You can use gravity as simple in one tunnel to reduce power cost to the half
Why does oxygen levels reach such high levels in the day and drop so low at night? Do some kind of aqua plants produce oxygen with sunlight or what?
I have been thinking about your split pond system. One of the major setbacks is the requirements for the power backup which is costly. Could you not use a conventional pump to do the moving and oxygenation of the water? If the answer is yes then build a dam/reservoir that holds enough water to substitute for the pump when the power is down, and use the natural out flow of the dam/reservoir to drive the moving and oxygenation of the raceway water. When the power goes down the dam/reservoir can continue to drive the moving and oxygenation of the raceway water.
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