The current invention is directed to a water skimmer and method of using same in a water containment system where the water skimmer comprises a conduit and float material. The conduit has water apertures and air apertures. The conduit and the float material are adapted to maintain a approximately a 1.5 inch to 6 inch head of water above the water apertures while keeping the air apertures at or above the water level. The number and size of the water apertures in the conduit allow for a predetermined flow rate of water.