I m working on a dormitory for kids. On the project we have bathrooms that only will be used by the kids (I am considering them as residencial), and other restrooms that will only be used for the visits (I am considering them as public). On the bathrooms for kids there will be some urinals.

If I use Water Use reduction calculator and I classify the bathrooms for kids as residencial, the uses per day of the urinal is 0. Do you know if I can change this?