Hydraulic dredging operations remove sediment by mixing the water and the sediment and pumping the material to a dewatering lay-down or staging area. Hydraulic dredges consists of a cutter-head, ladder and a hydraulic pump. The cutter-head is lowered into the sediment where the auger in the cutter-head mixes the water and sediment to form a consistent slurry. The cutter-head depth and rate of speed determine the amount of sediment and water in the mixture.