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Sub-surface Drainage:
Sub-surface drainage is intended to take away the water seeping through the pervious layers of the soil, causing a high water table, or in cut slopes of hills. The arrangement usually consists of a trench, at the bottom of which is laid a perforated or porous pipe. The trench is filled with stone aggregates. Figure shows a sub-surface drain in a hill slope, which drains away the water and prevents landslides and slips. Figure shows a sub-surface drainage system for lowering the water table.
Figure : Subsurface Drain at Cut Slopes
Figure : Sub-drains for Lowering Ground Water Table
Surface Drainage: Surface drainage deals with arrangement for quickly leading the water from rainfall away from the surface of pavements, shoulders, slopes of embankments and
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Q. Show the Functions of diaphragm walls? The functions of diaphragm walls are as follows: (i) It is designed to maintain soils during the construction of underground
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