BMP Monitoring Sites - Urban Drainage and Flood Control District

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UDFCD BMP MONITORING SITES Pervious Concrete Pavement Typical Details Use utility vault w/ lid to collect underdrains. Monolithically poured porous concrete. 1in 5"** D = 0.67'(8") min.** 1" (min.) C-33 Sand 6" (min.) Underdrain trench 6" (min.) trench depth 16 MIL (mon.) plastic impermeable membrane on top of subgrade when required and at bottom of underdrain trench. Woven geotextile fabric meeting: ASTM D4751-AOS US Std. Sieve #50 to #70, ASTM D4633 min. trapezoidal tear strength 100 x 60 lbs, Minimum COE specified open area of 4%. Section A-A ** For personal vehicles & pickup trucks. Thicker section may be required for heavier vehicles. Consult with pavement engineer for needed thickness of concrete slab. *** Base course: AASHTO #67, #8 or #4 aggregate with all fractured faces. So = 0% to 2% (max.) Lmax = D/(1.5*So) A Monolithically poured porous concrete (mix of AASHTO #8 or #67 gravel and portland cement per specifications in the BMP Details and Specifications Chapter of this Manual). No phosphorous based admixtures allowed in the PCP mix. 5"** D = 0.67'(8") min.** So = 1% (min.) Install 16 MIL (min.) impermeable membrane under pipe & wrap it on d/s side to within 1in(+ 2"/-0") 1 of top of gravel to serve as horizontal flow barrier. A When certified tests show percolation rates of less than 60 minutes per inch of drawdawn under the PP bottom and infiltration is allowed, eliminate the bottom sand layer and underdrains. When Type C soils are present and when infiltration is allowed, unless percolations show otherwise, eliminate the bottom sand layer, use underdrains and geotextile liner instead of an impermeable one under the gravel. When the underlying soils are NRCS Type D or expansive, when existing or proposed building is within 10 feet, and/or when land uses pose risk to groundwater contamination, use 16 mil minimum thickness impermeable liner under and on sides of the pavement sand and gravel media. Pervious Concrete Pavement Section
UDFCD BMP MONITORING SITES Pervious Concrete Pavement 38.00 Flow 26.00 54.00 Pervious concrete surface Cutoff wall Flow Concrete 5'' Gravel 7'' Sand 3'' Gravel 2.6'' Flow (to South Utility Vault) Underground overflow weir Flow (to North Utility Vault) Pervious Concrete Layout– Isometric North Utility Vault Section South Utility Vault Section
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Orchard Pond EDB - Flow Dissipater
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BMP Monitoring Sites - Urban Drainage and Flood Control District

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