000			03696nam a2200421 4500
005			20260818171625.0
008			090698 th eng
035			_a.b10495824
099		9	_aAIT Thesis no. WA-89-16
100	1		_aPradhan, Niranjan
245	1	0	_aPerformance of small automatic irrigation canal structures under laboratory and field conditions
260			_aBangkok : _bAsian Institute of Technology, _c1989
300			_a110 p. + _e1 online resource
490	1		_aThesis ; _vno. WA-89-16
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1989
520			_aThe present research emphasizes on the calibration and evaluation of an automatic downstream control AVIO Gate and constant flow distributors. In the laboratory, also the leakage through the emergency gate and the AVIO Gate were studied. The modules were tested both for downstream submerged flow and free flow conditions. From submerged flow data, an attempt was made to develop nomographs which can be used as a tool to determine the flow through the modules for any submergence and upstream and downstream head difference by interpolation. Under downstream submergence, the commencement of orifice flow for Single Baffle Module could not be ascertained due to more effect of submergence. But for the Double Baffle Module except the first falling stage the second falling stage could be ascertained, which shows that the module is more suitable for submerged condition. In case of free flow for both the modules, this falling stage nature is clearly seen within the specified head range above the sill. The coefficients of discharge for weir flow and orifice flow have been determined. From the performance study of the gate separately and associated with modules it is seen that the constant downstream level control gate is really an effective means of making more rational use of available water supplies and of running canal systems on a more economical basis. It also provides an attractive and original answer to the problem of equipping water offtakes and other free surface control works required to maintain a definite downstream water level. The actual flow through the distributors in downstream free flow condition varies from the design flow rates at 5% to 15% and in downstream submerged condition the flow rate variation remains within the range of 20% to 30%.
650		0	_aIrrigation _xManagement
650		0	_aIrrigation _xAutomation
700	1		_aLoof, Rainer, _eChairperson
700	1		_aPaudyal, Guna N., _eCo-chairperson
700	0		_aPreecha Kamronrithisorn, _eExamination committee
710	2		_aThe Government of Japan, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. WA-89-16
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B17995
907			_a.b10495824 _bmnait _cs
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