Using Remote Sensing Techniques To Evaluate Lining Efficacy Of Watercourses
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Using Remote Sensing Techniques To Evaluate Lining Efficacy Of Watercourses
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Author : R. Sakthivadivel
language : en
Publisher: IWMI
Release Date : 2001
Using Remote Sensing Techniques To Evaluate Lining Efficacy Of Watercourses written by R. Sakthivadivel and has been published by IWMI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Integrated water development categories.
Studies the low-cost alternative strategy of selective lining of watercourses to reduce seepage and increase irrigated areas in the Indian subcontinent. Satellite remote-sensing (SRS) is seen as a cost-effective evaluation tool in view of its large area of synoptic and repetitive coverage.
Center Commissioned External Review Of Iwmi Research Theme 1 Agricultural Water Management
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Author : John Langford
language : en
Publisher: IWMI
Release Date :
Center Commissioned External Review Of Iwmi Research Theme 1 Agricultural Water Management written by John Langford and has been published by IWMI this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Valuing Water In Irrigated Agriculture And Reservoir Fisheries
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Author : Mary E. Renwick
language : en
Publisher: IWMI
Release Date : 2001
Valuing Water In Irrigated Agriculture And Reservoir Fisheries written by Mary E. Renwick and has been published by IWMI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Fisheries categories.
Although irrigation projects often provide water for more than crop irrigation, water allocation and management decisions often do not account for nonirrigation uses of water. Failure to account for the multiple uses of irrigation water may result in inefficient and inequitable water allocation decisions. Decision-makers often lack information on the relative economic contributions of water in irrigation and nonirrigation uses. This report addresses this problem. It examines the relative economic contributions of irrigated agriculture and reservoir fisheries in the Kirindi Oya irrigation system, located in Southeastern Sri Lanka. The results of the analysis indicate the importance of both irrigated paddy production and reservoir fisheries to the local economy. They also demonstrate significant potential financial and economic gains to irrigated agriculture from improvements in water management practices. Since these water uses are interdependent, policy makers must consider how changes in water management practices may affect reservoir levels and water quality and the fisheries that depend on them.
Estimating Productivity Of Water At Different Spatial Scales Using Simulation Modeling
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Author : Peter Droogers
language : en
Publisher: IWMI
Release Date : 2001
Estimating Productivity Of Water At Different Spatial Scales Using Simulation Modeling written by Peter Droogers and has been published by IWMI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Hydrologic models categories.
A clear understanding of the current water balance is required to explore options for water saving measures. However, measurement of all the terms in the water balance is infeasible in terms of spatial and temporal scale, but hydrological simulation models can fill the gap between measured and required data. For a basin in Western Turkey, simulation modeling at three different scales, field, irrigation scheme and basin scale, was performed to obtain all terms of the water balance. These water balance numbers were used to calculate the Productivity of Water at the three spatial levels distinguished to assess the performance of the systems.
More Crop Per Drop
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Author : Meredith Giordano
language : en
Publisher: IWA Publishing
Release Date : 2007-01-01
More Crop Per Drop written by Meredith Giordano and has been published by IWA Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-01-01 with Science categories.
This volume is an analytical summary and a critical synthesis of research at the International Water Management Institute over the past decade under its evolving research paradigm known popularly as 'more crop per drop'. The research synthesized here covers the full range of issues falling in the larger canvas of water-food-health-environment interface. Besides its immediate role in sharing knowledge with the research, donor, and policy communities, this volume also has a larger purpose of promoting a new way of looking at the water issues within the broader development context of food, livelihood, health and environmental challenges. More crop per drop: Revisiting a research paradigm contrasts the acquired wisdom and fresh thinking on some of the most challenging water issues of our times. It describes new tools, approaches, and methodologies and also illustrates them with practical application both from a global perspective and within the local and regional contexts of Asia and Africa. Since this volume brings together all major research works of IWMI, including an almost exhaustive list of citations, in one single set of pages, it is very valuable not only as a reference material for researchers and students but also as a policy tool for decision-makers and development agencies.
Basin Level Use And Productivity Of Water
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Author : David Molden
language : en
Publisher: IWMI
Release Date : 2001
Basin Level Use And Productivity Of Water written by David Molden and has been published by IWMI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Integrated water development categories.
Discusses and illustrates concepts for identifying ways of improving productivity of water within basins. The results of applying a water accounting procedure to four sub-basins in South Asia (Bhakra in India; Chishtian in Pakistan; Huruluwewa in nothern Sri Lanka; and Kirindi Oya in southern Sri Lanka) are presented. The methodology used identifies the quantities and productivity of various uses of water within a basin. This information is then used to identify the water-saving potential, and the means of improving the productivity of the managed supplies.
