UK RESEARCH INTO THE PERFORMANCE OF PERMEABLE PAVEMENT, RESERVOIR STRUCTURES IN CONTROLLING STORMWATER DISCHARGE QUANTITY AND QUALITY

The paper reports on a held study on a permeable, reservoir pavement c onstructed in 1986 at Nottingham, UK; surfaced with permeable, concret e block paving; and with a different sub-base stone-type in each of fo ur reservoirs, from which the discharges were monitored for quantity a nd water quality. Hydrological relationships involving rainfall, outfl ow, outflow duration and antecedent conditions are presented. Water qu ality parameters are shown to be stable in value after some six months , by which time surface contaminants on the sub-base stone had been wa shed out of the construction. As outflow volume is reduced and water q uality parameters (SS and Pb) are low in value, pollutant outflow load ings are significantly lower than with traditional, impermeable surfac es.