![]() This design provides some runoff flow attenuation, filtering, but no volume reduction. The underdrain typically discharges to a stormwater pond or storm sewer system. A second design variation includes a deep underlying reservoir consisting of open-graded, crushed rock above an impermeable layer of soil or a liner and an underdrain. This design provides water quality and quantity control by storing runoff and infiltrating it into the subgrade soils over an extended period of time. For instance, permeable pavement can be installed with a deep underlying reservoir consisting of open-graded, crushed rock. Permeable interlocking pavers consist of concrete or stone units with open, permeable spaces between the units.įor each of the above pavement surfaces, there are many variants depending on the design goals. Photo illustrating permeable interlocking concrete pavement.
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