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The rest of the area is smoother then a babies butt

The slots only account for 5% of the total area within on linear foot. So the slots will make a slight impact but not alot.

Concrete is 0.013, so how can PVC be higher than that. And the pipes are 8-10 inches.

All of the Baby Boomers went into the IT fields. Also, with the introduction of birth control the population has taken a hit. Hence reducing the overall population.

Any Ideas? I can not find any sources.

The Dam is 1000 feet long, so if you look at it as a giant weir with a coefficient of 2.8. Q=CLH^(1.5) 1'=2800 cfs 4'=22,400 cfs

The other Breach paramters that I have used are; The top width of the breah is twice that of the height, the side slopes of the breach are 1 to 1, and the total time to reach full breach is 30 minutes.

I have used a 30 minute breach scenario, The top width is twice the height of the breach and the side slopes of the breach are 1 to 1. FYI

The dam overtops by almost 4 feet from the design storm. If I breach the dam before the peak water surface elevation, then it would probably make a big difference. There would not be as much storage if I breach the dam prior to the peak water surface elevation.

When simulating a dam breach for the design storm, are you supposed to breach it at the highest water surface elevation, or should you take into account the erodibility of the soil and calculate velocities over the dam to determine when the dam will breach?