Physical modelling of preliminary design for Eidsvold Weir Spillway and Fishway

Engineers Australia
Publication Type:
Conference Proceeding
Proc. 8th National Conference on Hydraulics in Water Engineering, 2004, pp. 1 - 8
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This paper details two parallel physical model studies associated with the preliminary design for the proposed Eidsvold Weir project on the Burnett River in Queensland. The project incorporates a fishway to facilitate the migration of fish. A model of the entire spillway was constructed at a scale of 1:55 and a separate model of the fishway portion of the spillway was constructed at a scale of 1:12. The principal objectives of the spillway model were: to provide a faithful three dimensional visual presentation of the design; to determine a head versus discharge relationship; to identify downstream flow patterns and velocities; and to measure crest pressures over the weir. The fishway model simulated a prototype area of approximately 108 m long by 90 m wide in the vicinity of the fishway and outlet works, with its aim being to determine flow paths and velocities. Due to the complex flow patterns and interactions, it is contended that physical modelling provided the most economical, reliable and robust method of measurement of velocities downstream o f the weir.
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