1240815MAINTENANCE MANUAL rcd 3 12 2026

PART V - Porous Pavers System BMP#1 Porous Pavers System Overview Functionality Porous pavers systems are paved areas that produce less stormwater runoff than areas paved with conventional pavers. This reduction is achieved primarily through the infiltration of a greater portion of the rain falling on the area than would occur with conventional pavers. This increased infiltration occurs either through the pavers material itself or through void spaces between individual pavers blocks known as pavers. Porous pavers systems are divided into two general types. Each type depends primarily upon the nature of the Porous pavers surface course and the presence or absence of a runoff storage bed beneath the surface course. Porous pavers and permeable paver with storage bed systems treat the stormwater quality design storm runoff through storage and infiltration. Therefore, these systems have adopted TSS removal rates similar to infiltration structures. The adopted TSS removal rate for each type of Porous pavers system is from 80%. Porous pavers systems are used to reduce runoff rates and volumes from paved, on- grade surfaces such as patios, walkways, driveways, fire lanes, and parking spaces. Porous pavers systems with runoff storage beds achieve these reductions through storage of runoff and eventual infiltration into the subgrade soils. Through this infiltration process, these types of Porous pavers systems also achieve stormwater quality requirements. Proper care and attention in the long-term maintenance of the stormwater management measure is critically important to the safety and health of the public. Type of BMP – Dry Stormwater Management Measure The Porous pavers system shall fully drain within 72 hours of the most recent rainfall. Standing water in excess of 72 hours is a sign of the porous pavers failure. It may also contribute to mosquito breeding and other health and safety issues. At no time shall there be ponding on the surface of the pavers. 19