The other input represents the weights assigned by the stakeholder. The result is an environmental cost
of the management policy that has produced the regulated flows.
By using BBN, a tool that permits to assign a cost to a pre - determined management policy was
developed. It addresses the issue of fish habitat preservation through the concept of an environmental
index instead of minimum instream flow. Its main advantage is that it allows stakeholders to assign their
owns weights in a simple way and to evaluate the environmental performance of a water management