BEHSAD Erosion Control Systems are constructed by filling high-strength fabric forms with fine aggregate concrete (structural grout). As a result, they can provide superior performance to rip rap, cast-in-place concrete, or precast concrete erosion control systems while providing significant reductions in construction costs.
BEHSAD fabric forms are installed as a continuous concrete forming system. They are filled by pumping fine aggregate concrete into the forms and can be installed either underwater or in-the-dry. Our forms create a highly durable concrete erosion protection system that outperforms traditional cast-in-place concrete slab systems yet costs less to install than rip rap, cast-in-place, or precastsystems.
Performance Advantages
· The various styles of forms allow the project designer to predetermine the surface contours of the system to slow or increase the flow of water over the surface of the system.
· The fabric forms adapt to minor variations in the contours of the underlying soil, providing greater resistance to undercutting and toe scour.
· Form styles can be chosen to allow for the planting of vegetation within the boundaries of the forms for a more natural appearance, or to allow the form to adapt to uneven settlement in the subgrade beneath the system.
Fabric Forms Designed to Meet Your Site Conditions
Since no two sites are exactly the same, BEHSAD provides a variety of form styles, each designed to meet specific site conditions. We can work closely with your project team to help select the right method of erosion control for your site.
Our range of forms allow for the relief of hydrostatic pressure, containment of fluids in channels or ponds, adaptation to uneven settlement, or establishment of vegetation within the installed structure.
Filter Point Linings provide a permeable concrete lining for structures constructed over firm subgrades and subject to relatively low hydrostatic loads. The doublelayer fabric form is joined by interwoven filter points to form a concrete lining with a deeply cobbled appearance. The spacing of the filter points determines the concrete lining’s thickness and weight, while the specially designed filter points relieve hydrostatic pressure and reduce stress to the fabric form during concrete pumping. If the attenuation of hydraulic force is needed to achieve lower velocities, the high coefficient of hydraulic friction (n = 0.25 to 0.30) of Filter Point’s cobbled surface provides significant advantage over smooth-faced concrete linings.
Uniform Section Linings are smooth-faced, highly impermeable concrete linings. They reduce the leakage of water, waste products, or other fluids into or out of open channels, landfills, ponds, basins, and containment areas. Uniform Section concrete linings are resistant to most chemicals. The double-layer fabric is vertically connected at closely spaced centers by interwoven drop cords of specified length to form a concrete lining of the desired thickness and weight. With a comparatively smooth and uniform cross section, Uniform Section concrete linings exhibit a relatively low coefficient of hydraulic friction (n = 0.015 to 0.02). Specially designed weep tubes may be inserted through the fabric form, prior to filling, to relieve hydrostatic pressure.
