Difference between khosla's theory and bligh's theory
Answers
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.
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.