Impact assessment of the Blackadder Creek Weir on fish movements: Winter – Spring 2015. Report to City of Swan

Ryan, T., Keleher, J. and Beatty, S. (2016) Impact assessment of the Blackadder Creek Weir on fish movements: Winter – Spring 2015. Report to City of Swan. Freshwater Fish Group & Fish Health Unit, Centre for Fish & Fisheries Research, Murdoch University

Abstract

The Blackadder Weir is located approximately 300 m upstream of the confluence with the Swan River. In was constructed as a rock wall in 2010 and rebuilt in 2010 as a concrete causeway with a round 400 mm culvert to allow to flow of water downstream. During periods of high rainfall events and/or higher river levels and tidal inflows from the Swan River, Blackadder Weir can drown out. High rainfall events and catchment runoff occurred in winter and early spring 2014 and 2015, demonstrating the seasonal pattern of potential weir drown‐out. However, for the majority of the time, including most of spring, summer and autumn, Blackadder Weir represents a potential fish passage barrier.

The current report details the results of intensive fish monitoring conducted above and below the Blackadder Weir during winter and spring 2015. It summarises the overall impacts of Blackadder Weir to fish movements ascertained from both the current and previous (spring/summer 2014) fish surveys. It then identifies options for the design, construction and operation of an appropriate fishway and associated fish monitoring program.

Publication Type:	Report
Murdoch Affiliation:	Centre for Fish and Fisheries Research Freshwater Fish Group & Fish Health Unit
Publisher:	Freshwater Fish Group & Fish Health Unit, Centre for Fish & Fisheries Research, Murdoch University
URI:	http://researchrepository.murdoch.edu.au/id/eprint/36488

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