|
|
|
|
|
|
|
Edgefield Gardens and Golf Course
Drainage Ditch Stabilization Project • Troutdale, Oregon; Summer 2007
|
|
Problem
|
After vegetation was cleared to make way for a new golf course hole, it was discovered that a small drainage ditch was eroding badly. This resulted primarily from new construction discharge at the top of the hill above the golf course.
All the stormwater basins drain into this small ditch. Even the smallest rain events cause water levels to go from a trickle to a torrent, and deposit huge amounts of sediment.
|
Project background
|
This drainage ditch has been eroding since the housing development project was first built above it in 1997. It discharges to wetlands, which filter out much of the sediment, and because the ditch was heavily covered with non-native vegetation such as blackberrys and reed canary grass, it was not evident how bad the erosion was.
When the non-native plants were removed, it was possible to see how seriously the ditch has eroded; in some places more than four feet deep, all the way down to its hard clay bottom.
|
Solution
|
The Envirolok Vegetated Retaining Wall system was used for both the sides and bottom of the ditch. It was installed and woven together with bag stabilizer fabric to prevent rushing water from compromising the structure.
The use of 8” minus as foundation bags in the bottom of the channel provided the ‘anchor’ to hold all the bags together.
Storm event erosion is absolutely zero since the installation, and the ecosystem is growing desirable native species that add new habitat to the golf course.
|
Permits - Engineering
Site Construction Supervision
|
Site Construction Supervision was provided by Sunmark Environmental Services of Troutdale, Oregon.
Permitting: Not required for this installation.
|
Environmental Review and Follow-up
|
The ability of the Envirolok Vegetated Retaining Wall System to withstand flashy storm events solved a persistent and costly erosion control issue. It is also providing native vegetation, which improves both the appearance and golfing experience on the course.
Everyone associated with this project is very pleased with the results. The ability of the vegetated retaining wall to control erosion and provide beautiful, self-renewing native vegetation is important both ecologically and financially.
|
|
EdgefieldGardens.pdf
|
|
|
|
|
|
|
|
|