Eastern Geographic Science Center

Dr. Dianna Hogan
Research Physical Scientist

Photos showing  installation of underground BMP and various parts. Last photo is of a rainbarrel Examples of stormwater Best Management
Practices commonly used in urban areas to
mitigate stormwater runoff:(A-top center) sand
filter in series with a detention (dry) pond, (B)
underground detention units (shown during
installation), (C) underground detention units
from photo above, buried, (D) oil and grit
separator, (E) underground storm filter, and
(F) rain barrel.

Photo of of both a sand filter and detention pond.
What are Stormwater Best Management Practices?

Stormwater Best Management Practices (BMP) refer to a number of land management structures and actions designed to mitigate the effects of urban land use. Mitigation is achieved by retaining stormwater runoff and removing pollutants in the runoff before stormwater enters local streams and down stream areas such as the Chesapeake Bay. BMP structures can be placed in the stream or on the landscape both above and below ground, and even may be used in ‘treatment trains’ where the outflow from one structure will feed into another for further processing.

The table below shows some commonly used BMP structures.             Table showing quality (Bioretention cells, sand filters, storm filters, and oil/grease separators) and quantity (Retention ponds and underground storage tanks) types of BMP.

In addition to the structural BMP there are a number of non-structural BMP that are also important in mitigating the effects of urban landscapes, including land use practices such as preservation of riparian zones, public education, and street sweeping. All of these structures and actions, when used together, may help to reduce the negative impacts of urban landscapes on local (for example, small streams) and regional (for example, Chesapeake Bay) aquatic systems.

bullet  What are Stormwater Best Management Practices?

Photos of mature BMP.
    Examples of stormwater Best Management Practices, continued: (G) stormwater wetland,(H) retention (wet) pond, (I) bioretention cell, and (J) rain garden.

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