Silt Curtain
Definition
A temporary sediment barrier installed parallel to the bank of a stream or lake. Used to contain the sediment produced by construction operations on the bank of a stream or lake and allow for its removal.
Where Practice Applies
The silt curtain is used along the banks of streams or lakes where sediment could pollute or degrade the stream or lake.
Planning Considerations
A silt curtain is useful where construction is on the bank of a stream or lake and coarse sediment is a major concern. A silt curtain will not keep the water from being muddy during construction operations, but it will contain the coarse sediment to the construction area. The curtain should obstruct the flow as little as possible to reduce the chance of failure.
Installation Recommendations
The silt curtain should be a filter fabric recommended by the manufacturer for use as a silt curtain. Both ends of the silt curtain should be tied into the bank. The silt curtain should be placed as close as possible to the bank, allowing room for construction operations inside the protected area. In a flowing stream, remove trapped sediment before removing the silt curtain.
The curtain should be anchored to the bottom so sediment cannot go beneath the curtain. It should extend above normal water level. It can be supported by either stakes or floats of adequate strength.
Maintenance
Accumulated sediment must be removed periodically. The curtain must be inspected often and after each storm. Any damage must be immediately repaired.
References
Connecticut Council on Soil and Water Conservation, Connecticut Guidelines for Soil Erosion and Sediment Control, Hartford, CT, January, 1985.