Tenax geomats for the control of erosion on banks for earthen canals and waterways, Tenax geosynthetics

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Banks for earthen canals and waterways

Earthen canals and waterways in general are continuously exposed to erosion and flooding from rainfall, runoff and surface runoff, both on the canal bed and their banks. Under these conditions, the concentrated forces produced by the velocity can cause the formation of holes, longitudinal and transversal furrows and undercutting at the base. The subsequent sliding of earth down the embankment onto the canal bed can also affect the hydraulic properties of the canal itself.
A dense vegetative plant covering on the bed and banks of the canal guarantees an effective defence considering that it increases the profile roughness (subsequently reducing the flow velocity), the sedimentation of suspended solid particles and prevents the detachment of soil. The formation of plant growth covering is accelerated by using a three-dimensional TENAX MULTIMAT geomat which, due to its flexibility, is easy to place on both the bed and banks of the dry canal.

Ashford (GB): Erosion protection of a surface water drainage channel with TENAX MULTIMAT geomats

Ashford (GB): Grass growth established three months after hydroseeding

Anchored to the slopes and base by means of U shaped anchors, the geomat is filled with topsoil and seeded. The planting process allows the roots of the grass to firmly anchor themselves to both the three-dimensional structure and the underlying soil, together forming permanent protection.
Even before vegetation begins to grow, TENAX MULTIMAT geomat is capable of drastically reducing the quantity of soil erosion from slopes and above all it eliminates the formation of rivulets and furrows.
Full-scale tests performed at the University of Utah (USA) have demonstrated that the limit of water velocity, below which erosion of the bank and the base does not occur, greatly increases when the channel is protected by TENAX MULTIMAT geomats.

SCHEMATIC EXAMPLE

PRODUCTS

TENAX MULTIMAT

CASE HISTORIES

Erosion protection surface water drainage channel at Park Farm, Ashford

TECHNICAL DOCUMENTS

TDE003: TENAX MULTIMAT 100 - A three dimensional geosynthetics product for erosion control (1996) (3316kb)

TDE004: Properties and performances of TENAX MULTIMAT and TENAX PROMAT (397kb)

TENAX International B.V. • Geosynthetics Division
Via Ferruccio Pelli, 14 CH-6900 Lugano, Switzerland • Tel +41+91.9242485 • Fax +41+91.9242489

geo@tenax.net

TENAX SpA - Geosynthetics Technical Office (GTO)
Viale Monza, 1- 20125 Milano (MI), Italy • Tel. +39 02.26113532 • Fax +39 02.28971107

gto@tenax.net

TENAX SpA • Divisione Geosintetici
Via dell'Industria, 3 • I-23897 Viganò (LC), Italia • Tel +39 039.9219307 • Fax +39 039.9219200

geo@tenax.net