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Learn about various methods such as pumping from wells, borehole test, open-end test, packer test, and more to determine the permeability coefficient in the field, based on Laplace's equation of continuity. Understand the concept of flow nets and seepage calculations for efficient water flow analysis in soil mass.
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methods to determine the permeability coefficient in field Dr. Suhad Dawood Salman Mechanical Engineering Department Faculty of Engineering, Mustansiriyah University, Baghdad, Iraq
There are many useful methods to determine the permeability coefficient in field such as 1. pumping from wells 2. Bore hole test 3. Open – end test 4. Packer test 5. Variable – head tests by means of piezometer observation well
Seepage Laplace’s Equation of Continuity Introduction In many instances, the flow of water through soil is not in one direction only, nor is it uniform over the entire area perpendicular to the flow. In such cases, calculation of ground water flow is generally made by use of graphs referred to as flow nets.
The concept of the flow net is based on Laplace,s equation of continuity, which describes the steady flow condition for a given point in the soil mass.
A combination of number of flow lines and equipotential lines is called a flow net. To construct a flow net, the flow and equipotential lines are drawn (see the above figure which is an example of a completed flow net) in such a way that 1. The equipotential lines intersect the flow lines at right angles. 2. The flow elements formed are approximate squares. The following figure shows another example of a flow net in an isotropic permeable layer.
