Expandable mixing section gravel and cobble eductor

In a hydraulically powered pump for excavating and transporting slurries in which it is immersed, the improvement of a gravel and cobble eductor comprising:

• a tubular expandable mixing section having a center line in alignment with a nozzle capable of lifting cobbles larger than the diameter of the mixing section;
• a primary flow conduit that terminates in a nozzle that creates a water jet internal to said tubular expandable mixing section of said pump when water pressure is applied from a primary supply flow;
• said tubular expandable mixing section being enclosed by a flexible liner having a center line in alignment with said nozzle that creates a water jet;
• an exit diffuser column that envelopes said flexible liner;
• and
• a secondary inlet conduit that forms an opening at a base portion of said exit diffuser column and adjacent to said nozzle and water jet to receive water saturated gravel as a secondary flow that mixes with said primary flow inside of said mixing section to form a combined total flow that exits said mixing section and decelerates in said exit diffuser.