Your search found 39 records
1 Reddy, J. M.; Clyma, W. 1984. Irrigation system improvement by simulation and optimization. Cairo, Egypt: Egypt Water Use and Management Project. 2 vols.; iv, 26p.; v, 35p. (EWUP technical report no.16; no.16B)
Simulation ; Optimization ; Mathematical models ; Canal linings ; Irrigation efficiency ; Benefits ; Water conveyance / Pakistan
(Location: IWMI-HQ Call no: 631.7.1 G730 RED Record No: H0159)
Vol. 1 - Theory. A theory for simulation and optimization of an irrigation system to evaluate improvement alternatives was presented. The mathematical simulation model of an irrigation system was developed combining existing models of conveyance, application and water use subsystems. The performance of the subsystem simulation models was verified using available field data from Pakistan. A methodology for the optimal design of a level basin irrigation system was described. Irrigation system improvement alternatives such as canal lining, earthen improvement of the application system were evaluated. Vol. 2 - Application. Wheat production on a watercourse in Pakistan was analyzed. Models for water conveyance, application, and water use subsystems were calibrated with data from the study area. The existing irrigation system operated at a 39 percent application efficiency and 53 percent conveyance efficiency. Optimal design of the application system with precision land leveling provided net benefits of 3625 rupees (Rs) compared to Rs 2612 under traditional field conditions. Canal lining was not economical. Earthen improvement of the conveyance system was beneficial to the farmer with a net profit of Rs 3304. Combined improvement of the application and conveyance systems almost doubled the total net benefits over the traditional system, but with an increased level of investment. The increase in benefits was mostly a result of the increased irrigated area that could be irrigated after the improvements. The benefit/cost ratio of each improvement alternative was different. The difference in benefits between improving the conveyance system and the application system was small, but there was a significant difference in net benefits between any single improvement and the combined improvement of the application and conveyance systems.
2 Reddy, J. M.; Clyma, W. 1984. Optimal design of border irrigation systems. Cairo: Egypt Water Use and Management Project. vi, 34p. (EWUP technical report no.17)
Surface irrigation ; Hydraulics ; Irrigation design ; Crop yield ; Water rates ; Basin irrigation / Egypt
(Location: IWMI-HQ Call no: 631.7.2 G232 RED Record No: H044)
Using a surface irrigation hydraulics model, relationships were developed between water requirement efficiency and the system design variables. Acrop production function was utilized to relate crop yield to the water requirement efficiency. Gross returns from the crop, and the costs of water, labor, ditch construction and crop production were considered in the optimization problem. Several system constraints were incorporated into the design process. The generalized geometric programming technique was applied to the optimaldesign of border and basin irrigation systems. The design variables were: the length of the run, inflow rate into the border, time of inflow, number of lengths of run, width of the border, and the number of border widths in the field.
3 Alwis, J.; Nelson, L.; Gamage, H.; Nandasena, R. A.; Griffin, R. E.; Yoo, K.; Ekanayake, A.; Haider, M.; Wickramasinghe, L.; Dunn, L.; Bandaranayake, M. A. W.; Reddy, J. M.; Laitos, W. R. 1983. System H of the Mahaweli Development Project, Sri Lanka: 1982 diagnostic analysis. Fort Collins, CO, USA: University Services Center. Colorado State University. xii, 139p. (Water management synthesis report no.16)
Diagnostic techniques ; Training ; River basins ; Irrigated farming ; Water use efficiency ; Water control ; Resource management ; Farm management / Sri Lanka / Mahaweli Project
(Location: IWMI-HQ Call no: 631.7 G744 ALW Record No: H0399)
