Public school shower concrete trench drain

[joeplumber123]

Instead of a metal trench drain installed into concrete, can the concrete itself be a trench drain, with intermediate floor drains collecting into an underground main? Kind of like an outdoor concrete swale? And then within the concrete trench will be sloped into the floor drain so two shower stalls will have wastewater flow into one shared floor drain.
The CPC says wastewater can't spill between two showers, so the thinking is the swale/ditch/trench will prevent that.
Thanks. Any thoughts or insights on this will help!

 

[Bill Ernst]

That’s going to be difficult to argue in your favor - if two showers are sharing one trap....
Hey, how come you’re not RFI-ing to the architect/DSA?

 

[ADAguy]

Would that be black powder Bill?