A diagnostic model framework for water use in rice-based irrigation systems
A diagnostic model framework for water use in rice-based irrigation systems

Author: Wilfried Hundertmark

Publisher: IWMI

Published: 2003

Total Pages: 57

ISBN-13: 9290905298

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The paper presents a framework for water use in rice-based irrigation systems, which is based on linear programming (LP). This framework intends to facilitate improved understanding of a system's internal and external conditions and the constraints to productive use of the available land and water resources, and thereby create a reference for the assessment of the physical, economic and environmental performance of a given system. The framework is conceived as a tool that is used interactively in technical group sessions with farmers, system operators and extension workers, where structured discussions lead to improved data confidence, and understanding of complex irrigation systems.

Strategies for the Management of Conjunctive Use of Surface Water and Groundwater Resources in Semi-arid Areas
Strategies for the Management of Conjunctive Use of Surface Water and Groundwater Resources in Semi-arid Areas

Author: Asad Sarwar Qureshi

Publisher: IWMI

Published: 2004

Total Pages: 33

ISBN-13: 9290905794

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Due to inadequate rainfall, groundwater has acquired a vital role in the development of Pakistan's agricultural economy. However, a lack of awareness concerning the use of groundwater, either by itself or combined with canal water, has added large amounts of salt to the soil. As a result, large tracts of irrigated lands are already salinized, while many others are under threat. This report presents the results of a modeling study carried out to evaluate the long-term effects of a different quality of irrigation water on root zone salinity. The simulations were performed for the Rechna Doab (sub basin of the Indus Basin) in Pakistan, by using 15 years of actual rainfall and climatic data.

Sustainable Irrigation Development in the White Volta sub-Basin
Sustainable Irrigation Development in the White Volta sub-Basin

Author: Eric Antwi Ofosu

Publisher: CRC Press

Published: 2011-12-16

Total Pages: 282

ISBN-13: 0415621038

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Sub-Saharan Africa has an irrigation potential of about 42 million hectares of which only 17% is developed. Despite several investments in irrigation the growth is slow. This study aims at helping to achieve sustainable irrigation in sub-Saharan Africa, through gaining a better understanding of productive irrigation water use and effective management of irrigation development. The study is conducted in the White Volta sub-basin specifically in Northern Ghana and Southern Burkina Faso which have been experiencing rapid irrigation development since the mid 1990s. The study identified growing markets for irrigated products as an important driving force behind the expansion of irrigation which has given rise to new technologies. The new technologies have spread because they gave farmers direct control over water sources. These new technologies allow relatively small farm sizes which can be adequately managed by the surveyed farmers. As a result high productivities are achieved. The hydrological impact of upscaling irrigation in the sub-basin is sustainable and will maximize the overall benefits derived from water resources in the Volta Basin.

Simulating the hydrology of small coastal ecosystems in conditions of limited data
Simulating the hydrology of small coastal ecosystems in conditions of limited data

Author: Smakhtin, Vladimir U., Piyankarage, Sujeewa C., Stanzel, P., Boelee, Eline

Publisher: IWMI

Published: 2004

Total Pages: 36

ISBN-13: 9290905387

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The impacts of water resources and irrigation development need to be quantified in order to understand the environmental costs of such development activities. Complex data-intensive simulation methods are normally used for this purpose in the developed world. However, lack of reliable data prohibits the use of such models in developing countries where it is more practical to apply models with less data requirements. The report illustrates three applications of simple and pragmatic simulation models to small coastal water bodies in Sri Lanka and South Africa.

Small dams and social capital in Yemen: How assistance strategies affect local investment and institutions
Small dams and social capital in Yemen: How assistance strategies affect local investment and institutions

Author: Vermillion, Douglas Lynn, Al-Shaybani, S.

Publisher: IWMI

Published: 2004

Total Pages: 38

ISBN-13: 9290905379

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This report examines the development of eight small dam projects in the mountainous province of Al-Mahweet in north-central Yemen. The report also investigates how external assistance affects incentives for local people to invest in dam development and water delivery systems and also to create rules, property rights and institutional arrangements to manage the dam and water.

A Method to Identify and Evaluate the Legal and Institutional Framework for the Management of Water and Land in Asia
A Method to Identify and Evaluate the Legal and Institutional Framework for the Management of Water and Land in Asia

Author: Ian Hannam

Publisher: IWMI

Published: 2003

Total Pages: 37

ISBN-13: 929090528X

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By determining the capacity of relevant international, national and regional legislation to support sustainable use of water and land, planners, legislative drafters and policymakers have a basis for recommending legal and institutional reform. This report, based on an investigation into existing water- and land- management laws and issues in three countries in the region, offers a methodology that can be used for such evaluations.

An assessment of small-scale users' inclusion in large-scale water user associations of South Africa
An assessment of small-scale users' inclusion in large-scale water user associations of South Africa

Author: Faysse, Nicolas

Publisher: IWMI

Published: 2004

Total Pages: 45

ISBN-13: 9290905735

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The management of water resources is being transformed in South Africa. All water users, especially the small-scale ones, are now invited to participate in this movement. This report reviews the process of inclusion of small-scale users in the new large-scale Water User Associations (WUA).Considering the difficulties encountered in this process, this report also recommend external monitoring after the transformation of an Irrigation Board into a WUA. This method may also facilitate assessment of the inclusion of small-scale users into catchment management agencies, and water resource management organizations.

Irrigation Kuznets Curve, governance and dynamics of irrigation development: A global cross-country analysis from 1972 to 1991
Irrigation Kuznets Curve, governance and dynamics of irrigation development: A global cross-country analysis from 1972 to 1991

Author: Madhusudan Bhattarai

Publisher: IWMI

Published: 2004

Total Pages: 57

ISBN-13: 9290905239

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Using a global analysis across 66 countries, this study empirically validates the presence of an Environmental Kuznets Curve (EKC) relationship for irrigation development. The resulting inverted U-shaped relationship between the level of irrigation and income implies that, water uses in irrigation and agriculture are considered more important in the early stage of development of a society. Once the economy grows, however, the relative importance of irrigation and water uses in agriculture declines, compared to water uses in other sectors.

Prospects for adopting system of rice intensification in Sri Lanka: A socioeconomic assessment
Prospects for adopting system of rice intensification in Sri Lanka: A socioeconomic assessment

Author: Namara, Regassa E., Weligamage, Parakrama, Barker, Randolph.

Publisher: IWMI

Published: 2003

Total Pages: 56

ISBN-13: 9290905352

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Today, there is an increasing worldwide interest in assessing the potential for maintaining or increasing rice yields by reducing or eliminating the use of chemicals and by decreasing irrigation requirements. The System of Rice Intensification (SRI) first developed in Madagascar and now being tested in many countries, is an example of such an approach. The system is based largely on organic farming principles and additional requirements for spacing and the transplanting of seedlings.