Operational Behaviour of Hydraulic Structures in Irrigation Canals in Sri Lanka

The Hydraulic performance of structures provided for regulation in irrigation canals is influenced by many parameters such as type of flow control, type and frequency of adjustments, and topographical features of sub-systems that they are installed. The irrigation systems in Sri Lanka mostly designed for up-stream discharge control operation, with manually/mechanically adjusted gated structures, under steady state flow conditions. Further, topographical features of many gravity irrigation systems are varying at sub-system level due to presence of single and double bank reaches, inclusion of in-lined storage tanks. However, irrigation systems are operated under varying flow regime due to scheduled or unscheduled flows in water delivery. The adjustments of gates in structures in such situations are done by manually/mechanically by operators at different frequencies. Therefore these situations are analyzed by hydraulic simulations using SIC hydraulic model for three different topographical sub-systems under different frequency of adjustments. The actual performance in water delivery is evaluated by effective volume of water delivered, timeliness in water delivery, at the final delivery location while maintaining on-line water adequacy through delivery points along the canal. The results will provide guidance for operation of regulation structures for effective conveyance of water under varying flow conditions

Generic typology for irrigation systems operation

This report presents a methodology for identifying the main characteristic features (constraints and opportunities) of gravity-fed irrigation systems, which influence management and operation of the system for the purpose of water delivery. It presents the development of a generic typology for improving irrigation system operations. A case study of 64 irrigation systems in Sri Lanka is presented illustrating the practical application of the proposed typology

Typologie des systemes et gestion des canaux d'irrigation application au Sri Lanka. In FrenchTypology and partition for irrigation system operation application in Sri Lanka

In Renault, D. (Ed.). Modern techniques for manual operation of irrigation canals. Proceedings of the Fourth International ITIS [Information Techniques for Irrigation Systems] Network Meeting, Marrakech, Morocco, 25-27 April 199

Typology and partition for irrigation system operation application in Sri Lanka

In Renault, D. (Ed.). Modern techniques for manual operation of irrigation canals. Proceedings of the Fourth International ITIS [Information Techniques for Irrigation Systems] Network Meeting, Marrakech, Morocco, 25-27 April 199

Improved irrigation system operation through subsystem approach

In ICID, 17th Congress on Irrigation and Drainage, Granada, Spain, 1999: Water for Agriculture in the Next Millennium - Transactions, Vol.1A, Q.48: Irrigation under conditions of water scarcity; Q.48.1: Management of irrigation systems and strategies to optimize the use of irrigation water; 48.2: Techniques to promote water saving in irrigation. New Delhi, India: ICI

National Conference on Irrigation for Food Security Voluume 1; Proceedings on Water, Food Security and Climate Change in Sri Lanka, EMICH, Colombo, June 9-11, 2009

Food security, Climate change, River basins, Water shortage, Irrigated farming, Water quality, Tanks, Aquatic plants, Rice, Food insecurity, Water resource management, Zero tillage, Weed control, Agroforestry, Canals, Surface runoff, Remote sensing, Agricultural and Food Policy, Environmental Economics and Policy, Food Consumption/Nutrition/Food Safety, Food Security and Poverty, Livestock Production/Industries, Resource /Energy Economics and Policy,

Proceedings of the National Conference on Water, Food Security and Climate Change in Sri Lanka, BMICH, Colombo, Sri Lanka, 9-11 June 2009. Vol. 1. Irrigation for food security

This is the first volume on the proceedings of the national conference on ?Water for Food and Environment?, which was held from June 9?11, 2009 at the Bandaranaike Memorial International Conference Hall (BMICH). The volumes two and three have been produced as separate documents of this report series. In response to a call for abstracts, 81 abstracts were received from government institutes dealing with water resources and agriculture development, also from universities, other freelance researchers and researchers from the International Water Management Institute (IWMI).Forty Seven of the eighty-one abstracts that were submitted were accepted for compiling full papers.In the past couple of years the sharp increase in food prices worldwide has raised serious concerns about food security, especially in developing countries. To effectively address these concerns a holistic approach is required that encompasses improved agricultural water productivity, adaptation to climate change, targeted and appropriate institutional and financial measures, and a consideration of environmental issues. The main purpose of the conference was to share experiences in these areas and to find opportunities to improve farmers? incomes and food production, and to promote environmentally sustainable practices in Sri Lanka in the face of growing water scarcity and the challenges of climate change