Wow Steve, excellent information. I already have a significant amount of that setup so this could be a feasible project for me. Problem is I don't trust the dog (Jack Russell)...
Only thing I could think to add would be a phone alert monitor for flooding. Only model I could find online with a quick search was one that did freeze alert too (which would be nice also).
http://waterdetectoralarms.com/catalog/i4.html
Thanks!
-jim