Chris:

I've a couple of questions on the piping failure mode in dambrk:

1. The piping initiates at an elevation |-CDO| and is rectangular in shape. Correct?

2. If 1 above is correct, then what shall we input as BB (breach bottom width) and Z (breach side slope)? Average breach width, and zero side slope? Or the bottom width of an equivalent trapezoid and its side slope?

3. How does it grow? When does the top sink in?

I would greatly appreciate your response to the above questions.

Regards,

Sanjay