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BMPs can be categorized as Non-Structural or Structural. In most
cases, an effective mix of Structural and Non-Structural BMPs is
needed to meet the set objectives.
- Non-structural BMPs are “soft”
techniques, such as establishing policies and regulations, advocating
responsible use of pesticides and fertilizers, and providing information
and education. Non-Structural BMPs tend to be less expensive than
Structural BMPs; however, there is less assurance of effectiveness
because their performance depends on effective delivery of information
and compliance with the recommendations given.
- Structural BMPs are designed facilities
or modified natural environments that provide predictable improvements
in urban stormwater quality and quantity.
BMPs can also be categorized according to where they intervene
in stormwater flow:
- On-Site BMPs manage the pollutant
content and volume of stormwater as close as possible to their
origin.
- Conveyance BMPs reduce pollutants
while the runoff is being conveyed to the receiving water body.
These are primarily structural BMPs.
- End-of-Pipe BMPs treat stormwater
from a significant fraction of the catchment area. These are primarily
structural BMPs.
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