Author(s): S. A. Servais; D. G. Rhodes; G. S. Armstrong
Linked Author(s):
Keywords: Fish pass. Crump weir. Flow gauging
Abstract: This paper firstly describes the project plan to develop low-cost modifications to Crump-type weirs in order to improve fish passage while preserving the hydrometric function, and secondly presents some initial results from the laboratory work. For the latter, a single arrangement of baffles on a 1:5 scale model Crump weir is investigated for one flow by measuring free surface profiles and velocity distributions in selected locations. Conditions between the crest and the most upstream baffle are identified as crucial to the maintenance of modular flow and as a potential barrier at the final stage of fish ascent. The central passage between the baffles quickly reaches a uniform depth of flow, but its velocity distribution continues to develop throughout the length of the weir.
Year: 2003