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Little Topashaw Creek - Construction
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  • The finished project consisted of 72 structures built with about 1,200 trees.  Materials available for LWDS construction were limited to LWD presently in the channel and trees growing in patchy stands on the floodplain. Cleared areas (~3.4 ha) were primarily zones such as fencerows and ditches that landowners wanted cleared for cultivation. No clearing was permitted within 10 m of top bank.

    Photos of construction

  • About two-thirds of the key members were actually buried in the bank. Earth anchors were cabled to 58 (80%) of the completed LWDS. About one LWDS was constructed to protect each 25 meters of channel, which represented an order of magnitude increase in LWD loading. As-built dimensions.

  • Costs for LWDS construction were about $80 per meter of treated bankline, which is only 19% to 49% of recorded costs for recent stone bank stabilization projects in this region. These costs are for the construction contract and do not include design and contract administration. Construction materials, mobilization, and profit are included.

  • About 4,000 willow (Salix nigra) cuttings were planted on point bars and in sediment deposits adjacent to selected LWDS using a water-jetting technique at a cost of about $30,000.