Data Source:MN Pollution Control Agency, Natural Resources Research Institute
Tags:nutrients, rivers, streams, Water Quality
WQ – Streams – FWMC – Phosphorus
Extent of available data.
This data layer indicates the Flow Weighted Mean Concentration (FWMC) of phosphorus of streams in watersheds throughout the state. It was developed at NRRI using data from the MN Pollution Control Agency’s Watershed Pollutant Load Monitoring Network (WPLMN). The WPLMN program began in 2007 and uses water quality and flow data to calculate nutrient and sediment loads and concentrations from 199 major and sub-watersheds across the state. FWMC are calculated by dividing the total load over the estimation time period by the total streamflow. These data can be used for watershed modeling, determining pollutant source contributions, tracking water quality trends, and assessing water quality restoration efforts. Phosphorus often limits the growth of algae and plants in lakes and streams. Elevated levels of phosphorus can lead to undesirable levels of algal and aquatic plant growth.