Hurricane lessons: Hugo and Marilyn
The spring on the North side of STT is a spring not "rain run-off". Several area homeowners are hooked up to it by hose so that if we go through a really dry spell the cisterns can be replenished from the spring.
There are a couple of springs and people with wells hre on Northside/STT, actually.
We used to have some rivers here in STT (and STJ - not large ones but ones that always had running water but they put roads across them and deforested huge areas for residential homes. Now they are ghuts and only fill/flood during rains, taking accumulated wastes and toxins in the run-off waters into our oceans. Note that many beaches tested for bacteria are found unsafe to swim after heavy rains. That's from septic tank runoff, pesticides and animal waste.