2008 Volume 2008 Issue 258 Pages 529-534,a2
To perform function maintenance of irrigation canals, it is necessary and indispensable to execute overall function diagnosis and performance design for hydraulics and water serviceability in addition to the former structural function, and also necessary to set function maintenance measures. This report takes up the problem of declined hydraulic performance caused by explosively increased algae in irrigation canals in a paddy field irrigation district. The area where water overflows from the sidewall of an irrigation canal when algae grows thickly in large quantities is hypothesized by a hydraulic performance check method using non-uniform flow calculation. Therefore, 5 schemes for the overflow stream measures have been prepared. The optimal scheme is selected based on the calculation of life-cycle cost taking maintenance into consideration.