In the winter, thermal shock from warmed surfaces causes a temperature gradient of several degrees Celsius between the drain water and that of Laurel Creek and a decrease in dissolved oxygen. This is exacerbated by the absence of shade in winter that is provided by deciduous trees in the summer. Although testing revealed the absolute levels of a few contaminants on a few specific dates, the researchers could only make assumptions as to the overall significance of contamination from the MC drain on Laurel Creek. This was based on rather crude calculations of the dilution factor. Therefore, it is strongly recommended that further research should be done to determine the cumulative impacts of the many storm drains which empty into the campus portion of Laurel Creek.
Specific parameters tested in the MC drain also require further study.
In particular, the abnormal levels of chloride, conductivity, and faecal and total coliforms found in the drain should prompt further study. This study identified possible land uses and human activities that likely impact water quality in the drain and in the Creek. However, no sources could be pinpointed with absolute certainty. The identification of specific sources and locations of contamination would be helpful for remedial action. It may be useful to determine how people perceive the function of the drain.