RWQM1 in WEST 2016

Is RWQM1 available in WEST 2016?

I tried to find an implementation of RWQM1 but to my surprise the IUWS model library contains a simplified river model. Am I overlooking something?

Most likely not (= overlooking).
Have you looked into 2017? there are 2 Instances (IUWS1 and IUWS2) respectively using a 'RM1' and 'RM2' - I assume one of the two is the one you're looking for.