A tidal Barrage Flood Generation uses the energy of a rising tide while it moves towards the land. The tidal basin is emptied through sluice gates or lock gates settled on the section of the barrage and at low tide, the basin is totally empty. Due to the tide turns and starts to comes in, the sluice gates are closed and barrage holds back the rising sea level, making a distinction in height between the degree of water on either side of the barrage.

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The sluice gates lead to the entrances to the dams tunnels can either be closed because the seawater rises to permit for a sufficient head of water to develop between the ocean level and the basin level before being generated more kinetic energy as the water rushes through, turning the turbines while water passes. Or may remain open, filling up the basin slowly and maintaining constant water level within the basin as come in the ocean.

The tidal reservoir is filled up through the turbine tunnels that spin turbines generating tidal electricity on the flood tide and is then empty through the opened sluice or lock gates on the ebb tide. Then a flood tidal barrage is a one-way tidal generation scheme on the incoming tide with tidal generation restricted to concerning six hours per tidal cycle until the basin fills up.

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The movement of the water through the tunnels because the tidal basin fills up can be a slow process, thus low-speed turbines are used to generate electrical power. This slow filling cycle permits for fish or other ocean life to enter the enclosed basin without danger from the otherwise fast-rotating turbine blades. Once the tidal basin is filled with water at high tide, all the sluice gates are opened permitting all the trapped water behind the dam to come to the ocean or sea because it ebbs away.

Flood generator tidal power generates electricity on an incoming or flood tide, however, this kind of tidal energy generation is usually much less efficient than generating electricity because the tidal basin empties, referred to as “Ebb Generation”. This is often because the number of kinetic energy contained in the lower 1/2 the basin in which flood generation operates is much less the kinetic energy gift in the higher half of the basin in which ebb generation operates because of the results of gravity and the second filling of the basin from inland rivers and streams connected to it via the land.