Audubon Hollow is a new, 3-acre
community of 22 homes surrounding a football field-sized park described as an
“urban forest.” Audubon Hollow’s winding driveway crosses a natural ravine,
part of the regional flood control network, via a 32-foot-long arched metal
bridge. Engineers designed a complex retaining wall system of mechanically
stabilized earth (MSE) to raise the land out of the floodplain and establish
flat home sites.
Brown and Gay Engineers designed
an underground detention system to mitigate the effects of stormwater runoff
into the ravine. High runoff rates associated with urban development can have
negative impacts on waterways and erode natural channels.
With the high cost of land in
this part of Houston, they placed the system below grade to maximize available
site area. The system is buried under the
street and central park, holding the stormwater and slowly releasing it into
A total of 469 linear feet of
144" perforated Corrugated Metal Pipe (CMP) from Contech Engineered Solutions was used to build the detention
system. The large diameter pipe maximized the storage in a small footprint and minimized
Perforated CMP was chosen to take
advantage of the void space in the porous stone around the pipes to store a
portion of the detention volume. Maintenance access was provided by a custom 36” CMP riser that has prefabricated stubs to connect to the sites’ drainage
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In the State of North Carolina, engineering services are provided by Contech Arch Engineering, Professional Corporation.