To achieve water balance, we must design systems that are interconnected with and  perform like ecosystems to achieve water balance in the built environment. 

Nature has adapted perfectly to the extremely varied distribution of water across the planet through a diversity of ecosystems that thrive in all climates. the one commonality is the presence of water -- a prerequisite for life. The issue is not the global quantity of fresh water, but its poor distribution and how we continue to pollute it.