This year marks the 100th anniversary of the famous Streeter and Phelps water quality model. Unfortunately, despite incredible progress in the biological sciences, the biology in our operational water quality models has not changed much since then. In a vision paper, which just came out in ES&T (see link below), I critique the state of biology in our water quality models, and argue for updating it. I am happy that ES&T agreed to publish this paper and hope it will lead to some discussion about this important topic.
Link to paper: http://pubs.acs.org/doi/full/10.1021/acs.est.5b02130