In general, all flume types can be used on sanitary flows.  Typically the determining factor is throat width and not flume style - although not all flumes styles are regularly used on sanitary flows.

Designed from the outset to measure santiary flows, all sizes of Palmer-Bowlus flume are suitable for measuring those flows.

For Parshall, Montana, and Cutthroat flumes the minimum size / throat width that should be used on sanitary flows is 3-inches [7.62 cm].  Smaller than that and it is almost certain that the flume will clog.  

Smaller HS flumes should likewise not be used on flows with large sanitary solids due to the likelihood of solids clogging in the V-shaped discharge at the exit of the flume.  

Due to their relatively small range of sizes, lack of inlet / outlet transitions or end adapters, and raised throat ramp, RBC flumes are rarely - if ever - used on sanitary flows.  Trapezoidal flumes are typically a better fit for sanitary applications where RBC flumes may initially be considered