4 Alwis, J.; Nelson, L.; Gamage, H.; Nandasena, R. A.; Griffin, R. E.; Yoo, K.; Ekanayake, A.; Haider, M.; Wickramasinghe, L.; Dunn, L.; Bandaranayake, M. A. W.; Reddy, J. M.; Laitos, W. R. 1983. The Rajangana Irrigation Scheme, Sri Lanka: 1982 diagnostic analysis. Fort Collins, CO, USA: Colorado State University. xii, 118 p. (Water management synthesis report no. 19)
Water management ; Training ; Irrigated farming ; Water control ; Water use efficiency ; Resource management / Sri Lanka
(Location: IWMI-HQ Call no: 631.7.8 G744 ALW Record No: H0398)
5 Venkataraman, K. N.; Nelson, K. N.; Uttamchandani, J. C.; Reddy, J. M.; Laitos, W. R.; Sheng, T. S.; Stanbury, P. C.; Madsen, A. G.; Honeycutt, C. W. 1984. Interdisciplinary diagnostic analysis of and workplan for Dahod Tank Irrigation project, Madhya Pradesh, India. Fort Collins, CO, USA: Colorado State University. viii, 73 p. (Water management synthesis report no. 25)
Flow ; Small scale systems ; Equity ; Water distribution ; Irrigated farming ; Cropping systems ; Women ; Irrigation engineering / India / Madhya Pradesh
(Location: IWMI-HQ Call no: 631.7 G635 VEN Record No: H0510)
6 Jayaraman, T. K.; Lowdermilk, M. K.; Nelson, L. J.; Clyma, W.; Reddy, J. M.; Haider, M. I. 1983. Diagnostic analysis of farm irrigation systems in the Mahi-Kadana Irrigation Project, Gujarat, India. Fort Collins, CO, USA: Colorado State University. xx, 180 p. (Water management synthesis report no. 18)
Irrigated farming ; Information services ; Cropping systems ; Governmental interrelations ; Canals ; Training / India / Gujarat
(Location: IWMI-HQ Call no: 631.7.6.2 G635 JAY Record No: H0513)
7 Clyma, W.; Katariya, S. R.; Nelson, L. J.; Tomar, S. P.; Reddy, J. M.; Bakliwal, S. K.; Haider, M. I.; Mehta, U. R.; Lowdermilk, M. K.; Laitos, W. R.; Mehta, R. R. 1983. Diagnostic analysis on farm irrigation systems on the Gambhiri Irrigation Project, Rajasthan, India: Vols.I - IV. Fort Collins, CO, USA: University Services Center. Colorado State University. iii, 287p. (Water management synthesis report no.17)
(Location: IWMI-HQ Call no: 631.7.8 G635 CLY Record No: H0569)
8 Reddy, J. M.. 1986. Management of gravity flow irrigation systems. In K. C. Nobe and R. K. Sampath, Eds., Irrigation management in developing countries: Current issues and approaches (pp. 95-115). Boulder, CO: Westview Press.
(Location: IWMI-India Call no: 631.7 G000 NOB Record No: H0986)
Deals with water control and the management aspects of gravity flow irrigation systems in general. Briefly outlines the various types of gravity flow irrigation systems. Discusses water control including the main objectives and prerequisites for water control. Expounds on the management of irrigation systems for improved performance as including not only the management of water, but also information and controls. Lastly, the author outlines the components of an effective management plan.
9 Reddy, J. M.. 1986. Evaluation of optimal constant volume control for irrigation canals. St. Joseph, MI, USA: ASAE. 14p. (ASAE paper no.86-2075)
(Location: IWMI-HQ Call no: 631.7.1 G000 RED Record No: H05173)
10 Reddy, J. M.; Apolayo, H. M. 1991. Sensivity of furrow irrigation system cost and design variables. Journal of Irrigation and Drainage Engineering, 117(2):201-219.
(Location: IWMI-HQ Call no: PER Record No: H07869)
11 Reddy, J. M.; Clyma, W. 1980. Optimal design of furrow irrigation systems. 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. 18p.
(Location: IWMI-HQ Call no: 631.7.1 G232 EGY Record No: H08293)
12 Reddy, J. M.; Clyma, W. 1980. Optimal design of border irrigation systems. In Egypt Water Use and Management Project. Egyptian and American Team Members. Egypt Water Use and Management Project: Mid project report. Vol. III - Appendix B: Staff papers, Section 4 of 4. Fort Collins, CO, USA: Colorado State University. 29p. (Staff paper 45)
(Location: IWMI-HQ Call no: 631.7 G232 EGY Record No: H08303)
13 Reddy, J. M.; Clyma, W. 1980. Irrigation system improvement by simulation and optimization: 2 application. In Egypt Water Use and Management Project. Egyptian and American Team Members. Egypt Water Use and Management Project: Mid project report. Vol. III - Appendix B: Staff papers, Section 4 of 4. Fort Collins, CO, USA: Colorado State University. 27p. (Staff paper 46B)
(Location: IWMI-HQ Call no: 631.7 G232 EGY Record No: H08305)
