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Storm water and irrigation pond was filling in with debris and sediment. Shoreline was eroding. Algae was a constant problem. |
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Storm water inflow pipe was deteriorating and bank was eroding. |
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Pond water level was 5 feet below average when the project was started the end of August 2006. Debris and muck was excavated and used to rebuild the bank. |
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Damaged trees were marked for removal. |
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A small forebay was excavated below the storm water inflow pipe. A sediment forebay is a small basin constructed at the point of storm water inflow. Storm water flows into the forebay, sediment settles out, and cleaner water flows into the pond. A forebay helps prevent a pond from filling in with sediment. It is much easier and less expensive to clean out a forebay than to dredge a pond. |
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Damaged trees were cut to the ground. The stumps were left so roots could stabilize the bank until they rotted naturally and the new plants established. A layer of compost was spread over the bank. |
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Coir (coconut fiber) logs were installed at the bottom of the bank at the average water level height to prevent the newly rebuilt bank from eroding back into the pond. The logs were 15 feet long and 12 inches in diameter. They were held in place with 12 inch pine stakes. Both the logs and stakes will eventually degrade. By that time, the buffer zone plants should have established and stabilized the bank. |
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Woven coir blankets were installed on the steepest slopes to prevent erosion until new plants become established. These blankets will also eventually degrade. Concrete recycled from an old sidewalk was used as rip rap to fill the forebay and to create the small dam between the forebay and pond. |
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An overview of the completed erosion control measures along 75 feet of shoreline. |
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Plants adapted to growing right at the water's edge were planted on each side of the logs and around the dam. These species include: pickerel weed, lizard's tail, soft rushes, flag iris, hibiscus, sweetflag, and Joe-pye weed. |
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The upper part of the bank was mulched to prevent erosion and control weeds. Half the area was mulched with wood chips the other half with pinestraw to demonstrate different styles. A wide variety of shrubs and perennials were planted. When facing the pond, the left buffer has many traditional landscape plants in a more formal design. The right buffer has many native plants in a more naturalized design. |
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A terraced walkway was installed to provide access to the water and to divide the 2 styles of buffer zones. Recycled concrete held in place with rebar stakes was used for the terrace steps. |
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Geoblock® (Presto Products Company) was installed in each terrace of the walkway to prevent erosion. After backfilling with soil and compost, the terraces were planted with creeping thyme and lightly mulched. |
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Plants were labeled. An informational sign was installed next to a mailbox which contains a handout with buffer zone information and a plant list. |
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An overview of the buffer zone educational garden. Note the cedar tree that was cut down and recycled into the bench under the pine tree. The water level is back up to normal in this picture. |
