[sshand]

I have noticed, while analysising a "Sunny Day Failure" (ie piping failure), in the flood crest summary output, that for the last few cross section locations that the flood wave arrival time is decreasing.

For example:

At 5.5km Flood wave arrival time is 1.80 hrs
At 5.9km Flood wave arrival time is 1.94 hrs
At 6.0km Flood wave arrival time is 0.57 hrs.

My time to breach is 0.36 hrs.

Assuming my input is correct, why would this be occuring. It does not seem to occur for a flood induced failure (ie overtopping).

Scott Shand