STORM WATER
MANAGEMENT SITE PLAN
What is a
SWMSP?
SWMSP stands for
a Storm Water management Site Plan.
A SWMSP must be prepared for a development of 12,000 square
feet or larger. A site plan will be accepted in lieu if the
site plan shows development will create less than 5,000 square feet
of impervious surface.
The SWMSP is
designed by the developer’s engineer in coordination with the
drainage plan and shall include permanent drainage and landscaping
features that will minimize or mitigate the development’s
long-term effect on the quality and quantity of storm water runoff
from the site.
Why has the
City of
Arlington
implemented this new plan?
The City’s Municipal Separate Storm Sewer System (MS4) permit
requires the implementation of permanent controls to minimize the
discharge of pollutants from development after construction is
completed. These
controls are called Best Management Practices or BMPs.
Preconstruction
features such as vegetation, swales and natural depressions help
decrease the amount of runoff downstream. Natural features like
these absorb and filter runoff and help retain rainwater. Removal of
these features during development not only increases the runoff from
rain but can also adversely affect water quality by increasing the
downstream erosion.
With site
development, the natural drainage system is replaced with pavement,
curbs, pipes, concrete channels and similar structures, resulting in
more water moving faster. Pollutants, such as litter
and automobile fluids, are also moved with the water to the natural
creeks. Permanent BMPs are designed to reduce the amount of runoff
and pollutants from developed sites and to improve overall water
quality in natural creeks.
Documents
Download the
information found above in PDF format to read and print at
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