My friends' house was flooded in 2000 (along with half the town). The water never got above the ground floor, but it was nearly up to the ceiling.
Their contents was claim was over £23k, even that long ago. They had managed to get the valuable books and an expensive camera upstairs, and all her jewellery was in the bedroom, so there was nothing particularly valuable, just mid-range furniture, carpets, electricals, white goods etc. Reference books and CDs came to a remarkable amount.
The thing that astonished them was the cost of replacing the kitchen stuff. All those bits and pieces that they'd acquired over the years added up to far more than they imagined. And their insurance was new-for-old, so her 20+ year old top of the range Kenwood Chef was replaced with a new, top of the range, Kenwood Chef. We spent a couple of evenings going through an Argos catalogue with them going "We had one of those ... we had one of those ... we had one of those".
They had a ground floor bathroom and were surprised at the value of the contents of that. All her make up, perfume and skin care stuff was in there, as well as towels, electric razors etc.
So many people were flooded out that autumn that getting rented accommodation anywhere in the area was damn near impossible. They lived in a static caravan in their front garden for 7 months, which was hell. The winter was bitterly cold and the sewage pipe and Calor gas both froze.
We revised the level of our contents insurance upwards at the next renewal, we were massively underinsured.