Abstarct: in today’s world factors like significant population growth and excessive use of natural resources for economical purposes have had its impact on water resources. It should be noticed that it is impossible to increase the sources of fresh water for solving this crisis. The Only possible solution would be water management of existing resources and improving the methods of use. Building dams has been a known way for water management since thousands of years ago. Although numbers of dams built has increased in the past few decades, sedimentation has always been the most important factor in reducing the useful life of dams and many reservoir dams has been abandoned because of being filled with sediment. Various methods such as excavation, hydraulic dredging, bypassing systems, etc. exist for sediment removals of dams. Using these methods have been limited and exact quality-quantity control of removed sediment is difficult and will cause decrease in reservoir’s water volume. In addition it is unnecessary to fully remove sediment because of environmental problems and financial issues. Sediment removal also makes it possible for crucial parts of dams like valves to continue working. Hydro-suction is one of the effective techniques in solving the problem of sedimentation in reservoirs which has a local impact and is usually used for removing sediments settled around the entrance valve of plants. Hydro-suction has different models and “burrowing type sediment removal suction pipe method” is one the newest one. In the presented research the effect of velocity change in pipe, size of sediments and the opening status of inlet on the efficiency of the noted method with the use of experimental modeling in two diameters of the pipe was investigated. Examining the results showed that in a sediment with a specified size, the efficiency of sediment removal is increased by increasing the velocity of water in the pipe. And in a constant velocity the efficiency of sediment removal is decreased by increasing the size of sediment. Also in a constant velocity and a specified size of sediment, decreasing the opening percentage of the inlet will cause the efficiency to increase. Test results in 6.1 and 4.7 centimeters pipes with constant velocity and size of sediment showed that the efficiency will be increased by increasing the diameter of pipe.