A 5-m-wide vertical gate is rigidly connected to a 3-m-wide panel which provides a seal fo...

A 5-m-wide vertical gate is rigidly connected to a 3-m-wide panel which provides a seal for an underground drain passage during severe storms. For the situation shown, determine the depth h of fresh water which will cause the gate to begin to open and drain water into the underground passage. A 1.5-m cube of concrete is used to hold the horizontal 3-m-wide panel flush with the ground during normal operating conditions.