new techniques of errosion control on hill areas of Government engineering college ramanagara

new technology

1. DEPARTMENT OF CIVIL ENGINEERING A TECHNICAL SEMINAR PRESENTATION ON NEW TECHNIQUES OF EROSION CONTROL ON HILL ROADS PRESENTED BY: NAME OF GUIDE SUSHMA K V Mrs.DEEPIKA K C USN: 1BI21CV468 Assistant professor

2. CONTENT INTRODUCTION MECHANISM OF SURFACE EROSION TYPES OF EROSION OBJECTIVES OF EROSION CONTROL EROSION CONTROL SYSTEM CONCLUSION REFERENCE

3. INTRODUCTION Transportation contributes all round development of a country and hence plays vital rate towords 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 continuously 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 .

5. TYPES OF EROSION WIND EROSION RAIN EROSION

6. WIND EROSION Exposed slope of non cohesive loose and dry soil Lack of shelter from wind Exposed surface with out any protection

7. RAIN EROSION It is a erosion of loose superficial matters by the direct impact of falling rian drops The intensity of the erosion depends on the kinetic energy of falling rain drops It becomes more effective on vegetation free slopes where falling rain drops directly hit the surface with full kinetic energy

8. EROSION CONTROL SYSTEM Tradition/ Conventional methods Agronomic method Non – agronomic method New techniques Rain forced vegetation Coir geotextiles

9. AGRONOMIC METHOD Stabilisation with vegetation and native grasses is relatively inexpensive and effective method as it binds the soil with roots, minimizes raindrops splash and sheet flow erosion, reduce the volume and erosive velocity of runoff, and increases runoff retention time and therefore promotes infiltration

10. NON AGRONOMIC METHOD Proper road side drainage system Table drains Cross drains Catch drains TABLE DRAINS Table drains are excavated open channels that run adjacent to the road formation and are used to collect water runoff from the road surface, over flow and cut batters .

11. CROSS DRAINS Cross drains are used to transfer water flow in table drain located on the high side of a road by piping the water under the road to low side for controlled discharge

12. CATCH DRAINS A catch drains is a constructed depression above a cut or fills batter to prevent batter erosion and direct runoff to a stable discharge point.

13. REINFORCED VEGETATION Reinforced vegetation by using geo-textiles and other materials improving slop stability 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 fibre extracted from the husk or the coconut fruit It is a biodegradable organic fiber material containing cellulose and lignim It gives max protection to the soil

15. CONCLUSION In all new construction erosion levels should be assessed in advance and appropriate protection measures are incorporated 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 and other methods are use when needed

16. REFERNCE Xuan du, jinshi jain , can du, Ryan D. Stewart . “ conservation management decreases surface runoff and soil erosion” Sanat K. Pokharel , jie ha Dov Leshchinsky , Robert L. “ Experimental evaluation of geocell –reinforced bases under repeated loading” A review of road- related soil erosion: An Assessment of causes, evaluation techniques and control measures Coir- organic fibre geotextiles for soil erosion control- by coir board of india Azeem A and Ali A ( 1992) Erosion causes and control techniques for slopes of banks

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