The authors have undertaken intensive road run-off monitoring programmes at sites in Auckland. The sites have negligible drainage onto the road from adjacent buildings and land surfaces, accessible stormwater networks that carry runoff only from easily delineated road surface catchments and high vehicle use. Weirs and flow recorders were installed in the stormwater networks and automatic run-off samplers were placed over the access manholes. Vehicle numbers and size, atmospheric particulates and PAHs, gases, wind speed and direction and rainfall were monitored continuously. A contaminant accumulation/run-off model was developed and fitted to the measured metal concentrations in the road run-off to provide estimated concentrations for each minute of the monitoring periods. From these estimates, the vehicles counts and the lengths of the road catchments, the contributions of metals in the run-off per vehicle kilometre were calculated. (Author/publisher) For the covering entry of this conference, please see ITRD abstract no. E210413.
Samenvatting