Which of the following is NOT included in the definition of stormwater?

The definition of stormwater typically encompasses water that originates from precipitation events, including rain and snow melt, and that flows over the surface of the land. This includes stormwater surface runoff, which refers to the water that flows over impervious surfaces, and snow melt drainage, which occurs when snow accumulates and then melts, contributing to the water flow.

Infiltration from urban areas also falls within the broader definition of stormwater, as it pertains to the water that seeps into the ground from urban surfaces and affects the overall hydrology.

Runoff from agricultural land, on the other hand, is generally categorized separately from the standard definition of stormwater. While agricultural runoff can contribute to watershed hydrology and may carry pollutants, it is not considered stormwater in the traditional sense, which specifically pertains to urban and developed areas. This distinction is important for regulatory purposes, as stormwater management practices are typically focused on urban runoff rather than agricultural practices. Understanding these definitions helps clarify the broader context of water management strategies in different environments.