Idealistically, the arch in this image should be designed to retain a rising load that reaches into thousands of tons of lifting force. Likewise, thousands of tons are required to be suspended over the arch to hold down the float during the incoming tide. The more weight the arch supports in either direction rising or falling the higher pressures it can achieve by way of the piston pump. This is critical in the energy conversion the tide into heat, electricity, hydrogen, or raw hydraulic horsepower. The ideal float designed to support the entire load of the counterweight on the arch. The ideal arch designed to accept the combined weight of the float and counterweight suspended from it, and this would present the highest practical structural standards possible is presented once constructed. As the tide comes in the weight on the arch is shifted onto the float. Therefore, the more weight the float and arch can support the better it functions at placing the force of the incoming tides between the pistons and cylinders.
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Archimedes Principal of Bouyancy
Hood Canal Floating Bridge