Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 81 for “"irrigation systems"”.
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Wick irrigation systems for subsistence farming
Irrigation on small-scale farms has been noted as a key method to help lift subsistence farmers out of poverty. With water scarity growing around the globe and lack of access to electricity still prevalent in rural areas, the need to develop an energy efficient irrigation system that simultaneous …
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Short term planning and operation of irrigation systems
… developments. This is especially true for irrigation systems. This emphasis is mainly due to limited funds available for construction works, lack of suitable hydrologic sites, and the spirited and justifiable lobbying of enviromnental groups against construction of new projects. Hence to …
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Automated Water Management for Center Pivot Irrigation Systems
… package that fully automates center pivot irrigation systems on fields planted to com, soybeans and potatoes for years 1986-2005. A total of seven sites from the Central and Northern Plains were chosen for analysis (Akron, CO, Ames, lA, Brookings, SD, Oakes, ND, Ord, NE, Rock Port, MO, and …
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Evaluation parameters for computer aided design of irrigation systems
… of computer models for the design of pressurized irrigation systems. Particular emphasis has been given to the provision of routines for the evaluation of the expected performance from a designed system. Two separate sets of models have been developed, one for the block or in-field system and one …
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A cost optimization of solar-powered, drip irrigation systems
… and cost optimization for solar-powered, drip irrigation systems. Historical irradiance data and crop consumption data are considered and modelled during these design steps. A cost optimization is utilized in order to determine low-cost, optimum configuration that meets the required water …
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An analysis of water consumption rates in agricultural irrigation systems
… of the high water consumption rates found in irrigation systems which use projectile-type sprinkler heads, the history and evolution of irrigation systems is discussed. The effect of evaporation is studied as as explanation for the water losses, but it is found to be insignificant. Having …
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SUPPORTING TRANSITIONS TO RESILIENT IRRIGATION SYSTEMS: FINDINGS FROM SOUTHERN KYRGYZSTAN
… to support more “resilient” community-managed irrigation systems. Findings suggest that current NGO partnerships with Water User Associations (WUAs) frequently amount to financial and technical transactions, to preserve inherited infrastructure and resist disturbance. “Enhancing resilience” is …
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SUPPORTING TRANSITIONS TO RESILIENT IRRIGATION SYSTEMS: FINDINGS FROM SOUTHERN KYRGYZSTAN
… to support more “resilient” community-managed irrigation systems. Findings suggest that current NGO partnerships with Water User Associations (WUAs) frequently amount to financial and technical transactions, to preserve inherited infrastructure and resist disturbance. “Enhancing resilience” is …
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A methodology for assessing the feasibility of riparian-based irrigation systems
… that determines the economic feasibility of irrigation and determines the instantaneous pumping demand and seasonal water use of feasible irrigation systems was developed. A 54 year (1930-1983) precipitation record was used to determine the future probability of drought occurring in a …
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The development and application of analytical techniques for planning of irrigation systems
Computer-based techniques for assessment of irrigation water supply and demand are illustrated using a 140 x 75 km discrete element representation of the Canterbury Plain, New Zealand. A versatile soil moisture accounting model is developed and used to simulate soil moisture status throughout the …
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Collector size effect on the measurement of applied water depth from irrigation systems
Center pivot irrigation systems are used in crop production across the state of Kansas. The American Society of Agricultural and Biological Engineers (ASABE) standard on uniformity testing of a center pivot system calls for collectors to be used to measure the water depth emitted by the irrigation …
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Transaction Cost Economics of Rice Irrigation Systems in Tanzania: Implications for Collective Action
… aspects in a collective action (CA) on irrigation systems of Tanzania have not been given sufficient attention. Consequently, smallholder rice irrigation systems, which are either traditional improved or modern schemes, perform poorly in operations and maintenance of infrastructures, …
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Design for Low Power Irrigation Systems for Small Plot Farming in Eastern India
irrigation on small-scale farms (~ 1 acre) in Eastern India. The pump is part of a larger irrigation system powered by 300 watts of solar panels and includes batteries as an energy buffer. The pump was designed for and achieved a performance point of 13 gal/min and a pressure head of 1 bar and …
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Parametric design and performance validation of low-cost, low-pressure drip emitters and irrigation systems
… to reduce the cost and energy use of drip irrigation systems, with the aim of increasing their adoption among smallholder farmers. By 2050, the growing world population will require a 55% increase in food production above 2010 levels. Yet, agriculture already places a large strain on the …
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ESTABLISHMENT OF TURFGRASS FROM SEED AND SOD IN SAND BASED SYSTEMS COMBINING SPRINKLER AND SUBSURFACE DRIP IRRIGATION SYSTEMS
… establishment of turfgrass using subsurface drip irrigation (SDI) in sand based media has limited success. However, it is unknown if starting with overhead (sprinkler) irrigation and transitioning to SDI can enhance turfgrass establishment. Two experiments were conducted at Stephen F. Austin State …
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Lowering the cost of solar-powered drip irrigation systems for smallholder farmers through systems-level modeling, optimization, and field testing
… is to lower the cost of solar-powered drip irrigation systems and thus make them more accessible to smallholder farmers, who operate farms that are less than 2 ha and normally located in rural communities. Current solar-powered drip irrigation systems that are conventionally sized are …
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Pump-sizing software tool for small-scale solar-powered irrigation systems in water-scarce conditions : a case study in Uttar Pradesh
Two small-scale well-irrigation systems in rural Uttar Pradesh which had previously operated via diesel pumps have been modified to operate via solar pumps. The regions where the irrigation systems are located are currently experiencing drought, and the well of one of the systems runs dry during …
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Property Rights Or Property Wrong: Do Property Rights Matter In Household Access To Irrigation Water? Evidence From Mid-hills, Nepal
Whilst the development of irrigation infrastructure has been proposed as a vehicle for poverty reduction in many developing countries, the distributional aspects of irrigation interventions, particularly households’ level of access to irrigation water have rarely been explored. Furthermore, …
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