|
||||||||||||
|
|
||||||||||||
| Description | ||||||||||||
|
The stormwater
management improvements at
Wayne Art Center include three rain gardens and a pervious asphalt
parking lot with a subsurface storage and infiltration system. The aging stormwater
management system constructed in the early 1990s at Wayne Art Center
(WAC) had been insufficient at dealing with runoff. The system's substrate was not
effectively draining and overflow mechanisms were not operating according to
design. The system was leaking onto the pavement, and 4 or 5 feet of
stagnant water always filled the reservoir. New stormwater Best
Management Practices (BMPs) were built in conjunction with the conversion of an old Masonic hall
into a new art studio along with an expansion of the original WAC
building. Instead of demolishing
the old stormwater management system and reconstructing a new one, the
system was left in place and an investigation of the system took place
following the implementation of the new system installation. 3,423 cubic feet of stormwater storage can be accounted for with the new construction of the recharge bed, and 4,294 cubic feet of water can be infiltrated through the recharge bed’s substrate (calculated conservatively at 1 inch per hour), which equals a total capacity of 7,717 cubic feet. The rain gardens, not included in this calculation for volume capacity, will further reduce flooding during storm events. With these site improvements, the runoff generated by the 2-year storm should be completely captured by the stormwater management system. According to estimates, peak rates for the 2-year storm should be reduced by 73%, while the 100-year storm should have a reduced peak rate of 9%.
Rain water is collected
and infiltrated by rain gardens that are filled with native plant
species. For a plant list, please click
here. For a detail
of a typical rain garden click
here. The drainage area for
the system includes the new parking lot, sections of the new WAC
extension, half of the converted Masonic hall and the new sidewalks at
the front of the building. Roof leaders from the Masonic hall and from
the new WAC expansion drain into the rain gardens. Another seepage bed
was added at the outlets of the overflow pipes leading from two of the
rain gardens. An HDPE riser pipe
takes overflow from one of the three rain gardens during a storm event,
where it can overflow into the infiltration bed, which is filled with 3
feet of uniformly-graded clean-washed aggregate located beneath the
porous pavement parking lot. 40% of the infiltration bed is void space
and is able to indefinitely store 1.5 feet of water, or 3,423 cubic feet
of stormwater. The infiltration bed itself overflows into a
pre-existing pipe 15 inches in diameter that flows below Maplewood
Avenue. A new overflow pipe was installed within the existing system to
help drain it as well. |
||||||||||||
|
||||||||||||
| Location | ||||||||||||
|
County:
Delaware
Wayne Art Center is located at the intersection of Maplewood Avenue and
Conestoga Road in Wayne, Pennsylvania. Ithan Creek is the most affected
body of water in the vicinity of Wayne Art Center. |
||||||||||||
| Partners | ||||||||||||
|
Wayne
Art Center |
||||||||||||
| Cost | ||||||||||||
|
PA DEP Growing Greener
grant (2002): $63,367 |
||||||||||||
| Contact | ||||||||||||
|
Courtney E. Marm |
||||||||||||
|
||||||||||||
