000			04182nas|a2200433 ; 4500
005			20260817173405.0
008			951012s1994 th uzm rtt 00| a1eng d
035			_a.b10151461
099		9	_aAIT Thesis no. IR-93-14
100	1		_aBadiger, Shrinivas M.
245	1	2	_aA comparative study of the methods for the design of level basin irrigation systems
260			_aBangkok : _bAsian Institute of Technology, _c1994
300			_a152 leaves : _bill. + _e1 online resource
490	1		_aThesis ; _vno. IR-93-14
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1993
500			_aA thesis submitted m partial fulfillment of the requirement for the degree of Master of Engineering, School of Civil Engineering
520			_aLevel basin irrigation system is one of the oldest and widely used surface irrigation methods. A review of the design procedures for level basins indicates that the analytical design methods could be broadly grouped as volume balance, zero inertia, kinematic-wave and fully dynamic. Most available hydraulic models presently used, consider unit width approach in the design which does not exactly reflect the flow process in level basins. Volume balance models used are simple, but fail to simulate the advance with a reliable accuracy. While, zero inertia models are quite complex and impractical due to the requirements of inputs, and computing facilities at field situations. Small field sizes, low inflows, single turnouts, and irregular field shapes characteristic to Asian irrigation practice limit the use of these models. Theoretically based zero inertia models and volume balance approaches were studied with reference to their applicability to wide, small level basins. Field experiments were conducted considering two basin sizes 780 sq.m and 585 sq.m, and three inflow rates 40, 30 and 20 lps. Kostiakov forms of adjusted infiltration functions performed well, compared to modified Kostiakov, SCS and Philip forms of infiltration functions when used in zero inertia models. Zero inertia models were found better in simulating the advance characteristics, while volume balance approaches performed very well in predicting time of application and percolation losses. An approach using combination of zero inertia and volume balance was suggested wherein advance characteristics derived from zero inertia (Walkers model) for a given set of inflow and soil characteristics may be directly used with volume balance approach (Gupta et al. 1983) for computing the management parameters. The hybrid approach is simple and does not necessarily require computing facilities, while the inaccuracies of volume balance methods were also overcome. An alternative procedure using the technique of dimensional analysis similar to Sharma (1978) was used to derive spread characteristics in level basins, which gave comparable results with the observed.
650		0	_aIrrigation _xResearch _xSri Lanka
650		0	_aIrrigation _xResearch
700	1		_aMurty, V.V.N., _eChairperson
700	1		_aKono, Yasuyuki, _eExamination committee
700	1		_aLoof, Rainer, _eExamination Committee
700	1		_aMurali, N. S., _eExamination committee
710	2		_aThe Government of Japan, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. IR-93-14
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B15973
907			_a.b10151461 _bmnait _cu
902			_a240411
998			_b2 _c951012 _dm _ea _fu _g2
945			_lmnait
945			_lmnait
945			_lmnarc
942			_c20
942			_c40
909			_aBarcode : 30050003076733 _bCREATED : 1995-10-13 _cRECORD # : i10178235 _dLPATRON : 1020046 _eLCHKIN : 2008-07-30 _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 3 _jTOT RENEW : 0
909			_aBarcode : 30050003076741 _bCREATED : 1995-10-13 _cRECORD # : i10178247 _dLPATRON : 1019007 _eLCHKIN : 2008-01-15 _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 1 _jTOT RENEW : 0
909			_aBarcode : 30050160071865 _bCREATED : 2016-04-28 _cRECORD # : i12962843 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
999			_c19767 _d19767