Critical Source Areas

In recent years, researchers have developed various new tools to help identify the major sources of phosphorus on our watershed landscape, which contribute disproportionately to the blue-green algae blooms that plague the bay each summer. Among these tools are critical source area maps, which combine information such as LIDAR elevation and slope data, soil P values, and hydrology data to identify areas of high nutrient and sediment loss, on the landscape level down to the sub-field level. This identification of critical source areas (CSA’s) can help us to target Best Management Practices on agricultural land, stormwater treatment practices on developed land and roads, as well as riparian buffers to combat stream bank erosion.

Identification of Critical Source Areas of Phosphorus within the Vermont Sector of the Missisquoi Bay Basin

Missisquoi Watershed CSA


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