Pressure  flushing  is  one  of  the  methods  in  removing  sediments  from
reservoirs.  In  this  method,  the  sediment  around  the  bottom  outlet is
scoured  locally  and  it would be  necessary  to  decrease  the depth  of
reservoir water level as much as possible. In this research, for the first
time, jet has been used to increase the sediment scour and the sediments
removal nearby the dam. To study the effects of jet on increasing the
sediment  scour,  a  physical  model  was  developed.  Five  jets with three
different velocities and three nozzle diameters were used in two removal
levels  of  outlet.  The  results  have shown that  among  the  variable
parameters,  the  jet  velocity  had the  most effect on sediment  scour.
Moreover, the effects of the mentioned parameters on sediment removal
output were studied and an exponential dimensionless relationship with
high scouring efficiency was found between the sediment removal output
and the effective parameters. The tests have shown that jet method has
had significant effects on increasing the amount of sediment scour output
and can be considered as an alternative method for sediment removal in
reservoir management methods.