Drainage And Dewatering VTU

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1. DRAINAGE AND DEWATERING

Location of ground water table in fine and coarse grained soils

Determination of ground water level by Hvorselev method

Control of ground water during excavation : Dewatering – Ditches and sumps, Well
point system, Shallow well system, Deep well system, Vacuum method, Electro – osmosis method

Chapter -2
Introduction
The Ground water conditions play an important part in the stability of foundations. If the water table lies very close to the base of footings, the bearing capacity and settlement characteristics of the soil would be affected.

Ground water table
Ground water is sub-surface water, but not all sub-surface water is ground water. The upper surface of ground water is the water table. Below this surface, all the pore spaces and cracks in sediments and rocks are completely filled (saturated) with water.





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