Thursday, December 17, 2009

Fine Grading




About half of the stream has dried out enough so that heavy equipment can go back in.  The contractor is doing the fine grading, getting the elevation of the streambed just right and contouring the banks so they are ready for installation of the bioengineering bank strengthening.  The contractor has also installed a couple of areas of boulder reinforcement like what is shown in the photo above.  The stream restoration consultants will come in tomorrow to look at this boulder reinforcement to make sure it is properly done.  Once the restoration consultant is satisfied with the contractor's work, this bank treatment will be replicated at a few more locations along the stream.  The boulder treatment is being used at spots where erosion potential is greatest--immediately upstream and downstream of the pedestrian bridges, and at a couple of places where the walking trail comes very close to the stream.  The restoration consultant will also be giving the contractor detailed instructions in planting willow poles and stakes, installing coir logs, and building willow wattles.  Some of the willows will even be harvested from within the Nature Center itself.

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