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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
An oven-dried soil weighing 1.89 N is placed in a pyknometer which is then filled with water. The total weight of the pyknometer with water and soil is 15.81 N. The pyknometer fill
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reinforcement.
how tofind centroid of cercular arc
Explain the simple square footing, simple squral footing and slop footing with the help of drawing
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