Septic tanks to cistern, will it work?
I have sewer coming to my area within 2 years. I currently have two 1000 gallon tanks used for my septic system. I was thinking about using the tanks to supply water for my sprinkler system after I get hooked up. I aready have power to the tanks for a pump that is in there now. I figure the two side by side tanks would need to be connected near the bottom to allow water to balance between them. I would then need to add a jet pump(?) to power the system and connect to the in-ground sprinkler. My sprinkler controller already has an input for a booster pump, seems most of the sprinkler infrastructure already exists.
I would just tie my downspouts and water collection drain currently on the property into the tanks. The 4" drain pipe runs right past the tanks now, so that would be very easy. I would just have to figure out a water bypass to the water line if the tanks run dry.
BTW, I have about 7,000sq-ft of lawn.
Is this a waste of time with just 2000 gallons of water? It seems everything I read states cisterns about 7500 gallons and more. Will I use water at a higher rate than I can ever hope to replenish in the tanks? I live in NE.
Otherwise, I'll just fill the tanks with sand.