We recently hired Todd and Kari Harris of The Stone People to install a rain water harvesting system at our current project “The Cooper House” The system is designed to collect approximately 1000 gallons of rain water and store it under ground. During the summer months the homeowners will be able to use this water for their lawn and plants. They also will use the water to feed the water fall which is part of our landscape. Here’s how it works.

The Cooper Water Fall

The water is first collected from the roof with normal rain gutters. From there each rain gutter down spout is connected to a series of drain pipes which carry the water to a filter. As water enters the filter, the first twenty five gallons runs right through the filter and into the ground. By allowing the first twenty five gallons go into the ground we get rid of any bad things the water my have picked up from the roof. Once that occurs, the ground around the filter is saturated and the filter begins to fill up with water. When the water reaches a certain level in the filter it begins to drain into an out feed pipe and is carried to the 1000 gallon tank.

The tank is just a hole we dug, which we then wrapped with a heavy rubber liner. Inside the liner we stacked crates similar to milk crates which provide the structure for the tank. We then wrapped the top of the crates with the liner to provide a continuous cover. Also in the tank next to the crates is a pump chamber were the pump that runs the water fall is located. There is an over flow drain on the tank to allow water to escape once the tank is full.

After the tank was complete we poured a concrete walkway right over the top of it. Since the creates are incredibly strong, you can actually drive vehicles over them if you choose. Our concrete is part of a walkway that takes you from the street to the front door of the house. We plan to install a bench at this spot in the walkway so you can sit and watch the waterfall if you choose.

The city of Olympia bases homeowner’s sewer bill on how much water they use. They get the numbers from the water meter. By using water from the roof for irrigation you not only cut down you water bill but also you sewer bill. Imagine the savings if we could use this same water for the toilets inside the house.

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