There are few practical examples and technical notes in our country on a long-distance transportation of soil through pipe with the aid of booster pumps. Dredging and reclamation work at port Kanazawa, started in 1967 is carried out by a dredger and four booster pumps connected in series as a discharge length is about seven kilometers at the longest.
　This report discusses the characteristics of the pumping system with booster pumps, its dredging capacities, and a future dredging program on the basis of a field test and the operated records.
　Such related items as both pressures and power of pump, and density of mixture were measured through water and dredging tests to grasp the present actual states of the work and obtain a practical performance diagram showing a capacity of the system. The test revealed that compared with a critical consistency up to 11per cent at the test, mean consistency calculated from the operated records was 8.3 per cent, and there would be some room for improvement in dredging capacity.
　According to the construction program of port Kanazawa, the distance between both areas of dredging and reclamation will get shorter with the progress of the work, so assuming the typical discharge length in each dredging section, authors examined the optimum arrangements of booster pumps and the dreding capacities for each cases.