Which of the following are used to determine flow net?
1. Graphical method
2. Analytical method
3. Electrical method
4. Hydraulic model
a. 1,2,3
b. 2,3,4
c. 1 and 2 only
d. 1,2,3 and 4
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so correct answers is option a which is 1,2,3
graphical
analytical
electrical
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