A methodology has been developed that can be used to analyse and categorise dam facilities in terms of their vulnerability to floating debris and provide guidance on prioritisation and choice of remedial action.
The assessments can be performed by an individual with good local knowledge and understanding of the problem of floating debris or, alternatively, with the help of various in-depth analyses, such as spatial analysis.
To prioritize the need for mitigation measures, the vulnerability of upstream and downstream facilities must be taken into account, as well as the hazard classification, the facility’s importance in relation to flood management in the river system, its discharge capacity margin, access to bottom outlets, and the rate of water level rising in the reservoir and freeboard.
The process of selecting a measure starts with a description of alternative measures, the conditions under which they work, and the effect they attain.
Measures may include emergency contingency measures, maintenance measures, or physical, more permanent, construction measures aimed at preventing the production of floating debris, the transport of floating debris, or the blockage and/or drawdown of floating debris.