One of the most popular pumps, the submersible hydraulic pump can be used on a number of applications including dewatering, sludge removal and solids handling.  These pumps are driven by a hydraulic motor and fed by a remote engine driven hydraulic power pack.  These pumps are available in gas or diesel powered units.  They are easy to use and are well suited where electric power is not available or the liquid to be pumped is a challenge.