What is an example of an emergency that would cut off the water supply to the west side of town, and how would a well on that side of town support the community in that emergency?

Any situation that disrupts the ability to deliver water or meet the needs of the community would be considered an emergency. The residents in the immediate vicinity of Oak Hill will benefit from the supply and pressure from the well, but ultimately, the well can be used by the entire community of Petaluma.