Your search found 66 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 Corey, G. L.; Clyma, W.. 1975. Improving farm water management in Pakistan. Fort Collins, CO, USA: Colorado State University. iv, 32p. (Water management technical report no. 37 / Pakistan field report no.1)
On farm research ; Water management ; Water conveyance ; Irrigation scheduling ; Evaluation ; Irrigated farming / Pakistan
(Location: IWMI-HQ Call no: 631.7.6.2 G730 COR Record No: H0333)
4 Lowdermilk, M. K.; Clyma, W.; Haider, M.; Laltimore, D. L.; Layton, J. J.; Lybecker, D. W.; Madsen, A. G.; Nelson, L. J.; Redgrave, D. J.; Sutoplo, F. A.; Sunada, D. K. 1981. Monitoring and evaluation manual: Diagnostic analysis on farm irrigation systems. 2 vols. Fort Collins, CO, USA: Colorado State University. xii, 186p.; iv, 349p.
(Location: IWMI-HQ Call no: P 631 Record No: H0354)
5 Lowdermilk, M. K.; Clyma, W.; Early, A. C. 1975. Physical and socio-economic dynamics of a watercourse in Pakistan's Punjab: System constraints and farmers' responses. Fort Collins, CO, USA: Colorado State University. viii, 106 p. (Water management technical report no. 42)
(Location: IWMI-HQ Call no: 631.7.6.2 G730 LOW Record No: H0323)
(6.66 MB)
6 Bowers, S. A.; Clyma, W.; Johnson, S. H.; Kemper, W. D.; Reuss, J. O. 1977. Watercourse improvement in Pakistan: Pilot study in cooperation with farmers at Tubewell 56L. Fort Collins, CO, USA: Colorado State University. xv, 93p. (Water management technical report no.45)
(Location: IWMI-HQ Call no: 631.7.7 G730 BOW Record No: H0335)
Over half of the water supplied to the watercourse at Tubewell 56L was lost before it reached the farmer's fields. This loss was primarily through the upper porous portions of the banks and in the vicinity of junctions where banks were thin. The 35 farmers in the 900-acre area served by this watercourse were motivated to organize themselves to rebuild their own earthen watercourse, according to specifications drawn up by Pakistani engineers. Low cost concrete diversion structures were developed and installed at junctions to eliminate continued burrowing of soil and degradation of banks near the junctions. The improvements reduced losses to about one-half their previous values and increased deliveries to the fields by over 50 percent. This watercourse improvement appears to be an ideal component for a development program designed to increase crop production. However, farmers require further information on how to use this water and other inputs to optimize crop production if they are to obtain full benefits from this extra water.
7 Kemper, W. D.; Clyma, W.; Skogerboe, G. V.; Trout, T. J. 1980. Watercourse improvement research in Pakistan. Fort Collins, CO, USA: Colorado State University. xiii, 93p. (Water management technical report no.56)
Watercourses ; Farmer participation ; Tube well irrigation ; Design ; Research ; Investment ; Water loss / Pakistan
(Location: IWMI-HQ Call no: 631.7.7 G730 KEM Record No: H0336)
This research program was funded by USAID, organized by CSU and sent out to identify good investments for developing countries in water management. Loss of almost half of the water from watercourses was identified as a primary waste of irrigation water which is a limiting factor in crop production in Pakistan. Physical causes of the loss were identified as high porosity of upper portions of the banks due to burrowing of soil for weekly construction of dams, and rising levels of water in the watercourse due to vegetative growth and sedimentation. Difficulty in organizing farmers to accomplish regular cleaning and repair was identified as an underlying sociologic cause of the loss. Experimental masonry and concrete watercourses were built by the government and given to the farmers. They were too expensive to provide a nationwide solution. The farmers did not appreciate and maintain them because they had no investment therein. Other lined watercourses on which the government paid for materials and the farmers provided labor were better appreciated and maintained, but took longer to build and still required large amounts of cement and were too costly for a national program. Cooperative improvement of the earthen channels by the farmers with the government providing the materials and design for concrete control structures at the junctions was developed as a program which had a benefit:cost ratio of at least 3 to 1 and was eagerly accepted by the farmers in a study which involved a series of case histories. Subsequent studies indicated that a good and regular cleaning and repair program would save almost as much water and provide higher benefits with much lower government input. However, the watercourse improvement plan with its concrete control structures was more eagerly accepted by the farmers. Full benefits of the improvement were obtained only by those farmers who organized themselves to clean and maintain their watercourses regularly.
