NSWâs vision for the future dependent on flood modelling Save Normal text size Advertisement Billions of dollars of development in Sydneyâs west and north-west are dependent on flood-proofing the region, with growing opposition to raising the Warragamba Dam wall casting doubt on ambitions to double the population and generate thousands of new jobs in the area. Planning Minister Rob Stokes said on Tuesday the NSW governmentâs vision for the future of the Hawkesbury-Nepean region depended on flood modelling being undertaken in the area while the state embarks on a controversial plan to raise the wall of Sydneyâs biggest reservoir by as much as 17 metres.