Hydronomic Zones For Developing Basin Water Conservation Strategies
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Author : D. J. Molden
language : en
Publisher: IWMI
Release Date : 2001
Hydronomic Zones For Developing Basin Water Conservation Strategies written by D. J. Molden and has been published by IWMI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Irrigation categories.
In this report, the concept and procedures of hydronomic (hydro water + nomus management) zones are introduced. A set of six hydronomic zones are developed and defined based on key differences between reaches or areas of river basins. These are the: Water Source Zone, Natural Recapture Zone, Regulated Recapture Zone, Stagnation Zone, Final Use Zone, and Environmentally Sensitive Zone. The zones are defined based on similar hydrological, geological and topographical conditions and the fate of water outflow from the zone. In addition, two conditions are defined which influence how water is managed: whether or not there is appreciable salinity or pollution loading; and whether or not groundwater that can be used for utilization or storage is present. Generic strategies for irrigation for four water management areas, the Natural Recapture, Regulated Recapture, Final Use, and Stagnation Zones, are presented. The Water Source Zone and Environmentally Sensitive Zone are discussed in terms of their overall significance in basin water use and management.
Modeling Scenarios For Water Allocation In The Gediz Basin Turkey
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Author : G. W. Kite
language : en
Publisher: IWMI
Release Date : 2001
Modeling Scenarios For Water Allocation In The Gediz Basin Turkey written by G. W. Kite and has been published by IWMI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Irrigation categories.
Describes the use of a distributed hydrologic model to evaluate different data scenarios. The study attempted to answer questions such as; what will happen to the basin water resources if a) there is a change in climate; b) it is decided that more water must be retained in the river for environmental reasons; c) more water is extracted for urban and industrial use; d) the timing and accounts used for water are changed?
Predicting Water Availability In Irrigation Tank Cascade Systems
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Author : C. J. Jayatilaka
language : en
Publisher: IWMI
Release Date : 2001
Predicting Water Availability In Irrigation Tank Cascade Systems written by C. J. Jayatilaka and has been published by IWMI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Irrigation categories.
Better water management in irrigation tank cascade systems is vital in achieving higher productive use of available water. To develop and implement management practices aimed at improving effective use of water, studies leading to the development of models that can predict available tank water in irrigation tank cascade systems are invaluable. This report presents a simple water balance model, Cascade, developed to predict tank water availability in the Thirappane tank cascade system in Anuradhapura, Sri Lanka. The report includes calibration of the model and its application to predict tank water availability for rice crops over a 10-year period.
Fundamentals Of Smallholder Irrigation
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Author : B. Albinson
language : en
Publisher: IWMI
Release Date : 2002
Fundamentals Of Smallholder Irrigation written by B. Albinson and has been published by IWMI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Farms, Small categories.
Smallholder irrigation systems–where farm sizes generally range from a fraction of a hectare to 10 hectares–pose special management problems, especially where the water available for irrigation is frequently less than the demand. The intensity of system adjustments required to meet individual farmer demands, and the administrative complexity of measuring and accounting water deliveries have generally proven excessive when attempting to meet “on demand†schedules, resulting in chaos (often characterized by illegal tampering with infrastructure, and vast differences of water use intensity at different locations in the system). The alternative–provision of a simple service, based on proportional sharing of available supplies on the basis of landholdings–has been resilient for many years over vast areas. The approach is based on a clear delineation between the part of the irrigation system that is actively managed (at various flow rates and water levels) and the part of the system that operates either at full supply level (with proportional division of water down to the level at which farmers rotate among their individual farms), or is completely shut. This operational design is known as a “structured†system, and has well-defined hydraulic characteristics, simplifying operation and management, in turn allowing a clearer definition of water entitlements and the responsibilities of agency staff and farmers. The approach is particularly suited to areas where water is scarce and discipline is needed to ration water among users. An additional benefit, which has been demonstrated in modeling studies using a well–proven model relating to water and yield, is that the productivity of water (which is more important than the more traditional productivity of land when water is scarce) is substantially increased when deficit irrigation is practiced–a widely observed and predictable response to rationed water supplies. Structured systems are most suited where water is scarce, clear definition of water entitlements is needed, management capacity is limited, and investment resources are limited. The approach to determining critical aspects of a structured system design is described in this report.