Optimal allocation of limited water supply for a large-scale irrigated area - case study
Date
2006-10
Authors
Zaccaria, Daniele, author
Marjang, Nat, author
U.S. Committee on Irrigation and Drainage, publisher
Journal Title
Journal ISSN
Volume Title
Abstract
A study is conducted on a large-scale pressurized irrigation scheme located in southern Italy. The ultimate goal is identifying optimal allocation of limited available water supplies under the existing cropping pattern scenario and infrastructures. The irrigation scheme was originally designed some 30 years ago to allow extensive agricultural development for the area. Nevertheless, major changes in cropping patterns occurred. As a result, the current operating conditions and irrigation demand patterns are different from the original design. Different levels of limitation in water resources are considered to account for climatic trends. Crop irrigation requirements were preliminarily mapped, under three different climatic conditions. Then the allocations of different levels of limited water supply are analyzed. Economic objectives as well as physical, social and environmental constraints are considered using optimization model. Tariff rules for irrigation water are discussed as related to different water management options. Optimal conjunctive use of surface and groundwater for the different time periods of the irrigation season are also analyzed. Based on the results, practical recommendations about the operation of the existing infrastructures as well as modernization options are provided. Results indicate the importance of data monitoring, data interpretation and the need for quantitative-based models to improve decision-making and the economic sustainability of irrigated agriculture.
Description
Presented at Ground water and surface water under stress: competition, interaction, solutions: a USCID water management conference on October 25-28, 2006 in Boise, Idaho.