Ditchmen • NUCA of Florida Ditchmen • April 2017 | Page 28

system. The Board brought
in DMK and Axis Engineering,
PLC (Venice, Fla.) to further
develop the West Dearborn
Street Low Impact Design
Pilot Project.
The design team’s strategy
was to “surround and capture”
the storm water runoff with
LID practices wherever
possible. They recognized
the importance of using a
treatment train approach for
an optimal level of pollutant
reduction when runoff could
not be eliminated and had to
be discharged into Lemon
Bay. The team also prioritized
preservation of assets, re-use
of materials and minimizing
impervious areas in the
design.

The treatment train system
is designed to convey road
and roof runoff to nearby
bioswales where engineered
soil media provides a high
level of treatment. Water
then flows out of the
underdrain to a re-use/
discharge pipe. During more
intense storm events, excess
runoff flows into the re-use/
discharge section that was
constructed using 13,000 feet
of 12- to 36-inch diameter
N-12® HP pipe manufactured
by Advanced Drainage
Systems, Inc. (ADS) (NYSE:
WMS). Pipe connections into
this system were made using
74 ADS Inserta Tee® fittings in
diameters ranging from 6 to
18 inches.

The system used 109
FLEXSTORM® Inlet Filters
to trap debris. The filter is
adjustable to fit any drainage
28
DITCHMEN • APRIL 2017
structure and provide
maximum protection while
being easy to install and
economical. The filter is
available to fit all frame and
grate castings and precast
structures. It is made up of a
rigid galvanized or stainless
steel frame that supports a
variety of filter bags designed
to remove storm water
pollution.

Additionally, 135 Nyloplast®
basins in 18 to 30 inches in
diameter, which are basins
that combine ductile iron
grates with a rugged, heavy–
duty PVC structure were
used for the road-surface
structures to filter silt, solids
and other pollutants. The
inlet filters and basins are also
products of ADS.
Due to the Best Management
Practices in this system
including the design and
the products that have been
proven to help meet the
EPA’s National Pollutant
Discharge Elimination System
(NPDES) Phase II Storm Water
Rule, this is a model project
for others to also implement.

For additional information, go
to: www.ads-pipe.com.
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