How do I clean the raw water intake?

Raw water intakes along rivers and streams can clog during large flooding events or over time.  Bar screens and travelling screens can prevent certain debris from entering the stilling well, but over time logs, sticks, and sediment may clog the intake.  Debris can be cleaned with an excavator is access is available.  Cleaning can also be done manually by hand but this can be a tedious process.  Another option for fine sediment clogging the intake is using a hand-operated dredge with diver-assistance.  Sediment can be removed from the front on an intake and from within the stilling well or between the screens.