On the Umpqua River of western Oregon...
To seasonally start up a 6,600 gpm self cleaning fish friendly drum screen in early spring requires removal of several feet of river silt which covers the intake. It can't be manually dug out because, at the time of startup, there is about 12 feet of water above the intake.
Please see attached section.
What is the best way to remove the silt?
We are considering installing fixed, 3" or 4" draft tubes down to the intake at EL 50 from the landing at EL 64. At the landing, operators could either (1) pressurize the draft tubes to blow out sediment from around the intake, or (2) suck out rocks and sediment using a diaphragm pump such as a Sandpiper.
Other ideas? Thanks.
To seasonally start up a 6,600 gpm self cleaning fish friendly drum screen in early spring requires removal of several feet of river silt which covers the intake. It can't be manually dug out because, at the time of startup, there is about 12 feet of water above the intake.
Please see attached section.
What is the best way to remove the silt?
We are considering installing fixed, 3" or 4" draft tubes down to the intake at EL 50 from the landing at EL 64. At the landing, operators could either (1) pressurize the draft tubes to blow out sediment from around the intake, or (2) suck out rocks and sediment using a diaphragm pump such as a Sandpiper.
Other ideas? Thanks.
