Bligh's theory
Bligh's theory states that water creeps along the bottom
contour of the structure. The length of creep refers to the length of the path
of water. The loss of head is proportional to the length. The hydraulic
gradient or the loss of head per unit of creep length is HL / L where HL is the
total head loss between upstream and downstream and L is the length. This
theory does not discriminate between horizontal and vertical creeps.
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Bligh's theory |
Khosla's theory
According to this theory the seepage water does not creep
along the bottom contour as stated by Bligh. It moves along a set of stream-lines. In
order to calculate the uplift pressure and exit gradient the theory takes into
account the flow pattern below the impermeable base of hydraulic structures.
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Khosla's theory |
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