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

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

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Irrigation Engineering
A river is said to be of

Meandering type if it flows in sinuous curve
All of these
Aggrading type if it builds up its bed to a certain slope
Degrading type if it cuts its bed to a certain slope

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