Novel methods for managing freshwater refuges against climate change in southern Australia. Supporting Document 4: Evaluating small barrier removal to improve refuge connectivity – A global review of barrier decommissioning and a process for southern Australia in a drying climate
Authors: Stephen Beatty, Mark Allen, Alan Lymbery, Tim Storer, Gillian White, David Morgan and Tom Ryan
Provides useful information to managers of fluvial ecosystems regarding the impacts of instream barriers such as dams and weirs in the context of river regulation. Specifically, the report is a review of the global literature on the impacts of these barriers, and the processes that exist for prioritising their removal in an attempt to improve refuge connectivity. As a result, a stepwise protocol for barrier identification and prioritisation was developed and trialled in three catchments in south-western Australia. The approach undertaken combined landholder surveys, GIS database analysis, and rapid aerial assessments. A score and ranking system that weights both the positive and potential negative impacts of removing instream barriers was also developed.