The Zone 3 floodplain is located at the confluence of Limekiln Brook, a major tributary, and the Still River.  The work at this location featured a levee enhancement demonstration, repair of erosion scours on the floodplain terrace, and installation of a bio-technical check dam in a drainage slough that conveys storm water to the River. 

Work in Zone 3 was completed by a crew of 8 volunteers from Branson Ultrasonics, US Filter, the Swampfield Land Trust, and others who installed the coconut fiber biologs on September 26.  This work was followed by the work of a landscape contractor who completed the levee installation, installed erosion fabric, placed the check dam, and planted the levee with plants and shrubs.  The photos that follow illustrate this effort.

• Volunteers dig trench and place coconut fiber biologs on the levee.
  

• Volunteers fasten fiber biolog to levee with duckbill anchors and cable.
  
  
• Completed installation of the improved levee.  Raising the height of the levee by 6 inches will cause runoff from parking lots and roads to pool behind the heightened levee, allowing stormwater pollutants to settle out on the floodplain floor.
  
  
• The biolog was planted with bullrush plant plugs.  The fiber will last several years before decomposing, allowing the lateral spread of these plants to develop a dense, raised mat that will replace the biologs and provide the function of the heightened levee.
  
  
• Close-up of the biolog, showing the plant plugs inserted into the fiber.
  
  
• Completed installation of biotechnical checkdam and erosion control fabric on drainage slough.  The biolog will pool the runoff and allow stormwater to pool behind it.  Wetland vegetation planted in front of the dam will absorb pollutants from the discharge through the biolog.
  
  
• Photo taken at the discharge point of the slough to the River, looking up at the erosion control fabric, the plantings, and the check dam.
  

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Last update:  March 10, 2001 11:50 PM