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Author: Robert Chambers
Publisher: Cambridge University Press
ISBN: 9780521347884
Category : Nature
Languages : en
Pages : 312
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Book Description
A challenge to re-examine beliefs, biases and actions is presented through the exposure of misleading research and faulty diagnosis in the current policies and pratices of canal irrigation.
Author: Robert Chambers
Publisher: Cambridge University Press
ISBN: 9780521347884
Category : Nature
Languages : en
Pages : 312
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Book Description
A challenge to re-examine beliefs, biases and actions is presented through the exposure of misleading research and faulty diagnosis in the current policies and pratices of canal irrigation.
Author: Sib Ranjan Misra
Publisher: Concept Publishing Company
ISBN: 9788170228141
Category : Irrigation
Languages : en
Pages : 172
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Book Description
This Book Attempts An Account Of The Status Of Water Distribution, Issues Associated With Irrigation Projects, Socio-Economic And Environmental Consquences Of Maldistribution And People`S Participation In Irrigation Projects.
Author: Robert Chambers
Publisher: IWMI
ISBN:
Category :
Languages : en
Pages : 31
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Book Description
Author: D. J. Bandaragoda
Publisher: IWMI
ISBN: 9290903872
Category : Irrigation
Languages : en
Pages : 42
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Book Description
This report is based on the results of an action research program in pakistan conducted by the International Water Managament Institute (IWMI). An analysis of empirical data is presented in the light of existing theoretical kmowledge on collective action for natural resources management. the report also highlights the current constraints associated with a wider application of some of these findings, which reflect the difficulties in pursuing large-scale institutional reforms in the rural sector of developing coutries. finally, the report raises some key research issues that need to be explored further.
Author: Krishna P. Paudel
Publisher: CRC Press
ISBN: 9780415615792
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
The performance of irrigation schemes that carry sediment laden water is often poor. Modern irrigation schemes are increasingly demand based, which means that the water flow in the canals is determined by the crop water requirements. Accordingly the flow in the canal network is not constant as the crop water requirement changes with the climate and the growing stages. Also the inflow of the sediment is not constant throughout the irrigation season. Such schemes, particularly having unlined canals in alluvial soils, are difficult to design and to manage without compromising the flexibility or maintenance cost. This research has made an in-depth assessment on the role of sediment in the design and management of an irrigation scheme by using the data of Sunsari Morang Irrigation Scheme, Nepal. An analysis of the velocity and shear stress distribution across a non-wide trapezoidal canal has been made to derive the correction factor for the sediment transport predictors. An improved approach based on a rational concept of the design of canals for sediment transport is proposed. By using the sediment transport model SETRIC, a water delivery plan has been designed and tested for changing water and sediment inflow conditions that can be implemented with the existing canal infrastructure. The research also shows that flexibility of operation and efficient sediment management are difficult to achieve at the same time. A compromise has to be made and this needs to be reflected in the design. All methods to transport, exclude or extract the sediment are temporary measures and just transfer the problem from one place to the other. A better understanding of sediment movement helps to identify the problems beforehand and to find the best possible solutions.
Author: Barbara C. P. Koppen
Publisher: IWMI
ISBN: 9290904801
Category : Farms, Size of
Languages : en
Pages : 36
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Book Description
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.
Author: Brian Wahlin
Publisher:
ISBN: 9780784413685
Category : Canals
Languages : en
Pages : 0
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Book Description
Prepared by the Task Committee on Recent Advances in Canal Automation of the Irrigation Delivery and Drainage Systems Committee of the Irrigation and Drainage Council of the Environmental and Water Resources Institute of ASCE Canal Automation for Irrigation Systems focuses on the technical aspects of modernizing irrigation systems through use of automated canal control systems. Canal automation has always offered an opportunity to save water and improve the efficiency of irrigation water supply projects or irrigation district operations. Recent technological and engineering advances now enable more accurate control of water deliveries throughout all parts of an irrigation project. Using information collected from irrigation systems around the world in conjunction with new advances in control theory research, this Manual of Practice examines how and when to implement canal automation within the context of canal modernization. Topics include: the modernization process, constraints, and concepts; survey of irrigation physical infrastructure; SCADA systems; control operation concepts; canal hydraulic properties; control methods; verification of controller performance; and implementation of control systems. MOP 131 is an essential reference for professionals in agricultural and irrigation engineering, as well as owners, managers, and operators of irrigation water delivery systems.
Author: Herman Depeweg
Publisher: CRC Press
ISBN: 1138026956
Category : Science
Languages : en
Pages : 314
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Book Description
Sediment transport in irrigation canals influences to a great extent the sustainability of an irrigation system. Unwanted erosion or deposition will not only increase maintenance costs, but may also lead to unfair, unreliable and unequitable distribution of irrigation water to the end users. Proper knowledge of the characteristics, including behaviour and transport of sediment will help to design irrigation systems, plan effi cient and reliable water delivery schedules, to have a controlled deposition of sediments, to estimate and arrange maintenance activities, etc. The main aim of these lecture notes is to present a detailed analysis and physical and mathematical descriptions of sediment transport in irrigation canals and to describe the mathematical model SETRIC that predicts the sediment transport, deposition and entrainment rate as function of time and place for various flow conditions and sediment inputs. The model is typically suited for the simulation of sediment transport under the particular conditions of non-wide irrigation canals where the flow and sediment transport are strongly determined by the operation of the flow control structures. The lecture notes will contribute to an improved understanding of the behaviour of sediments in irrigation canals. They will also help to decide on the appropriate design of the system, the water delivery plans, to evaluate design alternatives and to achieve an adequate and reliable water supply to the farmers.
Author:
Publisher: Int. Rice Res. Inst.
ISBN: 9711040271
Category :
Languages : en
Pages : 169
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Book Description
Author:
Publisher: IWMI
ISBN:
Category :
Languages : en
Pages : 72
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Book Description
