BMP Monitoring Sites - Urban Drainage and Flood Control District

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UDFCD BMP MONITORING SITES Permeable Interlocking Concrete Pavement under Geotextile Fabric above. Products that meet these requirements are: o US Fabric US 2070 and US 670 o Mirafi Filterweave 500 and 700 o Carthage Mills Carthage 6%. Fabric/Liner Installation Place by rolling fabric parallel to the contours starting at the most downstream part of the pavement. Provide a minimum of 18” 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. Perimeter Wall Recommend that a concrete perimeter wall be installed to confine the edges of the PICP block areas. Contained Cells 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 PICP installation. Distance (Lmax) between these cut-off barriers shall not exceed: L max = 1. 5∗ D So o Lmax = maximum distance between cut-off membrane normal to the flow (ft) o So = slope of the base course (ft/ft) o D = depth of gravel base course (ft) Subdrain System When the PICP is located on NRCS Type D soils, when the Type B or C soil sub-base is to be compacted for structural reasons, or when an impermeable membrane liner is needed, install a subdrain
UDFCD BMP MONITORING SITES Permeable Interlocking Concrete Pavement system using perforated HDPE pipe. Locate each perforated pipe just upstream of the lateral-flow cut-off barrier. Do not exceed 20-foot spacing. Use a control orifice sized to drain the pore volume of empty each cell in 6 hours or more. Design Area Ratio The design area ratio shall not exceed 2.0 (ratio = And Effective contributing impervious area/pervious pavement area). Imperviousness The interim recommendations for the Effective Imperviousness are provided in the Manual.
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BMP Monitoring Sites - Urban Drainage and Flood Control District

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