River weirs: design, maintenance, modification and removal
6 December 2016
This event launched new CIRIA guidance, River Weirs: Design, maintenance, modification and removal.
good practice guide replaces guidance by Rickard et al (2003). Although
comprehensive, lessons have been learned in terms of operational safety
since publication, and the implementation of the Water Framework
Directive (WFD) 2000 has led to a greater focus on weir removal.
Although the majority of work on weirs is still carried out to maintain
the current function(s) of weirs, this guide leans heavily towards the
alteration of weirs to benefit ecology, reflecting an industry need for
greater guidance on topics such as geomorphology, environmental issues,
alternatives to weirs and weir removal. Throughout the guide, the reader
is encouraged to ask whether a weir is the best option and to consider
weir removal as a preferable design option, should assessments show this
to be feasible.