Thanks- I thought as much but thought I would ask anyway. We use Bill's- dat to dat converter, but your're right, it doesn't quite do this.
We're using depth grids from a Tu Flow model, so ideally we would able to find out the time that a certain area is actually flooded during a event. This could help with emergency planning response times. The second stage would be to identify the time of the greatest increase in depth per area- ie one of the elements that help use to identify hazard to an area.