Filter Band Linings are similar to Filter Point Linings, providing an effective and highly permeable concrete lining that resists erosive forces. Filter Band differs from Filter Point in that its form creates interconnected, tubular concrete elements that are separated by large interwoven filter bands.
Filter Band Linings are specified in situations similar to those for which Filter Point might be specified, but which also require greater relief of uplift pressures, higher reduction of flow velocities, or greater reduction of wave run-up.
- The filter bands provide for a greater reduction of uplift pressures than Filter Point Linings.
- Filter Band achieves a greater reduction of flow velocity or wave energy than Filter Point due to its biaxial alignment of the tubular elements which create two directionally-determined coefficients of hydraulic friction.