Draw a flow net for the weir shown in Figure 7.22. Calculate the rate of seep- age under the weir. For the flow net drawn in Problem 7.7, calculate the uplift force at the base of the weir per meter length (measured along the axis) of the structure.

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Principles of Seepage

In hydrology, when water flows down in a pore or crack of unsaturated soil due to gravity, the deep layer of soil is called seepage. It is the slow movement of water in the soil layer. Seepage is mainly found near hydraulic structures and is responsible for the stability of earthen-type hydraulic structures.