BANK SHUTTERING

Modern bank shuttering is a form of bank protection that relies essentially on the permeability of the river bank.
Geotextile woven, preferably monofilament, (non-woven material filled with time) adapted to the particle-size distribution of the soil lets pass water while retaining fines, thus removing the risks of uplifts.
The system offers the advantage of reconstituting the banks degraded by a reuse partial or total of materials of the site (vase, alluvial deposits).

it is constituted of wooden stakes, of preference in ekki for several reasons :

Very high resistance allowing weak sections (reduces the visual impact)
Long natural longevity even of the part in permanent contact with water.
No chemical or metallic salt treatments required, wich can be a source of water pollution, being particularly damaging to young fish.

The distance of the stakes, the length of the wooden sheets and the section dependant on the nature of the soil, of the load and the slope of the embankment..
Bank skirting can be held naturally or anchored..
A hurdle, also in ekki made up of interlocking strips is fixed on to the ground side of the stakes.

It has a multitude of roles:

To stops the formation of "bulges" in the embankment.(push taken again partly by the geotextile one)
To ensure the structural rigidity by solidarizing the piles between them.
To allow geotextile to provide its function of filtration thanks to the interwoven of the strip.
To protect the geotextile from UV, the shocks of materials mobilized in the event of raised wearing.
Gives a rustic and natural effect.

Several constructive possibilities :

Piles and interwoven mats (or boards nonjointed) in ekki + a woven geotextile to retain fines of the soil (urban site )(picture opposite)
Piles and geotextile monofilament in tension between the piles with development of the vegetation through meshs. (rural site) This technique requires a maintenance mcuh weaker than the vegetable techniqueto limit the expansion of the vegetation in the lit.
The bank shuttering can be also in oak (wateringues in the north) in acacia, chestnut (not very durable) and generally in pine treated with metal salts without one measuring slow but inexorable dissolution of heavy metals involving a significant pollution in "sleeping" water.

EXAMPLES OF BANK SHUTTERING

Geotextile bank shuttering	Bank shuttering in boards

Bank shuttering urban site	Interwoven 1 m

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