definitionThese modular systems are made of impermeable materials and are joined together to form a continuous barrier or wall. These products are self supported and do not rely on frames. Free-standing barriers are divided into two groups, flexible and rigid. These containers are another example of temporary flood protection systems. Flexible free standing barriers are made of free-standing sections, which are self-supporting. The barrier material is flexible and impermeable. The stability of these barriers depends on direct anchorage or the weight of water acting on a long skirt on the upstream side of the defence. The length of the skirt is designed to ensure adequate stability. These are often weighted at the ends to minimise seepage. Rigid barriers may differ in design, however, their behaviour under operation and hydraulic loading are similar. These barriers are made of rigid self supporting units which connect together to make a continuous barrier or wall. They are made of rigid single elements, prefabricated materials or hinged panels with internal supports. Seepage under the barriers can be significant in uneven terrain due to their rigidity (Ogunyoye F. et. al, 2011, p.43).
Co-benefits and impactsAs an application/example of temporal flood protection system, they are quickly and easily placed and removed, efficiently stored and easily transported. The materials used for flexible free-standing barriers are susceptible to tear or puncture, but can usually be repaired during service conditions. They are easily cleaned and reusable. Deployment does not require any equipment, and is quick and easy. The rigid barriers are also quick and easy to install while they do not require large equipment or machinery for installation, they have low mobilisation, demobilisation and clean-up requirements and are easily cleaned and reusable. Their major disadvantage is that significant seepage may occure under the barriers in uneven terrain due to their rigidity.
(Ogunyoye F. et. al, 2011, p.45).
FRI indicators (Show all)Availability of hydraulic structures for river watershed management capable to reduce peak discharges
Illustrations (Show all)rm_images/NoFlood.jpg
Last modified: Sept. 16, 2016, 3:40 a.m.