2. NEW TECHNIQUES OF
EROSION CONTROLS ON HILL
ROADS
GUIDED BY
PRESENTED BY
LECT. MANJU.P.M Lekshmi priya.m
EPARTMENT OF CIVIL ENGINEERING S7,CIVIL ENGG
Roll Number:31
3. INTRODUCTION
Transportation contributes all round
development of a country and hence plays a
vital rate towards its progress. If the highways
are not properly located and may contribute
sediments to streams. The control of soil and
water is basic to the protection of the road
structure and therefore highway design,
construction and maintenance must be
continually evaluated to minimize erosion and
sedimentation problems
4. MECHANISM OF SURFACE
EROSION
Rain drops hit the slope surface
Impact of raindrop detaches the
particle of soil
The runoff water flowing on slope
surface transports the detached
particle and may also contribute to
further detachment
6. WIND EROSION
Exposed slope of non-cohesive
loose and dry soil
Lack of shelter from wind
Exposed surface with out any
protection
7. FACTORS CONTROLLING
WIND EROSION
Wind velocity
Particle size of the material
exposed to wind
Moisture content of soil
Vegetative cover
8. RAIN EROSION
Rain erosion is phenomenon of transporting of
soil particle due to water action, the influencing
factors for rain water erosion are
Potential of flowing water for initiating particle
detachment
Physical features ie topography, gradient,
embankment slope etc
Soil erodibility governed by clay content, particle
size distribution, compaction , permeability,
shear strength parameters etc of the soil
9. OBJECTIVES OF EROSION
CONTROL
To prevent damage to land adjacent to the
road structure
To reduce the soil loss from the land width
of road, which silts up drainage channel
and pollute rivers
To contribute to the improvement of the
aesthetics of the landscape
To protect and preserve the earth work of
fill or cut slope, ditches and drainage
structure
10. EROSION CONTROL SYSTEM
TRADITION/ CONVENTIONAL
METHODS
Agronomic method
Non-agronomic method
NEW TECHNIQUES –ENGINEER
INOVATION
Reinforced vegetation
Coir geotextiles
13. REINFORCED VEGETATION
Reinforced vegetation by using geo-textiles &
other materials improving slop stability
Synthetics jute & coir used as geo-textiles
Geo-textiles are used for engineering
applications due to their long life
Disadvantage is that it causes air and water
pollution while their non biodegradibility is
responsible for increasing soil pollution
14. COIR GEOTEXTILES
Made from coconut fiber extracted
from the husk of the coconut fruit
It is a biodegradable organic fibre
material containing cellulose and
lignin
It gives max protection to the soil
15. SOME NEW TRENDS
SILT FENCE
CURLEX QUICK GRASS
STEEL GROUND STAPLES
DE WITT PROSPUN
LANDSCAPE FABRIC
POLYPROPYLENE SAND
BAGS
18. STEEL GROUND
STAPLES
Use to anchor your landscape fabrics
Each measures 6”L X 1” W
19. DeWitt pros pun
Landscape Fabric
Capability to stop
weed growth
Environmentally
safe
Easy to use
20. POLYPROPYLENE SAND
BAGS
White poly-string
tie bags are
made of woven
Polypropylene
String is
attached to
the bag.
Each bag
Measures
14” W X 26” L
21. CONCLUSION
In all new construction erosion levels should be
assessed in advance and appropriate protection
measures are incorpoated in design.
In case of existing structures facing erosion
problems, both short term and long term
measures should be considered to ensure
stability. For overall economy use of locally
available materials should be the first choice. In
extreme climatic conditions polymeric grids with
root reinforcing mechanism may be used even
though they are costly
22. REFERENCE
Azeem A and Ali A (1992) Erosion causes and
control techniques for slopes of banks and
cuttings, proceeding Indian geotecnical
conference 1992 ,pp;457-462
Indian highways vol 32 no:6 jane 2004
Coir –organic fibre geotextiles for soil erosion
control –by coir board of India