14 Reddy, J. M.; Clyma, W. 1981. Optimal design of furrow irrigation systems. Transactions of the ASAE, 24(3):617-623.
(Location: IWMI-HQ Call no: P 1910 Record No: H08352)
15 Reddy, J. M.; Clyma, W. 1982. Optimizing surface irrigation system design parameters: Simplified analysis. Transactions of the ASAE, 25(4):966-974.
(Location: IWMI-HQ Call no: P 1969 Record No: H08536)
16 Smith, J. L.; Reddy, J. M.; Pochop, L. O.; Lewis, R. W. 1991. Design of turbulent fountain irrigation trash screen. Irrigation and Drainage Systems, 5(3):267-275.
(Location: IWMI-HQ Call no: PER Record No: H09262)
17 Reddy, J. M.; Dia, A.; Oussou, A. 1992. Design of control algorithm for operation of irrigation canals. Journal of Irrigation and Drainage Engineering, 118(6):852-867.
(Location: IWMI-HQ Call no: PER Record No: H011699)
18 Reddy, J. M.; Apolayo, H. M. 1992. Sensitivity of furrow irrigation system cost and design variables. Water Resources Journal, March:37-48.
(Location: IWMI-HQ Call no: PER Record No: H012978)
Considering the minimum cost as the objective, the furrow irrigation system design problem is formulated as an optimization problem. A combination of monotonicity analysis, constraint activity, and condensation are used to simplify the size of the mathematical model of the problem. This reduced model is used to analyze the sensitivity of the optimal design variables of a furrow irrigation system. The Soil Conservation Service (SCS) equations for the design of furrow irrigation along with several constraints are considered in the optimal design. Using an example problem and three different soil types, the system cost and design variables (inflow rate, length of furrow, and time of cutoff) are found to be sensitive to the supply flow rate, the design application depth, and the cost of coefficients of water, labor, and ditch construction. Under the given set of conditions, the cost of furrow irrigation system is very high in the case of a clay soil. The application efficiency achieved was lower in the case of a clay soil than in light (sandy) and medium textured soils.
19 Zerihun, D.; Reddy, J. M.; Feyen, J.; Breinburg, G. 1993. Design and management nomograph for furrow irrigation. Irrigation and Drainage Systems, 7(1):29-41.
(Location: IWMI-HQ Call no: PER Record No: H013383)
There exist capabilities for analyzing the behavior of surface flow and the ultimate distribution of infiltrated water in furrow irrigation. The corresponding synthesis, i.e., the selection of appropriate combinations of inflow rates, cutoff times and length of furrow - design and management, currently not so well established, is treated herein. A design-management nomograph is proposed for free draining graded furrows. This is a plot of efficiency, time of cutoff and uniformity coefficient contours each given on a length-flow rate space adjacent to one another, for a furrow with given infiltration characteristics, flow geometry, slope, roughness and required depth of application. The nomograph can be used to determine the combinations of length, time of cutoff and flow rate that would yield in optimum combination of efficiency and uniformity.
20 Reddy, J. M.. 1992. Decentralized constant-volume control of irrigation canals. In Feyen, J.; Mwendera, E.; Badji, M. (Eds.), Advances in planning, design and management of irrigation systems as related to sustainable land use: Proceedings of an International Conference organized by the Center for Irrigation Engineering of the Katholieke Universiteit Leuven in cooperation with the European Committee for Water Resources Management, Leuven, Belgium, 14-17 September 1992. Vol. 3. Leuven, Belgium: Center for Irrigation Engineering; In IIMI; CEMAGREF. International Workshop on The Application of Mathematical Modelling for the Improvement of Irrigation Canal Operation, October 26-30, 1992, Montpellier, France. pp.889-898; pp.317-327.
Irrigation canals ; Open channels ; Mathematical models ; Design ; Control methods ; Simulation models
(Location: IWMI-HQ Call no: 631.7.1 G000 FEY, IIMI 631.7.1 G000 IIM Record No: H014470)
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