The value obtained by multiplying the water flow (tons) by the head (meters) and dividing by 0.75 (electricity production coefficient, rough estimate) corresponds to the quantity of electricity produced (kWh or kilowatt hours). The quantity of electricity multiplied by the price of electricity on the grid constitutes the gross profit of your hydroelectric plant. After deducting the cost, this is your profit. The cost of hydroelectric power plants is very high, but the payback period is very long. I went to a hydroelectric power station abroad that has been operating for almost a hundred years
51.02 cubic meters of water. 10 kWh = 10 kW × 1 hour = 10,000 Joules, flow = energy ÷ density ÷ acceleration ÷ square flow ÷ 2 = 10,000 ÷ 1,000 ÷ 9.8 ÷ (0.12/2) = 51.02 cubic meters, therefore 10 kilowatts of hydroelectric energy production. The machine requires 51.02 cubic meters of water per hour.