Rainwater Harvesting

We see the most success with rainwater harvesting systems that account for:

• Overflow — Even a moderate rainfall on a roof can easily generate hundreds of gallons of water, quickly filling almost any size of rain barrel. Make sure there is a path for overflow away from the foundation. Raingardens make an excellent overflow destination. Captured rainwater can be used to water the rain garden during dry times.

• Winterizing — Water expands when frozen and we have seen a number of rain barrels split open because there wasn’t an easy way for them to be winterized. The illustration above shows a system with a valve that can be used to divert and completely bypass the cistern during the winter months. Or simply keep the valve at the bottom open so it can constantly drain out during the winter months.

• Mosquitos — A sealed system or screen at the inlet will keep mosquitos out.

• Debris — Leaves and dirt that wash off the roof can clog things up. A leaf filter or “first flush” system will help to keep it relatively clean.

• Weight — When full, a 55–gallon barrel weighs over 450 pounds. Make sure there is a sturdy base for it to rest on.

• Algae — Where possible, situate a rain barrel or cistern in a shaded spot to avoid the foul odor that comes with algal growth. If a sunny location is the only option, a dark, opaque material is recommended.