ABSTRACT
Water and the Environment: Innovative Issues in Irrigation and Drainage. Edited by Luis S. Pereira and John W. Gowing. Published in 1998 by E & FN Spon. ISBN 0419 23710 0
create a controlled water pattern transporting water from its source to a user which is generally far away. Canals must maintain over time the original controlled pattern, and avoid that by their deterioration a more random, diffuse and uncontrolled water distribution pattern is established, which can be dangerous to the environment.
