Estimating Productivity Of Water At Different Spatial Scales Using Simulation Modeling
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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.
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.
Urban Wastewater
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Author : Wim van der Hoek
language : en
Publisher: IWMI
Release Date : 2002
Urban Wastewater written by Wim van der Hoek 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 Irrigation farming categories.
Farming communities in water-scarce regions increasingly practice the use of urban wastewater in agriculture. Untreated urban wastewater is generally considered unacceptable for direct use because of potential health risks. However, in many parts of the world, poor farmers in peri-urban areas use untreated wastewater. This situation is considered likely to continue even in the foreseeable future due to the high investment cost associated with the installation of treatment facilities.
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.
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.
Wells And Welfare In The Ganga Basin
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Author : Tushaar Shah
language : en
Publisher: IWMI
Release Date : 2001
Wells And Welfare In The Ganga Basin written by Tushaar Shah 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 Groundwater categories.
This report analyzes the history of groundwater development in the eastern Uttar Pradesh region over the 1950-1990 period. Its main conclusion is that the story of groundwater-based livelihood creation in the Ganga basin is one of failed public initiatives and successful adaptive responses by private agents. However, tube-well-induced agrarian dynamism in eastern Uttar Pradesh and north Bihar in recent years can spread to the entire basin if public policy makers learn correct lessons from the experience of these two subregions.
Smallholder System Innovations In Integrated Watershed Management Ssi
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Author : Yogesh Bhatt,
language : en
Publisher: IWMI
Release Date : 2006-09-04
Smallholder System Innovations In Integrated Watershed Management Ssi written by Yogesh Bhatt, and has been published by IWMI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-09-04 with Water-supply categories.
Rapidly increasing population in the dynamic semi-arid agro-ecosystems in sub-Saharan Africa (SSA) highlights the necessity to increase food production, while at the same time safe-guarding other ecological systems that support human development and well-being. In the past, increases in crop production to keep pace with population growth in this region were largely achieved through the expansion of cultivated area. Today, we must also consider ways of improving the productivity of already existing cropping systems. elopment-oriented research and describes the integrated research approach of the SSI program, its interconnected research projects - their scope and methodologies
9789290908487
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Author : Giordano, Meredith
language : en
Publisher: Colombo, Sri Lanka: International Water Management Institute (IWMI) Washington, DC, USA: The World Bank
Release Date : 2017-06-01
9789290908487 written by Giordano, Meredith and has been published by Colombo, Sri Lanka: International Water Management Institute (IWMI) Washington, DC, USA: The World Bank this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-06-01 with Technology & Engineering categories.
Poverty Dimensions Of Irrigation Management Transfer In Large Scale Canal Irrigation In Andra Pradesh And Gujarat India
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Author : Barbara C. P. Koppen
language : en
Publisher: IWMI
Release Date : 2002
Poverty Dimensions Of Irrigation Management Transfer In Large Scale Canal Irrigation In Andra Pradesh And Gujarat India written by Barbara C. P. Koppen 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, Size of categories.
A growing body of evidence on the impacts of irrigation management transfer (IMT) shows that IMT risks aggravating rural poverty. For governments that aim to continue irrigation management while ensuring that it contributes to poverty alleviation, a "pro-poor" mode of IMT needs to be designed and implemented. That is, a mode of IMT that benefits poor farmers while benefiting non-poor farmers equally, or perhaps to a lesser degree. The present research explores the scope for pro-poor modes of IMT in canal irrigation, focusing on large-scale canal irrigation schemes in India.
Land And Water Productivity Of Wheat In The Western Indo Gangetic Plains Of India And Pakistan
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Author : Intizar Hussain
language : en
Publisher: IWMI
Release Date : 2003
Land And Water Productivity Of Wheat In The Western Indo Gangetic Plains Of India And Pakistan written by Intizar Hussain and has been published by IWMI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Agricultural productivity categories.
The purpose of this study is to analyze variations in wheat yields and to assess the range of factors affecting wheat yields and profitability of wheat production in the selected irrigation systems in India and Pakistan. The study attempts to identify constraints and opportunities for closing the existing yield gaps. It is hypothesized that substantial gains in aggregate yields can be obtained by improved water management practices at the farm and irrigation-system levels.