8 Eckert, J.; Dimick, N.; Clyma, W.. 1975. Water management alternatives for Pakistan: A tentative appraisal. Fort Collins, CO, USA: Colorado State University. vii, 61p. (Water management technical report no.43 / Pakistan field report no.5)
Watercourses ; Development ; Investment ; Water loss ; Irrigation efficiency ; Water user associations ; Maintenance ; Land management ; Water management / Pakistan
(Location: IWMI-HQ Call no: 631.7.8 G730 ECK Record No: H0331)
9 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)
10 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)
11 Keller, J.; Clyma, W.; Drosdoff, M.; Lowdermilk, M. K.; Seckler, D. 1981. Irrigation development options and investment strategies for the 1980's: India. Logan, UT, USA: Utah State University. 162p. (Water management synthesis report no.6)
Policy ; Irrigated farming ; Investment ; Agriculture ; Water delivery ; Training ; Irrigation scheduling ; Water resources development / India
(Location: IWMI-HQ Call no: 631.7.8 G635 KEL Record No: H0509)
12 Jayaraman, T. K.; Lowdermilk, M. K.; Clyma, W.. 1982. Command area development authorities for improved water management. Fort Collins, CO, USA: Water Management Synthesis Project. Colorado State University. iii, 33p. (Water management synthesis report no.8)
(Location: IWMI-HQ Call no: 631.7.8 G635 JAY Record No: H0503)
13 Griffin, R. E.; Hargreaves, G. H.; Lattimore, D.; Clyma, W.; Keller, J.; Velder, D.; Fitzgerald, L. W. 1982. Irrigation pumping. Fort Collins, CO, USA: Colorado State University. 23 p. (Water Management Synthesis Project Planning Guide 3)
Planning ; Pumps ; Irrigation engineering ; Water supply ; Training ; Irrigation management / Asia / Africa
(Location: IWMI-HQ Call no: 631.7.1 G000 GRI Record No: H0577)
14 Clyma, W.; Ali, A.; Ashraf, M. 1975. Irrigation practices and application efficiencies in Pakistan. Bhalwal, Pakistan: Directorate of Mona Reclamation Experimental Project. 33 p. (Water and Power Development Authority publication no. 36)
Irrigation efficiency ; Irrigation practices ; Water management ; Water supply ; Canals ; Tube wells / Pakistan
(Location: IWMI-HQ Call no: 631.7.6.2 G730 CLY Record No: H0598)
15 Clyma, W.; Keller, J.; Lowdermilk, M.; Lattimore, D.; Velder, D.; Corey, G. 1981. Land leveling. Fort Collins, CO, USA: Colorado State University. 40p. (Water management synthesis project planning guide no.1)
(Location: IWMI-HQ Call no: 631.7.6.2 G000 CLY Record No: H0672)
Also available in French under the title Nivellement.
16 Lattimore, D.; Clyma, W.; Keller, J.; Lowdermilk, M.; Madsen, A.; Corey, G. 1980. Diagnostic analysis of farm irrigation systems: Training programme. Fort Collins, CO, USA: Colorado State University. 16p.
(Location: IWMI-HQ Call no: 631.7.6.2 G000 LAT Record No: H0674)
17 Lattimore, D.; Clyma, W.; Nelson, L.; Fitzgerald, W. 1983. Diagnostic analysis workshop: Water management synthesis project. Fort Collins, CO, USA: Colorado State University. 16 p.
(Location: IWMI-HQ Call no: 631.7.6.2 G000 LAT Record No: H0673)
18 Lattimore, D.; Lowdermilk, M.; Freeman, D.; Zimmerman, D.; Clyma, W.; Keller, J.; Velder, D.; Corey, G. 1981. Farmer involvement. Fort Collins, CO, USA: Colorado State University. 39p. (Water management synthesis project planning guide no.2)
(Location: IWMI-HQ Call no: 631.7.6.2 G000 LAT Record No: H0671)
19 Griffin, R. E.; Hargreaves, G. H.; Lattimore, D.; Clyma, W.; Keller, J.; Velder, D.; Fitzgerald, L. W. 1982. Irrigation pumping. Fort Collins, CO, USA: Colorado State University. 23p. (Water Management Synthesis Project Planning Guide 3)
Planning ; Pumps ; Irrigation engineering ; Water supply ; Training ; Irrigation management / Asia / Africa
(Location: IWMI-HQ Call no: 631.7.1 G000 GRI c2 Record No: H0670)
20 Keller, J.; Clyma, W.; Drosdoff, M.; Lowdermilk, M. K.; Seckler, D. 1981. Irrigation development options and investment strategies for the 1980's: Thailand. Logan, UT, USA: Utah State University. 95p. (Water management synthesis report no.5)
Irrigated farming ; Development ; Water resource management ; Policy ; Irrigation programs ; Technology transfer / Thailand
(Location: IWMI-HQ Call no: 631.7.8 G750 KEL Record No: H0692)
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