contol of soil erosion techniques
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WELCOMEWELCOME
NEW TECHNIQUES OF NEW TECHNIQUES OF EROSION CONTROLS ON EROSION CONTROLS ON
HILL HILL ROADSROADS
INTRODUCTION INTRODUCTION Transportation contributes all round Transportation contributes all round
development of a country and hence development of a country and hence plays a vital rate towards its progress. plays a vital rate towards its progress. If the highways are not properly located If the highways are not properly located and may contribute sediments to and may contribute sediments to streams. The control of soil and water streams. The control of soil and water is basic to the protection of the road is basic to the protection of the road structure and therefore highway design, structure and therefore highway design, construction and maintenance must be construction and maintenance must be continually evaluated to minimize continually evaluated to minimize erosion and sedimentation problems erosion and sedimentation problems
MECHANISM OF SURFACE MECHANISM OF SURFACE EROSIONEROSION
Rain drops hit the slope surfaceRain drops hit the slope surface
Impact of raindrop detaches the Impact of raindrop detaches the particle of soilparticle of soil
The runoff water flowing on slope The runoff water flowing on slope surface transports the detached surface transports the detached particle and may also contribute to particle and may also contribute to furtherfurther detachmentdetachment
TYPES OF EROSION TYPES OF EROSION
WIND EROSIONWIND EROSION
RAIN EROSIONRAIN EROSION
WIND EROSION WIND EROSION Exposed slope of non-Exposed slope of non-cohesive loose and dry soilcohesive loose and dry soilLack of shelter from windLack of shelter from wind
Exposed surface with out any Exposed surface with out any protectionprotection
FACTORS CONTROLLING WIND FACTORS CONTROLLING WIND EROSION EROSION
Wind velocityWind velocity
Particle size of the material Particle size of the material exposed to windexposed to wind
Moisture content of soilMoisture content of soil
Vegetative coverVegetative cover
RAIN EROSION RAIN EROSION Rain erosion is phenomenon of transporting of Rain erosion is phenomenon of transporting of soil particle due to water action, the influencing soil particle due to water action, the influencing factors for rain water erosion arefactors for rain water erosion are
Potential of flowing water for initiating particle Potential of flowing water for initiating particle detachment detachment
Physical features ie topography, gradient, Physical features ie topography, gradient, embankment slope etcembankment slope etc
Soil erodibility governed by clay content, particle Soil erodibility governed by clay content, particle size distribution, compaction , permeability, shear size distribution, compaction , permeability, shear strength parameters etc of the soil strength parameters etc of the soil
OBJECTIVES OF EROSION OBJECTIVES OF EROSION CONTROL CONTROL
To prevent damage to land adjacent to the To prevent damage to land adjacent to the road structureroad structureTo reduce the soil loss from the land width To reduce the soil loss from the land width of road, which silts up drainage channel of road, which silts up drainage channel and pollute riversand pollute riversTo contribute to the improvement of the To contribute to the improvement of the aesthetics of the landscapeaesthetics of the landscapeTo protect and preserve the earth work of To protect and preserve the earth work of fill or cut slope, ditches and drainage fill or cut slope, ditches and drainage structurestructure
EROSION CONTROL SYSTEM EROSION CONTROL SYSTEM
TRADITION/ CONVENTIONAL METHODSTRADITION/ CONVENTIONAL METHODS
Agronomic methodAgronomic method
Non-agronomic methodNon-agronomic method NEW TECHNIQUES –ENGINEER INOVATIONNEW TECHNIQUES –ENGINEER INOVATION
Reinforced vegetationReinforced vegetation
Coir geo textilesCoir geo textiles
AGRONOMIC METHOD AGRONOMIC METHOD
Simple vegetative Simple vegetative trufingtrufing
Mulching of slopeMulching of slope
NON AGRONOMIC METHOD NON AGRONOMIC METHOD
Proper road side drainage Proper road side drainage systemsystem
Soil cement stabilizationSoil cement stabilization
Provision of aprons Provision of aprons
REINFORCED VEGETATIONREINFORCED VEGETATION
Reinforced vegetation by using geo-textiles & Reinforced vegetation by using geo-textiles & other materials improving slop stabilityother materials improving slop stability
Synthetics jute & coir used as geo-textilesSynthetics jute & coir used as geo-textiles
Geo-textiles are used for engineering applications Geo-textiles are used for engineering applications due to their long lifedue to their long life
Disadvantage is that it causes air and water Disadvantage is that it causes air and water pollution while their non biodegradibility is pollution while their non biodegradibility is responsible for increasing soil pollutionresponsible for increasing soil pollution
COIR GEOTEXTILES COIR GEOTEXTILES
Made from coconut fiber extracted Made from coconut fiber extracted from the husk of the coconut fruitfrom the husk of the coconut fruit
It is a biodegradable organic fibre It is a biodegradable organic fibre material containing cellulose and ligninmaterial containing cellulose and lignin
It gives max protection to the soilIt gives max protection to the soil
SOME NEW TRENDS SOME NEW TRENDS
SILT FENCESILT FENCECURLEX QUICK GRASSCURLEX QUICK GRASSSTEEL GROUND STAPLESSTEEL GROUND STAPLESDE WITT PROSPUN DE WITT PROSPUN LANDSCAPE FABRICLANDSCAPE FABRICPOLYPROPYLENE SAND BAGSPOLYPROPYLENE SAND BAGS
SILT FENCE SILT FENCE DurableDurable
Light weightLight weight
Easy to useEasy to use
CULEX QUICK GRASS CULEX QUICK GRASS
STEEL GROUND STAPLES STEEL GROUND STAPLES
Use to anchor your Use to anchor your landscape fabricslandscape fabrics
Each measures 6”L X Each measures 6”L X 1” W1” W
DeWitt pros pun Landscape DeWitt pros pun Landscape Fabric Fabric
Capability to stop Capability to stop weed growthweed growth
Environmentally Environmentally safesafe
Easy to useEasy to use
POLYPROPYLENE SAND POLYPROPYLENE SAND BAGS BAGS
White poly-stringWhite poly-stringtie bags are tie bags are made of wovenmade of wovenPolypropylenePolypropyleneString is String is attached toattached tothe bag.the bag.Each bagEach bagMeasuresMeasures14” W X 26” L14” W X 26” L
CONCLUSION CONCLUSION In all new construction erosion levels should be In all new construction erosion levels should be
assessed in advance and appropriate assessed in advance and appropriate protection measures are incorpoated in protection measures are incorpoated in design.design.
In case of existing structures facing erosion In case of existing structures facing erosion problems, both short term and long term problems, both short term and long term measures should be considered to ensure measures should be considered to ensure stability. For overall economy use of locally stability. For overall economy use of locally available materials should be the first choice. available materials should be the first choice. In extreme climatic conditions polymeric In extreme climatic conditions polymeric grids with root reinforcing mechanism may grids with root reinforcing mechanism may be used even though they are costlybe used even though they are costly
REFERENCE REFERENCE Azeem A and Ali A (1992) Erosion causes Azeem A and Ali A (1992) Erosion causes and control techniques for slopes of banks and control techniques for slopes of banks and cuttings, proceeding Indian and cuttings, proceeding Indian geotecnical conference 1992 ,pp;457-462geotecnical conference 1992 ,pp;457-462
Indian highways vol 32 no:6 jane 2004Indian highways vol 32 no:6 jane 2004
Coir –organic fibre geotextiles for soil Coir –organic fibre geotextiles for soil erosion control –by coir board of Indiaerosion control –by coir board of India
THANKYOU THANKYOU
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