Apparatus for variably cycling the depth of water in a water tank
Apparatus for variably cycling the depth of water in a water tank (4, 4A) between an upper water level and a lower water level. The apparatus comprises a water outlet aperture (5,5A) for location in the tank and having a size to enable water to flow out of the tank at an output rate; pulley strings (7, 7A) for moving the water outlet aperture between an upper position in the tank and a lower position in the tank; and a water inlet (8) for supplying water into the water tank at an input rate; and a controller (13) for actuating the moving of the outlet whereby the water outlet aperture is cycled between the upper and lower position. The input rate of the water inlet is selected to enable an increase in the level of water in the tank to at least the current position of the water outlet aperture as the water outlet aperture is cycled towards the upper position. The size of the water outlet aperture is selected to provide an output rate exceeding the input rate of the water inlet and enabling a decrease in the level of water in the tank to the current position of the water outlet aperture as the water outlet aperture is cycled towards the lower position.
SMITH LAUREN ELIZABETH [GB]; FRASER PETER JOHN [GB]
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