An apparatus for controlling the fluid flow rate from a drainage pond that is common in developed sites where the drainage pond is adapted to supply a degree of fluid capacitance so the runoff does not overflow downstream creek beds and the like. The method and apparatus for controlling the fluid draining from a pond comprises a system for allowing a higher flow that is allowed by regulatory bodies when the pond is at a lower level so the pond drains more quickly when it is at a lower water level. Thus the apparatus allows for a smaller retention pond.