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Analysis of slot orifice fishways Item Info

The object of this study was to develop design criteria for a slot orifice fishway. Sizing and spacing of slot orifices inside the fishway can be designed to create flow conditions satisfactory for fish passage. The slot orifice fishway will function well in a wide range of discharges and should not have any serious s i l t i n g problems. Values of drag coefficients for the slot orifice constrictions were evaluated by model studies for a range of slot openings varying from 0.6 t o 0.85 of fishway width and culvert slope varying from horizontal to five percent. Three longitudinal spacings, 4, 5, and 6 times the fishway width, were considered for the slot orifices in the fishway. The effect of tailwater on the flow conditions at the fishway entrance was studied. The backwater relation of the slot orifice also was developed in the above range. Nondimensional carves are given for the values of the drag coefficients of the slot orifice constrictions and also for the backwater relations for the slot orifices. An equation, based on momentum principle, is developed which enables the designer to find the rate of flow through the fishway. Necessary criteria regarding suitability of flow for fish passage are also developed.

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Title:
Analysis of slot orifice fishways
Authors:
Dass, Purushottam
Date Created (ISO Standard):
1970-12
Description:
The object of this study was to develop design criteria for a slot orifice fishway. Sizing and spacing of slot orifices inside the fishway can be designed to create flow conditions satisfactory for fish passage. The slot orifice fishway will function well in a wide range of discharges and should not have any serious s i l t i n g problems. Values of drag coefficients for the slot orifice constrictions were evaluated by model studies for a range of slot openings varying from 0.6 t o 0.85 of fishway width and culvert slope varying from horizontal to five percent. Three longitudinal spacings, 4, 5, and 6 times the fishway width, were considered for the slot orifices in the fishway. The effect of tailwater on the flow conditions at the fishway entrance was studied. The backwater relation of the slot orifice also was developed in the above range. Nondimensional carves are given for the values of the drag coefficients of the slot orifice constrictions and also for the backwater relations for the slot orifices. An equation, based on momentum principle, is developed which enables the designer to find the rate of flow through the fishway. Necessary criteria regarding suitability of flow for fish passage are also developed.
Subjects:
fish barriers fish ladders fish migration
Collection:
Boise Basin
IWRRI number:
197005
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
Publisher:
University of Idaho
Contributing Institution:
University of Idaho
Type:
Text
Format:
application/pdf
Cataloger:
wbv
Date Digitized:
2012

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Source
Preferred Citation:
"Analysis of slot orifice fishways", Idaho Waters Digital Library, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/iwdl/items/iwdl-197005.html
Rights
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
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