Your search found 9 records
1 Sharma, D. N.; Oad, R. 1990. Variable-time model for equitable irrigation water distribution. Agricultural Water Management, 17(4):367-377.
(Location: IWMI-HQ Call no: PER Record No: H06122)
(0.61 MB)
2 Hager, W. H.; Schwalt, M. 1994. Broad-crested weir. Journal of Irrigation and Drainage Engineering, 120(1):13-26.
(Location: IWMI-HQ Call no: PER Record No: H013876)
The low features over the broad-crested weir vertical upstream wall and sharp-crested corner are analysed experimentally. Only the long crested weir is considered, for which the discharge coefficient remains practically constant. For a relative overflow depth between 10% and 40%, the surface profile, the bottom pressure profile, the boundary separation profile, and the velocity profiles close to the upper corner are self-similar, provided effects of scale may be dropped. For extremely long-crested weirs, undular flow occurs. The first wave profile is shown to be identical with the solitary wave profile. The main properties of the undular hydraulic jump are explored. The broad-crested weir is characterized by insensitivity to tailwater submergence. The modular limit is found practically constant at 75% of the tailwater level, independent of the relative head on the weir. The discharge-head relation for submerged flow is analyzed under a novel approach. Finally, recommendations are specified under which a broad -crested weir may be used as a discharge measurement structure.
3 DeGagne, M. P. J.; Douglas, G. G.; Hudson, H. R.; Simonovic, S. P. 1996. A decision support system for the analysis and use of stage-discharge rating curves. Journal of Hydrology, 184:225-241.
Decision support tools ; Discharge frequency ; Stream flow ; Models ; Regression analysis ; Rivers ; Open channels ; Standards / Canada / Manitoba
(Location: IWMI-HQ Call no: P 4386 Record No: H019865)
4 Skogerboe, G. V.; Merkley, G. P. 1996. Irrigation maintenance and operations learning process. Highlands Ranch, CO, USA: Water Resources Publications, LLC. x, 358p.
Irrigation operation ; Maintenance ; Terminology ; Irrigation engineering ; Irrigation systems ; Training ; Teaching materials ; Monitoring ; Evaluation ; Farmer-agency interactions ; Water delivery ; Watersheds ; Reservoirs ; Irrigation canals ; Open channels ; Canal linings ; Sedimentation ; Dams ; Aquatic weeds ; Erosion ; Surface drainage ; Subsurface drainage ; Gates ; Discharge frequency ; Measurement ; Flow ; Construction technology ; Calibrations ; Velocity ; Weirs ; Design ; Flumes ; Seepage loss ; Irrigation scheduling ; Computer models ; Hydraulics ; Water budget / Thailand / Pakistan / India / Sri Lanka / Philippines / Bolivia
(Location: IWMI-HQ Call no: 631.7.1 G000 SKO Record No: H019955)
5 Skogerboe, G. V.; Aslam, M.; Khan, M. A.; Mahmood, K.; Mahmood, S.; Khan, A. H. 1999. Inflow-outflow channel losses and canal lining cost-effectiveness in the Fordwah Eastern Sadiqia (South) Irrigation and Drainage Project. Lahore, Pakistan: International Water Management Institute (IWMI). Pakistan National Program. vii, 31p. (IWMI Pakistan Report R-085) [doi: https://doi.org/10.3910/2009.531]
Canal linings ; Irrigation canals ; Open channels ; Drainage ; Irrigation programs ; Distributary canals ; Seepage loss ; Flow measurement ; Discharge frequency / Pakistan / Fordwah Eastern Sadiqia / Chishtian Subdivision / Malik Subdivision / Gujjiani Distributary / Bhukan Distributary / Sirajwah Distributary / Haroonabad Subdivision / Hakra Branch Canal
(Location: IWMI-HQ Call no: IIMI 631.7.1 G730 SKO Record No: H025316)
(0.81 MB)
