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Such a storage system would conceivably allow one to manipulate tidal fluctuations within a barrage system and might even be able to get more out of the tide as well. If the tide were coming in then when the interior part of the barrage is its highest and the turbines are about to run out of current, one could cash out energy from the storage devices (at it’s greatest value – most pressurized) and also reduce the volume within the barrage allowing more tidal intake. Then, after the barrage has discharged and the tide is at its lowest then the energy storage device could be refilled (at its cheapest cost – least pressure). I’m not sure if this would allow the energy production to be flattened out more as a bi-product?
My other question about the turbine depth… every 10m of depth adds another atmosphere of pressure (approximately), yet the volume moving back and forth through the turbines should be the same no matter what the depth, yes/no? So, if you have turbines at 10m depth then the water is at two atmospheres whereas if the turbines are at 40m depth then the water is at 5 atmospheres. Can more mechanical energy be extracted from water that is at greater pressure, or, does the increased pressure actually cause the current to decrease such that the equation balances out no matter the depth of the turbines?