We simulated combined sewer overflow constructed wetlands (CSO CWs) in HYDRUS/CW2D.
Previous research showed strong limitations simulating CSO CWs in HYDRUS/CW2D.
We calibrated biokinetic and other parameters using laboratory column experiments.
We report quazi-stable biomass and a good fit for single loads and a load series.
Former limitations were overcome and validation can continue with full scale.