Sheetflow

January 28, 2011

WSDOT Erosion Control Program 1996-1999

Filed under: Article — Sheetflow @ 2:55 am

WSDOT Erosion Control Program 1996-1999
David S. Jenkins
Statewide Erosion Control Coordinator

WSDOT hired a full-time Statewide Erosion Control Coordinator to develop policy and oversee implementation of the Temporary Erosion and Sediment Control (TESC) Program. In addition, the Statewide Erosion Control Coordinator provides on-site technical assistance to Project Inspectors and makes field visits to highway construction sites to evaluate planning and implementation of TESC plans. This provides WSDOT with the opportunity to share successful experiences and develop consistency in program implementation.

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January 21, 2011

Construction Erosion Control Inspection-Part 2

Filed under: Video — Sheetflow @ 2:54 am

Inspecting construction erosion controls at a road construction project. Best management practices include: silt fence, stabilized construction entrance, drip pan, secondary containment of gasoline and concrete washout pan. Issues discussed include: sediment track out, possible catch basin collecting dirty water, gas can sitting out of secondary containment, potential for high pH concrete wash water overflow and equipment drip pan in poor condition.

January 14, 2011

Check Dams are Great But Do Not Reduce Turbidity

Filed under: Video — Sheetflow @ 7:00 am

Check dams are used in ditches to slow the velocity of flowing water, reducing erosive potential. An additional benefit of check dams is to allow some sedimentation in the ponded water behind the dam. Sand and some larger silt can be removed using check dams; colloidal particles cannot. These microscopic particles, with a negative electrical charge, resist sedimentation and are the chief cause of turbidity, or cloudiness of the water. This video clearly shows that the turbidity of water flowing in a ditch is the same after traveling through 8 check dams.

January 7, 2011

Water Runs Over Slope and Causes Erosion

Filed under: Video — Sheetflow @ 7:00 am

Inspecting a project during a rainstorm is sometimes the best way to determine how storm water will flow around the site. It was clear, during this inspection, that the flat area above the slope was graded toward the slope face , which allowed water to flow over and down the slope, causing it to erode. If it was not possible to grade the area above away from the slope, a sand bag berm and a pipe slope drain could have been used to collect the water and convey it to the base of the slope.

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