Determine what force T should be applied to the cable t

Determine what force T should be applied to the cable to open a rectangular shield AB of width b if the shutter holds the water pressure equal to H, and the water level above the top edge of the shutter is a. The angle of inclination of the shutter is 600. The shutter can rotate around hinge A. The cable is attached to the shield at an angle α.
Given: b = 300mm = 0.3m; H = 1.2m; a = 0.6m; α = 600.
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