If a head of water is 8 ft. higher than an evacuation chamber's fountain system's point of discharge (POD) and the valves/connections are 30 ft. in diameter, then how long would it take to send 429245.07 cu. ft. of water to the evacuation chamber (EV)? Both the head of water and the (EV) are vented to atmosphere. The (POD) is one foot above the water level in the (EV). The head of water and the (EV)'s water level remain constant because a pumping system returns water from the (EV) to the head at the same flow cu. ft./ sec. as the water drops from the head. Is this a hard question or didn't I give enough info?

Question