I want to place a rainwater cistern in my cellar, with a storage cistern in the attic. I understand the need for a pump and a connection to the rain gutters, but I do not know how to deal with any overflow. Will I need a different pump to get rid of the overflow?

Answer

If you want to gather rainwater through the gutters into a cistern in the cellar and then pump the water up to the attic water cistern, you should install a float switch in the attic cistern to cause the pump to cycle and fill the attic cistern when the water level falls to a low limit. To manager the cellar water cistern overflow you should consider installing a float switch to the same pump to cycle excess water to an exterior water holding tank. This can be accomplished with an electric solenoid valve at a "TEE" in the attic water line. Through this method you can use one pump to serve both functions.

Updated on July 26, 2018

Original Article:

How to Install Your Own Water Cistern System
By howtopam
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