Quote:
Originally Posted by Benboy  I was told they are for the drainage/passage of water from the mountains and higher land. They have to be kept there to allow for the passage of water. |
I believe thats correct, except now they put in large pipes fill over them and build on them, which works fine until rocks block the pipes, the pressure then builds, finds the weakest spot, and explodes out, taking fair chunks of whatever is above it, with it
