Steven C. Chapra, Ph.D., F.ASCE; Kyle F. Flynn, Aff.M.ASCE; and J. Christopher Rutherford are the recipients of the Wesley W. Horner Award for the paper “Parsimonious Model for Assessing Nutrient Impacts on Periphyton-Dominated Streams,” published in the June 2014 issue of ASCE’s Journal of Environmental Engineering.
The Wesley W. Horner Award recognizes papers that have contributed to the areas of hydrology, urban drainage, or sewerage.
In this nominated work, researchers illustrate how parsimonious process–based models can be used to assess the impact of nutrients on shallow periphyton-dominated streams. After a brief overview of previous research, a simple model is developed to predict periphyton levels below a point nutrient loading to a uniform geometry, steady-state stream. The model is then used to address 2 eutrophication management questions. First, it is shown how simple models can be employed for nutrient loading calculations, that is, to determine the nutrient loadings necessary to maintain periphyton below nuisance levels downstream of a point source. Then, it is shown how the model can be used to establish nutrient criteria to directly calculate the required in-stream nutrient concentrations to achieve the same objective.