2010 Volume 16 Pages 5-10
People have questions why the river width has to be widen or levees to be set back although the space and capacity of rivers is large enough. River engineers are required to give explanations for their "why" so as for people to understand the future plan of flood control and river environment. Their interests are closely related to change in the width and shape of cross section of the river.
This paper deals with determination method of river width and cross section which satisfies the harmonization between flood control and river environment. Fukuoka’s equation is used for determination of width and cross section in rivers having severe management problems. Examples applied are how to manage and determine proper width and cross section for rivers with dense vegetation growth and bed degradation of channels.