6 Khan, A. H.; Lashari, B.; Khuwaja, M. A.; Memon, A. A.; Skogerboe, G. V. 1998. Water level fluctuations and discharge variability in the Mirpurkhas Sub-Division, Jamrao Canal, Nara Circle, Sindh Province, Pakistan. Hyderabad, Pakistan: International Irrigation Management Institute (IIMI). Pakistan National Program. ix, 31p. (IWMI Pakistan Report R-075 / IIMI Pakistan Report R-075) [doi: https://doi.org/10.3910/2009.549]
Irrigation canals ; Irrigation programs ; Water measurement ; Gates ; Discharge frequency ; Water supply ; Equity ; Water distribution ; Irrigation scheduling / Pakistan / Sindh / Mirpurkhas / Jamrao Canal
(Location: IWMI-HQ Call no: IWMI 631.7.1 G730 KHA Record No: H029991)
7 Khan, A. H.; Lashari, B.; Khuwaja, M. A.; Memon, A. A.; Skogerboe, G. V. 1998. Water level fluctuations and discharge variability in the Mirpurkhas Sub-Division, Jamrao Canal, Nara Circle, Sindh Province, Pakistan. Annexures. Hyderabad, Pakistan: International Irrigation Management Institute (IIMI). Pakistan National Program. pp.33-92. (IWMI Pakistan Report R-075 / IIMI Pakistan Report R-075) [doi: https://doi.org/10.5337/2011.001]
Irrigation canals ; Irrigation programs ; Water measurement ; Gates ; Discharge frequency / Pakistan / Sindh / Mirpurkhas / Jamrao Canal
(Location: IWMI-HQ Call no: IWMI 631.7.1 G730 KHA Record No: H029992)
(3.73 MB)
8 Lashari, B.; Skogerboe, G. V.; Siddiqui, R. 1997. Hydraulic characteristics of pilot distributaries in the Mirpurkhas, Sanghar and Nawabshah districts, Sindh, Pakistan. Lahore, Pakistan: International Irrigation Management Institute (IIMI). Pakistan National Program. vii, 189p. (IWMI Pakistan Report R-028 / IIMI Pakistan Report R-028) [doi: https://doi.org/10.3910/2009.446]
Discharge frequency ; Hydraulics ; Flow ; Water loss ; Seepage ; Water distribution / Pakistan / Sindh / Mirpurkhas / Sanghar / Nawabshah
(Location: IWMI HQ Call no: IIMI 631.7.1 G730 LAS Record No: H009212)
(6.03 MB)
9 El-Hassan, W. H. A.; El-Kassar, G.; Fujimaki, H.; Kitamura, Y.; Khater, A. 2015. Assessment of cost-effective alternatives for improving irrigation systems in the Nile Delta. Irrigation and Drainage, 64(4):454-463. [doi: https://doi.org/10.1002/ird.1931]
Irrigation systems ; Irrigation canals ; Cost benefit analysis ; Crop rotation ; Water requirements ; Water use ; Water distribution ; Pumping ; Discharge frequency ; Irrigation scheduling ; Irrigation efficiency ; Techniques ; Equity / Egypt / Nile Delta / Meet-Yazied Canal / Sefsafa Canal / El-Mesk Canal
(Location: IWMI HQ Call no: e-copy only Record No: H047437)
(0.99 MB)
Preliminary studies were conducted to test new design criteria incorporated in the Sefsafa Canal (SC) with the aim of reducing water application costs without sacrificing irrigation performance. For comparison, we also studied the Meet-Yazied Canal (MYC) (which is run without the new techniques). The cost-reduction measures used in this study included reduction of pump discharge rates and the use of electricity instead of diesel. We found that the location of farms along the irrigation canal had little effect on pump operation hours and amount of applied water; instead, crop patterns were the most important factor in this regard. The water use index (WUI), which is the ratio of applied water to required water, was higher in the SC than in the MYC and El-Mesk Canal (MC). Decreasing the pump discharge increased the amount of applied water to meet crop water requirements. During the winter, the WUI values of 1.11–1.16 achieved discharge rates of 70–80 l s-1 and were considered the optimal values of WUI. Further studies are required to avoid excessive application of water during the summer. The application of new techniques prompted farmers to irrigate their fields at night, thereby reducing water losses and installation and operational costs, and promoting equitable water distribution along the entire irrigation canal and throughout the command area.
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