Your search found 10 records
1 Ley, T. W.; El-Kady, M.; Litwiller, K. E.; Hanson, E.; Braunworth, W. S.; El-Falaky, A.; Wafik, E. 1984. The influence of farm irrigation system design and precision land leveling on irrigation efficiency and irrigation water management. Cairo, Egypt: Egypt Water Use and Management Project. xii, 97p. (EWUP technical report no.41)
Farming ; Irrigation design ; Gravity flow ; Flood irrigation ; Water management ; Field tests ; Water use efficiency / Egypt
(Location: IWMI-HQ Call no: 631.7.1 G232 LEY Record No: H0161)
The results of EWUP studies at each of three locations in Egypt: El-Mansuriya, Kafr El-Shiek and El-Minya, to characterize the conventional farm irrigation systems used by farmers in each area are summarized. The method used is surface gravity flooding of small, flat basins or small basins with short furrows. Numerous irrigation field trials on farms at the three EWUP study areas have been conducted. The practices tested included precision land levelling to dead level; level border strip or level long furrow irrigation system design; and teaching and advising farmers concerning improved on-farm water management practices in the use of the improved systems. Results were found to be highly successful when the spatial and temporal variations in farm irrigation system design factors were properly accounted for. A significant factor is the need to continue working with the farmer after system construction, teaching and advising him of improved management practices with the new systems. EWUP experience has shown that when farmers are well advised in using the new systems improved results are significant.
2 Litwiller, K. E.; Tinsley, R. L.; Deweeb, H. H.; Ley, T. W.. 1984. Infiltration studies on Egyptian vertisols. Cairo: Egypt Water Use and Management Project. ix, 66p. (EWUP technical report no.57)
Infiltration ; Soil water ; Water table ; Surface drainage ; Water distribution ; Water management / Egypt
(Location: IWMI-HQ Call no: 631.7.2 G232 LIT Record No: H037)
Twenty-one cylinder infiltration tests were conducted during irrigation of wheat on the shrinking/swelling vertisol soils of Kafr El-Sheikh, Egypt. Infiltration rates decreased rapidly from 720 mm/ hr for the first minute to 7.2 mm/hr at 2 hours elapsed time, with 1/3 of the tests showing soil sealing. In the majority of tests a well-defined two phase cumulative infiltration curve was determined. Significant correlations of antecedent soil moisture content in the 0-100 mm and 0-200 mm soil depth at the phase change, and average infiltration rate during the first phase were found. The first phase of infiltration was considered to represent flow of water through the soil macropores in the drier upper layer and water through the soil macropores. The second phase represented vertical flow into the wetter lower soil layers and filling of the finite storage space above the high water table. The analysis indicated a design application depth for wheat of not less than 120 mm for the first irrigation and 55 mm for subsequent irrigations under prevailing Abu Raya irrigation practices. Good water distribution across the field was facilitated by low long-term infiltration rates and high water table conditions. With the low second phase infiltration rates, water ponded in field depressions for prolonged periods could be detrimental to crops and requires provision for surface drainage. Precision land levelling would reduce this hazard.
3 Warner, J. W.; Gates, T. K.; Fahim, W.; Ibrahim, M.; Awad, M.; Ley, T. W.. 1984. Hydraulic conductivity and vertical leakage in the clay-silt layer of the Nile alluvium in Egypt. Cairo, Egypt: Egypt Water Use and Management Project. ix, 88p. (EWUP technical report no.60)
(Location: IWMI-HQ Call no: 631.7.2 G232 WAR Record No: H0878)
Data were collected from three sites in Egypt's Nile Valley and Delta to determine saturated hydraulic conductivity in the clay-silt water table aquifer and vertical leakage to the underlying Nile River sands. Auger hole test results gave saturated horizontal hydraulic conductivities of 1103 mm/day for Abyuha in the Middle Nile Valley, 197 mm/day for Beni Magdul near Cairo, and 103 mm/day for Abu Raya in the northern Delta. Auger hole, permeameter, and consolidation tests resulted in saturated vertical hydraulic conductivities of 0.03 to 4.9 mm/day for Abyuha, 0.03 to 0.87 mm/day for Beni Magdul, and 0.03 to 0.45 mm/day for Abu Raya. Several methods were used to determine vertical leakage: Darcy's law, water table decline, water budget, pumping test, and analytical solution. Average vertical leakage rates were very low for each site: 0.59 mm/day in Abyuha, 0.64 mm/day in Beni Magdul and 0.47 mm/day in Abu Raya. These results indicate poor natural drainage characteristics in the clay-silt layer which contribute to the high water table conditions observed throughout Egypt.
4 Gates, T. K.; Ley, T. W.; Clyma, W. 1981. Systems analysis for improvement of surface irrigation. Paper presented at the 1986 Summer Meeting, American Society of Agricultural Engineers, Orlando, 21-24 June 1981.
Surface irrigation ; Irrigation systems ; Irrigation management ; Irrigation design ; Development plans ; Systems analysis
(Location: IWMI-HQ Call no: P 101 Record No: H04105)
5 Clyma, W.; Ley, T. W.. 1980. Irrigation system improvement concepts. In Egypt Water Use and Management Project. Egyptian and American Team Members. Egypt water use and management project: Mid project report. Vol. IV - Appendix c: Technical articles. Fort Collins, CO, USA: Colorado State University. 13p.
(Location: IWMI-HQ Call no: 631.7.1 G232 EGY Record No: H08294)
6 Ley, T. W.; Clyma, W. 1980. Furrow irrigation practices in Northern Colorado. In Egypt Water Use and Management Project. Egyptian and American Team Members. Egypt water use and management project: Mid project report. Vol. IV - Appendix c: Technical articles. Fort Collins, CO, USA: Colorado State University. 26p.
(Location: IWMI-HQ Call no: 631.7.1 G232 EGY Record No: H08297)
7 Ley, T. W.. 1994. Raising the energy efficiency of irrigation pump systems. Irrigation Journal, 44(2):8, 11-15.
(Location: IWMI-HQ Call no: PER Record No: H014688)
8 Ley, T. W.. 1994. An in-depth look at soil water monitoring and measurement tools. Irrigation Journal, 44(3):8, 11-14, 16-20.
(Location: IWMI-HQ Call no: PER Record No: H014692)
9 Ley, T. W.. 1995. Set-move and permanent sprinkler irrigation systems. Irrigation Journal, 45(7):30-32.
Irrigation equipment ; Sprinkler irrigation ; Irrigation efficiency ; Design ; Measurement ; Irrigation operation
(Location: IWMI-HQ Call no: PER Record No: H018012)
10 Ley, T. W.; Allen, R. G.; Hill, R. W. 1996. Weather station siting effects on reference evapotranspiration. In Camp, C. R.; Sadler, E. J.; Yoder, R. E. (Eds.), Evapotranspiration and irrigation scheduling: Proceedings of the International Conference, November 3-6, 1996, San Antonio Convention Center, San Antonio, Texas. St. Joseph, MI, USA: ASAE. pp.727-734.
(Location: IWMI-HQ Call no: 631.7.1 G000 CAM Record No: H020654)
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