000			02899cam a2200349 a 4500
003			EG-GiCUC
005			20250223031303.0
008			150901s2015 ua dh f m 000 0 eng d
040			_aEG-GiCUC _beng _cEG-GiCUC
041	0		_aeng
049			_aDeposite
097			_aM.Sc
099			_aCai01.13.05.M.Sc.2015.Ah.E
100	0		_aAhmed Younis Elsayed Abdelsalam
245	1	0	_aEfficiency and hydraulic performance of canals exposed to uncontrolled maintenance programs and dredging / _cAhmed Younis Elsayed Abdelsalam ; Supervised Mohamed M. Atrees , Ali M. Soliman , Tarek A. Elsamman
246	1	5	_aالكفاءة والأداء الهيدروليكي للقنوات المائية المعرضة للتجريف وبرامج الصيانة الغير ممنهجة
260			_aCairo : _bAhmed Younis Elsayed Abdelsalam , _c2015
300			_a107 P. : _bcharts , facsimiles ; _c30cm
502			_aThesis (M.Sc.) - Cairo University - Faculty of Engineering- Department of Civil Engineering
520			_aIrrigation system in Egypt depends on calibrated curves and tables to connect water levels by discharge of waterways based on old levels and cross sections. That leads to distribute irrigation water to sub-channels depending on water levels only, regardless of the discharge. As a result of implementation of uncontrolled maintenance programs and oppressive dredging the cross sections of canal became deeper and wider, which contributed to the decrease the water levels upstream intakes of the branch canals and water structures. This problem can be noted very clearly in Fayoum governorate, where permanent irrigation system and using weirs as intakes to sub-channels depending only on water levels. El-Gharaq canal, located in the south of Fayoum, was selected to be studied in this research as an example of canals suffering from morphological changes due to dredging processes and improper maintenance programs. Its length is 28.020 km and serves about 48000 feddans. Data required for completion of this research were collected and measured by a team from Hydraulic Research Institute, National water research center. A comparison between the measured cross sections and the designed ones were held to identify the morphological changes occurred. It was found that cross sections expanded irregularly, which means that there is no defined criterion in maintenance. Changes in cross sectional area reached up to 140% of the designed one
530			_aIssued also as CD
653		4	_aCanal Performance
653		4	_aDredging- Channel Maintenance
653		4	_aWater Distribution Efficiency
700	0		_aAli Mohamed Soliman , _eSupervisor
700	0		_aMohamed Moursy Atrees , _eSupervisor
700	0		_aTarek Ahmed Elsamman , _eSupervisor
856			_uhttp://172.23.153.220/th.pdf
905			_aAml _eCataloger
905			_aNazla _eRevisor
942			_2ddc _cTH
999			_c52179 _d52179