Khosla’s Theory and Concept of Flow Nets
Many of the important hydraulic structures, such as weirs and barrage, were designed on the basis of Bligh’s theory between the periods 1910 to 1925. In 1926 – 27, the upper Chenab canal siphons, designed on Bligh’s theory, started posing undermining troubles. Investigations started, which ultimately lead to Khosla’s theory . The main principles of this theory are summarized below: (a) The seepage water does not creep along the bottom contour of pucca flood as started by Bligh, but on the other hand, this water moves along a set of stream-lines. This steady seepage in a vertical plane for a homogeneous soil can be expressed by Laplacian equation: Where, φ = Flow potential = Kh; K = the co-efficient of permeability of soil as defined by Darcy’s law, and h is the residual head at any point within the soil. The above equation represents two sets of curves intersecting each other orthogonally. The resultant flow diagram showing both of...