Environmental (Blue): 

Follow the flow of fresh water from the natural reservoirs (Capilano, Symour and Coquitlam reservoir) into residential homes, and how it is used up and returned back into the environment. Notice that a percentage of water that leaves the reservoir is not returned. Climate change is an added impact into the system once air pollution created by an increasing population rises beyond a threshold. Warming of the Earth reduces snowfall returns, thus further reducing snow melt back into natural water reservoirs. 

Social (Yellow): Increasing population acts as the main trigger for decreasing natural water reservoirs as this increases total water usage of the city. The population growth is capped with an increase of 30%.

Economic (Green): The amount of money spent on the water system is depicted here with inflow being money collected from each household (flat rate of $1500 per year) and the outflow being the money spent on installation of water meters and water treatment.