Analysis of a Skewed Slot Orifice

The object of this study was to develop design criteria for a skewed slot orificie fishway exit. Using these criteria the fishway exist can be constructed in culvert wingwalls. The outlet would terminate in a skew angle and be designed to create flow conditions necessary for fish passage. Values of slot orifice contraction rations varied from .65 to .82 of culvert width; culvert slope varied from .015 to .045; skew angles measured varied from thirty degrees to seventy-five degrees; three lateral positions of the fishway cahnnel were tested. Dimensional analysis wwas used to determine the significant design paramenters. Design curves displaying the relationship between the backwater ration h/h and the foude number are presented. The design curves and an equation based on the momentum principle are used to design two types of skewed orifice exists. One problem uses the same contraction ratio for the skweed exit and normal slot orificies placed downstream; the other uses different values of contraction ratio for the skwed exit and normal slot orificies downstream. Necessary criteria regarding suitability of flow for fish passage are also discusse