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

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

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Irrigation Engineering
Pick up the correct statement from the following mention

Gravity water is harmful to crops
Hygroscopic water remains attached to soil molecules by chemical bond
All of these
Capillary moisture held in the soil pores against gravity by surface tension, is utilised by plants

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