BMP Monitoring Sites - Urban Drainage and Flood Control District

UDFCD BMP MONITORING SITES
Pervious Concrete Pavement
Place by rolling fabric parallel to the contours starting at
the most downstream part of the pavement. Provide a
minimum of 18” of overlap between adjacent sheets.
Bring up geotextile and impermeable
membrane to the top of perimeter
walls. Attach membrane and fabric to
perimeter walls with roofing tar or other
adhesive or concrete anchors. Provide
sufficient slack in the geotextile and
membranes to prevent stretching them
when sand and/or rock is placed. Seal
all joints of impermeable membrane to be totally leak
free.
Impermeable Liner
Contained Cells
When expansive or NRCS Type D soils are present, or
potential for groundwater contamination exists, install a
16 mil thick impermeable liner on the bottom
and sides of the basin under the pavement. If soils are
not expansive (i.e. NRCS Type A, B or C), use a woven
geotextile material that meets the requirements specified
under Geotextile Fabric above. Products that meet these
requirements are:
◊ US Fabric US 2070 and US 670
◊ Mirafi Filterweave 500 and 700
◊ Carthage Mills Carthage 6%.
Install lateral flow cut-off barriers using 16 mil or
thicker PE or PVC membrane
liner or concrete walls installed
parallel to the contours (i.e.
normal to the flow) to prevent flow
of water downstream and then
surfacing at the toe of the
pervious concrete pavement
installation. Distance (Lmax)
between these cut-off barriers
shall not exceed:
D
L max = 1. 5∗ So