What is the site-based load limit for total phosphorous in terms of annual rate?

The site-based load limit for total phosphorus set at an annual rate of 0.41 lbs/acre/yr aligns with Virginia's stormwater management regulations. This standard is often established to address nutrient management in water bodies, particularly in relation to water quality and the prevention of eutrophication. The limit is designed to reduce phosphorus runoff from developed sites, as excess phosphorus can lead to harmful algal blooms and deteriorate aquatic ecosystems.

Understanding this figure is crucial for SWM inspectors as it informs how much phosphorus can be tolerated from each acre of land under different land use configurations. It reflects the need for careful management practices to mitigate environmental impacts. This limit is rooted in scientific research regarding the acceptable levels of phosphorus in various settings, ensuring that development does not compromise water quality in nearby streams and lakes.

In this context, the other options do not align with the regulatory framework established by the DEQ, either because they are set too low or too high, which could present a risk to aquatic health and contradict the environmental protection goals of stormwater management.