Abstract: The disclosed device is directed towards a surge tank. The surge tank comprises a side wall including an interior surface. A bottom of tank is coupled to the side wall, wherein the side wall and the bottom of tank define an interior of the surge tank and an exterior of the surge tank. At least one inlet is configured to fluidly couple the exterior of the surge tank with the interior of the surge tank. A weir is fluidly coupled to the inlet at the interior of the surge tank. A flexible element is coupled to the weir proximate to the bottom of tank. An outlet is defined in the bottom of tank.