Irrigation Engineering
Solution of Laplacian equation in three dimensions d²φ/dx² + d²φ/dy² + d²φ/dz² = 0 of water in a syphon, is done by

Unwin's method
Method of relaxation
Analytical method
Khosla's method

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Irrigation Engineering
In rigid module, the discharge

Depends upon the water level in distributary
Is independent of water levels in the distributary and water course
Depends upon the water levels of both, i.e. distributary and water course
Depends upon the water level in the water course

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