The P8 watershed water quality model was used to model performance of stormwater best management practices (BMPs) in the Lake Como watershed. Lake Como has a draft TMDL that will require 60% retention of the phosphorus that is currently discharging into the lake. The model indicates that current stormwater BMPs are retaining 32% of phosphorus discharge, if properly maintained. This will fall to 21% if sufficient maintenance is not performed. The ponds in the Lake Como watershed do not have as much of a decrease in performance if maintenance is not performed, but also do not remove as high a percent of the incoming phosphorus. To achieve the draft TMDL goals, approximately 20.5 acre-ft of infiltration practices or enhanced sand filters will need to be strategically placed in the watershed.
US Environmental Protection Section 319 Program; Minnesota Pollution Control Agency
Weiss, Peter T.; Gulliver, John S.; Erickson, Andrew J..
Total Daily Maximum Daily Load Demonstration Study.
St. Anthony Falls Laboratory.
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