Glossary of Terms

A Note on Terminology

At the beginning of this project, “low impact development” (LID), was not a familiar term to most people, although the term “best management practice” (BMP) was fairly common. LID embodies an approach of developing a site, whereas BMP refers to those individual practices that may be components of LID site design. Therefore, on this website, the model subdivision will be referred to as the “LID subdivision”, but when discussing the individual practices used, the term BMP will be used.

Best Management Practice. A device, practice, or method for removing, reducing, retarding, or preventing targeted stormwater runoff constituents, pollutants and contaminants from reaching receiving waters. (US EPA, 2002. Urban Stormwater BMP Performance monitoring: A Guidance Manual for Meeting the National Stormwater BMP Database Requirements).

Low Impact Development
A new comprehensive land planning and engineering design approach with a goal of maintaining and enhancing the pre-development hydrologic regime of urban and developing watersheds. (LID center,

Graph and Table Terminology for the Results Section
5-day biochemical oxygen demand
Mass Export The mass of a pollutant leaving a site, per unit area. This is calculated by multiplying a concentration (e.g., mg/L), by volume (e.g., cubic meters), to obtain a mass per unit area, per unit time (e.g., kilogram/hectare/year).
Ammonia nitrogen
Nitrite + nitrate nitrogen
Return Period
A return period also known as a recurrence interval is an estimate of the likelihood of a flood or river discharge flow of a certain size. It is a statistical measurement denoting the average recurrence interval over an extended period of time.
Total nitrogen
Total phosphorus
Total suspended solids

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