4.3.5 Flood Barrier - with Frame
These are flood barriers composed of metal frames with non-rigid impermeable membranes
spanning between them. Some products have other semi-rigid materials also spanning between
the metal frames and covered by impermeable membrane. The impermeable membrane
normally extends upstream to form a long skirt for increased stability and sealing. The frames
of the flood barriers have a tendency to exert high bearing pressures on the bedding surface
and as such may not be suitable for areas with direct application onto soft soils.
Advantages:
! Adapt well to various terrain conditions except hard surfaces
! Some systems can be increased in height during service
! Easily cleaned and re-usable
! Minor repairs to membrane can be made in service conditions! Membrane susceptible to heavy winds especially before flood peak
! High bearing pressure on soil
! Susceptible to leakage at low water levels
! Heavy transportation and storage requirement
! Susceptible to vandalism, accidental tear and puncture damage.
Figure 4.5 shows a typical flood barrier – with frame.