Environmental Engineering Reference
In-Depth Information
Figure B-47
Different porous pavements were constructed side by side.
designed and installed for both the new and existing pavements, including flow
measurements to evaluate water balance and any overflow discharge. In addition,
the county installed several subsurface water quality stormwater treatment units
downgradient from this area, and again their performance was monitored. All
three pavement types were successful in allowing infiltration of rainfall, and the
major differential consisted of the cost and maintenance requirements. The results
helped to inform the county and other regional governments as to the effective-
ness of porous pavements in southern California. In a subsequent demonstration
phase, roof runoff was monitored and discharged to the subsurface beds built to
serve adjacent buildings.
San Diego County Park, Flynn Springs, El Cajon, CA (2006)
In 2006, Cahill Associates was retained by the San Diego County Department
of Parks to retrofit existing parking areas at the Flynn Springs site, as a demon-
stration of the technology of porous pavement for groundwater recharge and
runoff mitigation. In a very arid region where annual rainfall is less than 10 in.
a year, the importance of aquifer recharge cannot be overestimated. The county
received a grant from the California Water Resources Control Board to complete
the retrofit, which not only included the design and installation of the porous
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