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Silt curtains and contaminated sediment

October 19, 2013

Michigan has suffered from low water levels and
the topic of dredging has received a lot of attention.
The Michigan Senate has voted to authorize $21 million
in emergency spending to dredge harbors.

Many folks along the Clinton River want deeper water

Silt curtain
– Usually used to minimize influence to nearby sensitive areas
– Provide a containment enclosure for turbidity.
– Reduce the flow of current, slow the water down, so that
heavier sediment particles (silt) drops out, i.e. it gets captured.

***~~~ A silt curtain is not a filter. ~~~***

The small holes of curtain fabric are clogged by soil very soon
when under water and it does not pass soil nor water anymore.

Without a silt curtain around the turbidity source,
– free flow velocity (current) can transport fine particles a very long distance.
If there are silt curtains around the turbidity source,
– transport distance of soil is minimized

Silt containment screen

Silt containment screen


Without a silt containment screen

Without a silt containment screen

Proper implementation of a silt curtain
– Float
– Tension Belt
– Curtain fabric
– Bottom Weight
– Anchor Rope
– Anchor Block

A system for silt capture

A system for silt capture

The work site location has various factors as well
– Current velocity (W1)
– Wave height (W2)
– Wind velocity (W3)
– Water depth
– Service life

Current Wind Waves on silt curtain

Current Wind Waves on silt curtain

This is “bit” more elaborate than just some wooden stakes
and some silt containment fabric stapled to it in a haphazard manner.

The Red Run and the Clinton River are still areas of concern
regarding contaminated sediment flowing into the Great Lakes.

~~~ click with mouse to enlarge picture below ~~~

Clinton River contaminated sediment

Clinton River contaminated sediment

Officials from Macomb County will have to work closely with
Oakland County officials concerning the Red Run which flows
beneath Dequindre Road by Warren, Michigan

~~~ click with mouse to enlarge picture below ~~~

Kuhn RTF Red Run Drain

Kuhn RTF Red Run Drain


Dredging the Red Run would provide increased storm water capacity
to deal with the intense rainstorms dumping inches of rain per hour
and water flow into the Clinton River.

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