Example 3: A flow net for flow around a single row of sheet piles in a permeable soil layer is shown below Given that K, = K, = K = 5 x 10-3 cm/sec, determine 1. How high (above the ground surface) the water will rise if piezometers are placed at points a and b. 2. The total rate of seepage through the permeable layer per unit length. 3. The approximate average hydraulic gradient at c. Water level 5.6 m Water table 2.2 m Ground surface Flow channel I Flow channel 2 Flow channel 3 0.38 Scale 5 m Impervious layer

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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.