STORMWATER CHARACTERISTICS ON 3RD MAINLAND BRIDGE LAGOS, NIGERIA

Stormwater from highways contain pollutants from vehicular activity. Vehicle emissions include pollutants such as heavy metals, oil and grease and particulates which settle on the highway. To understand the magnitude and nature of stormwater, the quality of highway stormwater runoff from 5 points on 3rd Mainland bridge in Lagos, Nigeria was monitored on monthly basis for a period of three years for 22 different parameters. Samples were analyzed for stormwater events (SWEs) using standard procedures. Inter-parameter correlations of event mean concentrations (EMCs) were also carried out. Best Management Practices (BMPs) were investigated for concentration reduction in SWEs.