Here is something I had not considered before

[NorthernRaider]

Any house on a slope or at the bottom of a slope is at some risk after TSHTF becuase mother nature will make great efforts each year to stuff up the dains, gullies and gutters with fallen leaves eaxh autumn and fresh root growth each spring, then instead of the rainfall following mans neat artificial water courses it will start to find its own.

But can you imagine the millions of houses, factories and shops that will go unheated in winter after TSHTF and how many burst pipes there will be?