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RENTALS & SALES
POROUS ASPHALT PAVEMENT
UNIFORMLY GRADED STONE
AGGREGATE WITH 40% VOID
SPACE FOR STORMWATER
STORAGE AND RECHARGE
swirl separator, a cylinder that creates an eddy that forces water through a separa-
tion screen that catches sediment and pollutants. The water is then returned to the
swales, where any overflow goes immediately into the stormwater main pipe. Water
in the swales passes over a series of
weirs that keep the flow even and on a
slight decline through the plantings. At
the end of each swale, water flows into
the stormwater main pipe.
According to Brandon Morgan, Senior
Development Manager at Vulcan Real
Estate, the swale project may be the
largest of its type in an urban area.
When completed, the annual capacity
will be 190 million gallons, equivalent
to the top 3 feet of water in Lake
Union. Thus far the capacity of the
swales has exceeded expectations and
the utility plans to increase the stormwater flow to them.
A variety of stormwater strategies
was used at the Education Innovation
Instruction Facility at the University of
Hawaii’s Leeward Community College.
Sustainability consultant Paladino
and Company led an eco-charrette to
develop comprehensive building and
landscape solutions. Campus landscap-
ing includes bioretention, smart irriga-
tion, a green roof, rain gardens and rainwater harvesting for irrigation. All runoff water
is treated and filtered on site through bioswales and irrigation. Building gutters direct
rain water to infiltrating rock beds and biorentia or to bioswales. During peak rainfall
periods, stormwater enters a campus cistern. B
POROUS PAVEMENTS use a special mix of asphalt or concrete that allows stormwater to
flow through pores to the ground.
RAIN GARDENS ARE FLEXIBLE solutions
for retrofits of existing properties. They
can be used on edges of buildings and
parking lots, road medians and parking