Effective Treatment of Stormwater using a Macro Pervious Pavement System MPPS

The prestigious Water Research magazine has published a paper co-authored by Professor Alan Newman of Coventry University, Douglas Aitken and Blanca Antizar-Ladislao of The University of Edinburgh detailing the results of a two-year field monitoring exercise investigating the stormwater quality performance of a macro-pervious pavement car park installation equipped with channel drain based oil and silt retention devices. The source control SUDS solution was designed by EPG for a car park at Perth Prison that discharges into a water course under SEPA jurisdiction.

An abstract of this very interesting scientific article is given below and the full paper is free to download at http://www.sciencedirect.com/science/article/pii/S0043135413006039

Abstract

This paper reports the results of a two year field monitoring exercise intended to investigate the pollution abatement capabilities of a novel system which offers an alternative to the, now well established, pervious pavement system as a source control device for stormwater management. The aim of this study was to determine the effectiveness of a live installation of a macro-pervious pavement system (MPPS) (operated as a visitors’ car park at a prison in Central Scotland) in retaining and treating a range of pollutants which originate from automobile use or become concentrated on the parking surface from the wider environment. The MPPS is a sub-class of pervious pavement system where the vast majority of the surface is impermeable. It directs stormwater into a pervious sub surface storage/attenuation zone through a series of distinct infiltration points fast enough to prevent flooding during the design storm. In the particular system studied here the infiltration points consist of a network of oil/silt separation devices with extensive further pollutant retention/degradation provided during the passage of stormwater through the sub surface zone. Approximately 12 months after the car park was completed a sampling regime was instigated in which grab samples were collected at intervals from each of the three sub catchments whilst, simultaneously, samples were collected directly from the, pollutant retaining, infiltration devices. Through investigation of samples collected at the upstream end of the system, the retention of significant amounts of hydrocarbons and heavy metals in the initial collection devices has been illustrated and the analysis of effluent samples collected at the outlet points indicate that the system is capable of producing effluent which is of a standard comparable to that expected from a traditional pervious pavement system and is acceptable for direct release into a surface water receptor. The system offers the opportunity to accrue the benefits of a pervious pavement when the use of traditional paving surfaces is the preferred option.

EPG is very proud to have been involved with this innovative and effective approach to stormwater management.

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