7 Different Methods of Dewatering

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1. Sump Pumping

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Water is disposed by adjusting the pump of the trench This method is used for shallow bases in waterlogged areas. 

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2. Deep well construction

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This methods of dewatering is more suitable when digging operation (digging trench)  is lower than water table or artesian water present in soil

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3. Freezing Method

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In this methods of dewatering, a wall of frozen clay is made by, freezing the moist soil of the area where the excavation is to be carried out. 

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4. Chemical consolidation

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The soil around the area to be excavated is hardened with a solution of chemical compounds like silicate of soda and calcium chloride. 

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5. Cement grouting

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Cement grout is used, it freezes in stone cracks and clay cavities, making the stone or clay water-tight and monolithic. 

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In this method, ground water flow is diverted into deep well-points in the ground and the part to be excavated is kept free from ground water. 

6. Well Point System

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Electro osmosis method is used to remover hold water by capillary. It Is suitable for dewatering in silts, clayey silts, fine clayey silty sands.  

7. Electro – Osmosis

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