost over time |
| Drought | First thing restricted | Stored + soaked-in reserves |
| Water quality | Chlorine & salts build up in soil | Soft, clean, plant-friendly |
| Your land | Topsoil & runoff lost to the drain | Water & soil kept on site |
| Resilience | Dependent on the utility | Buffered by your own supply |
How we design & install your system
Rainwater harvesting works best when it's designed as part of the whole landscape — which is exactly how we approach it. We start with an Eden Yard Audit: we measure your roof and catchment, study your rainfall and how water moves across your site, and map where it should go. From there we design the full system — catchment, conveyance, storage, and the earthworks and beds the overflow feeds — and either install it for you across the Colorado Front Range or hand your team complete build guides anywhere in the country. It's the same water strategy that anchors every food forest design we create.