Phosphorus ("P") is a naturally occurring element and a major nutrient required for biological productivity. It is found in all living plants and animals, including people.
Human impact on the environment can cause increased levels of P from several sources including runoff and fertilizer use. Development and land use change, including the creation of impervious cover (parking lots and roads) can limit natural ground filtration and cause an increase of P in freshwater.
The Lake Winnipesaukee Watershed Management plan has identified limiting the P load as a key goal for overall lake health.
So, how can you help? Use the NEW HAMPSHIRE RESIDENTIAL LOADING MODEL tool to determine your P load on the Lake.
This tool will allow users to calculate their current Phosphorus runoff, and determine the impact of changes such as new construction, land use changes, or implementation of new stormwater treatment practices.
This tool will guide you through the following steps:
- Enter Your Site Conditions, including location, land use (current and planned) and annual fertilizer use
- Input Current Stormwater Treatment Practices used, such as Rain Barrels, Dry Wells, Filtration, etc.
- Input any Planned Stormwater Treatment Practices, for comparison
- Review the results, and determine whether any planned changes will reach P reduction goals
For more information on Phosphorus, please click here (PDF 1.1mb)