Wow, thanks for sharing.  That one is a poster child for Bad Regulations.

1. Let's say the berm encompasses a 4' x 4' area around the shower.  That's 16 square feet, one inch high, for a volume of 1.33 cubic feet = 10 gallons.  Under ANSI Z358, showers must put out at least 20 gallons per minute.  And that shower is likely to flow for 5, if not 15 minutes.  So the berm is essentially useless.

Now, if the reg is calling for a berm that say, stretches across an entire hallway or doorway - heck, or just around the drain itself, that might work by flooding the rest of the building, as all it does is make the floor drain non-functional.  Plugging the floor drain permanently is an easier solution.

2. The amount of hazardous material on a victim is going to be so exceedingly small and so diluted in the drains that it boggles the mind.  Seriously - you get what, 10 mL of concentrated acid on you and that washes down the drain with 100 gallons of water?   Yeesh.  And if the stuff was so nasty toxic that it is a hazard even that dilue, this city review department thinks it's better to spread the hazmat all over the building and down a couple floors onto various objects and people than it is to send it down the drain.

3. When you're blinded by something and trying to find a shower on foot or on a wheelchair, even that 1" sloped bump is a barrier.  And no doubt a trip hazard the rest of time no matter how well it's marked with floor tape.

Rob Toreki