Geotextile Application Stabilizes Banks of Autauga Creek
April 17, 2017
Mayor Bill Gillespie has long been a proponent of implementing change that increases efficiency and effectiveness. In analyzing the maintenance of the creek banks along Maple Street, he began to formulate an idea that has since been implemented. Urban Management crews have had to cut that grass with weed eaters due to the fact that it was impossible to use mowers. Bank stability is an issue and easy access presented a problem as well.
After reviewing several different types of geogrid and geotextile applications, as well as policies of the U.S. Army Corps of Engineers, we selected a geotextile that could be rolled out and topically applied to the site. Flexamat® is a permanent erosion control mat utilized for stabilizing slopes, channels, low water crossing, inlet/outlet protection, and shorelines. It consists of concrete blocks (6.5˝ x 6.5˝ with a 2.25˝ profile) locked together and embedded into a high strength geogrid. There is 1.5˝ spacing between the blocks that gives the mat flexibility and allows for vegetation growth. The mat is packaged in rolls, making transporting and installing Flexamat® efficient.
Last June, we had a "blow-out" to the creekside embankment. You may view the video here:
Engineering repaired the area and created an access point, which became a key part of implementing the geotextile.
This project has resulted in a successful test application and we will continue to apply it to this area until it is all covered. This project was funded by a Midsouth RC&D grant of $15,000. Further applications will be budgeted by the Engineering Department.
Due to soil conditions and groundwater, a roadside application of geotextile was accomplished about a week ago. Engineering will be applying some dressing to that area (sand and grass seed). You may see this applied in other areas in the future as we continue to make Prattville better one project at a time!
To learn more about Flexamat®, please visit http://flexamat.com/.