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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
Define the Alternate Depths In open channels, two alternate depths of flow have the same energy for the same flow rate. As shown in the figure, the hyperbolic plot of energy (x
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Define Influence lines Provides information at a single point on a beam Can be used for: - Reactions - Internal shear forces - Internal moment Indicate
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