To withdraw better water quality from the Potomac River for a water treatment plant during low
flow conditions, Fairfax Water in VA had an off-shore river intake built in 2004. The intake was
comprised of a 36-ft diameter hexagon concrete structure sitting on the bed of the river and a
10×8 ft vertical shaft connected to a 10-ft diameter pipe under the river bed. In addition, a sand
barrier was built around the intake to minimize the sand withdrawal. The sand barrier is a
nonagon concrete structure with approximately a 54 ft diameter.
Mohseni, Omid; Lueker, Matther.
A Physical Model Study of the Fairfax Off- Shore Intake in the Potomac River.
St. Anthony Falls Laboratory.
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