Can we make urban water systems more sustainable?

In Canada, urban environments are home to the vast majority of us. But as population densities continue to intensify, so does the pressure on urban infrastructure. How can we best manage our water infrastructure to provide sustainable, environmentally holistic solutions?
Figure 1 Urban Metabolism

Figure 1 Urban Metabolism

Figure 2 Linear Water Metabolism Approach

Figure 2 Linear Water Metabolism Approach

Figure 3 Circular Water Metabolism Approach

Figure 3 Circular Water Metabolism Approach