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008			110910s1986 th uu|m rtt 0| a1eng d
035			_a.b10618107
099		9	_aAIT Thesis no. AE-86-04
100	1		_aKalita, Prasanta Kumar
245	1	0	_aSolution for seepage and percolation in paddy fields using finite difference techniques
260			_aBangkok : _bAsian Institute of Technology, _c1986
300			_a89 p.
490	1		_aThesis ; _vno. AE-86-04
500			_aA research study submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1986
520			_aIn some South-East Asian countries where farm sizes are small, a large amount of irrigation water is lost from the paddy fields into surrounding fallow fields through the bunds. The magnitude of both lateral loss known as seepage and vertical loss known as percolation are to be accurately determined for better management of irrigation water. An attempt was made in this study to determine the magnitude of seepage and percolation separately in paddy field condition with variable water table and ponding water depths for different soil textures. For this purpose, the two dimensional steady seepage equation was converted into finite difference expression and the solution was obtained by relaxation technique. A computer program was developed to fit all the boundary conditions and to compute the final improved potentials by the process of iterations. Darcy's law was applied to calculate seepage and percolation from the improved potentials . It was observed that seepage and percolation increased with deeper water table, higher ponding depth and higher value of hydraulic conductivity of the soil . The findings of this model conform to observations done by field experiments.
650		0	_aSoil percolation _xMathematical models
650		0	_aSeepage _xMathematical models
700	1		_aRahman, Md. Ataur, _eChairperson
700	1		_aGupta, Ashim Das, _eExamination Committee
700	1		_aNielsen, Jens Moller, _eExamination Committee
710	2		_aThe Royal Government Of the Netherlands, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. AE-86-04
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B19566
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