The effective control of destructive erosionin the bank of river canal and coastal defences has solved a difficult problem . This stems from the need a durable outer protectivelayer to adsorb the energy of wave or current .and inner protective layer ,traditionally in the from of an aggregate fillter to prevent.erosion of the bank soil this inner layer has a particularly diffcult role to plye since it must fulfil tthe often conflicting requirements of being fine enough to act as a bank soil filler, yet coarse enough to prevent bank the generation of high differential pressures between bank and external water levels.
these problems are overcome whit properly designed Getex wovan and non-woven Geo-textiles installed to caver the bank To give protection against puncturing during construction or under heavy wave action , a layer of free-draining.aggregate reed brushwood or rice straw can be used to bed the outer protective layer of rip or armour stone.
When the water level in the bank is high there is outward flow tending to carry fines the erodidle bank soil. these are intercepted by getex which allow only twater to pass so preventing erosion.Under heauy wave action water is forced into the bank .Here Getex prevents and transmission of soil and reduces erosive getting action.