[GpsFrontier]

I have 3 levels of hydroponic systems. Each level has it's own 275 gallon reservoir (filled to about 250 gallons) buried 4 feet deep in the ground to keep them cool during the summer. Each level has 7 different grow beds. The water level in the grow beds will be adjustable, but at a height of about 3 inches (where I plan to keep it) it will take more than half the water in the reservoir to flood the 7 grow beds. Depending on the phase the plants in that level are in, each level will have anywhere from 500+ to 2,000 plants growing in it at any given time. That comes out to about 1/2 gallon of water per plant for the levels with 500+ plants, and about 1/8 gallon per plant for the level growing 2,000 plants. I plan to be able to sell 1,000 plants a week, and have a continual supply of plants to sell all year long. That's the goal (1,000 plants a week) anyway.

P.S.
I don't really want more than half the reservoir emptied during flooding because the more water that stays underground, the more stable and cool the water will stay throughout our summer heat.