Experience in Fish Passage in France: Fish Pass Design Criteria and Downstream Migration Problems
Proceedings of the International Symposium on Fishways '90 in Gifu, Japan
The author outlines in this paper the functional features and design parameters used for the different fish facilities (Denil and pool fish passes, fish elevators). Emphasis is placed on the importance of conceiving, as far as possible, self-cleaning facilities which do not require any control with upstream or downstream water level fluctuations. Based on statistical analysis of experiments on fish transit through hydraulic turbines, models for predicting potential fish mortalities are formulated for FRANCIS and KAPLAN runners. Most recent experiments on downstream migration problems concern the use of surface gates to bypass juveniles around powerhouse intakes. Lights have been tested to try to improve the efficiency of such bypasses.