In a suction reservoir, where should a drain pipe discharge to prevent air from being drafted by the pump?

In a suction reservoir, the drain pipe should discharge as far from the pump suction as possible to prevent air from being drafted into the pump. When the drain discharges far from the suction point, it minimizes the turbulence and potential for air entering the suction line. If water discharges too close to the suction, it can cause disturbances in the water flow which may lead to air being mixed in, creating issues such as cavitation.

Discharging the drain far from the suction also helps in ensuring that any surface water or contaminants that might be present do not interfere with the operational integrity of the pump. This consideration is critical in maintaining a steady and reliable water flow, ensuring the functionality of the sprinkler system remains uninterrupted.