Erosion and Sediment Control
Coir Geo Textile for Steep Slope Stabilization and Vegetation Establishment
Soil erosion is the movement and displacement of top layer of soil. Soil erosion along degraded hill slopes has been a serious concern throughout the world. Even though soil erosion is a natural process caused due to water flow, wind and down-slope movement due to the effect of gravity, the intensity has increased due to many man made urbanization, infrastructure developments, constructions and industrial growth. A permanent and self sustaining vegetative cover is an ideal solution for erosion problems. Establishment of vegetation for preventing soil erosion has been extensively discussed. Prevention of soil erosion until the establishment of stable vegetation is difficult. A protective soil cover is required for preventing soil erosion, seed and seedling washing away and supporting vegetation establishment. Coir geo textile is a woven fabric made from coir yarn/fibre extracted from coconut husk. Coir geo textile is found to last from four to six years within the soil environment after which it bio degrades, providing organic matter to soil after degradation. The square mesh in the woven coir geo textile gives vegetation plenty of room to grow, at the same time provides large water bearing capacity per square meter of soil surface. Coir geo textile as a ground cover, helps reduce the velocity of runoff water, resist washing down and keeps the soil intact, this supports the seeds sown and seedlings from being washed away in water. The coir geo textile helps in conserving the moisture content, which supports growth of vegetation. The coir geo textile initially holds the ground for seed and seedlings and provides mechanical support against water erosion, helps the germination of seeds by conserving moisture. Geo textile made of coir is ideally suited for low cost due to its availability in abundance at very low price compared to other synthetic geo textiles, which are hazardous for the environment. Compared to other natural occurring fibres, Coir has great tearing strength even in very wet conditions and much stronger with high lignin content. The plant species selected for vegetation should be suitable for the climatic conditions and should take up deep rooting system after germination. When seeds germinate, they grow through the gaps in the mesh and covers all over the bio degradable coir. This paper presents the application of coir geo textile for preventing soil erosion and developing a self sustaining vegetation in slopes. Further few case studies where Coir geo textile has been used for preventing soil erosion and their results are discussed.