Journal of Student Research 2018

Urban Photsphorus Runoff and Loading to Half Moon Lake, Wisconsin Storm sewer two drain was originally constructed in 1952. Construction of the Mayo Clinic expansion, newer storm drains, and BMPs occurred in ~ 2008. The intention of the BMPs were to trap sediment and enhance infiltration (J. R. Genskow, PE. City of Eau Claire Engineering Department, Eau Claire, WI, personal communication). The subwatershed draining into storm sewer 2 included several parking lots on the Luther Hospital campus (Fig. 3)

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Figure 3. The subwatershed draining into storm sewer 2.

Expansion and upgrade of the campus occurred between 2008 and 2010 and included repavement of these parking lots with the addition of rock island infiltration zones and grassy infiltration areas to reduce runoff from these impervious areas (Fig. 2). This research examined flow, P concentrations and P loading from storm sewer two during 2017 for comparison with a long term data base to evaluate the potential impacts of BMPs on urban loading to the lake Methods Storm water sampling theory and strategies Choosing an efficient sampling strategy can result in more useable data and save researchers time and money. An efficient sampling strategy