Storage facility negligence led to the loss of everything we own - what are my options/rights?

My wife and I moved from OH to TX in May'09. Last weekend we went to our Public Storage unit to move everything into our new apartment. We opened the unit to find water damage due to flooding of the lot on everything. There were piles of maggots, ants and cockroaches - heavy mold on many of our belongings. We have insurance on the unit but they won't cover flood damage. Yesterday it rained all morning so we went to check out the lot after work. There was standing water at the lip of the garage door - and that was after a relatively small amount of rain. I receive emails from them all the time about "money saving specials" and customer surveys - they should have sent one that mentioned the standing water in the lot. If we had got there earlier we could have dryed everything out. What can we