title: Impact of storm water on groundwater quality below retention/detention basins.
abstract: Groundwater from 33 monitoring of peripheral wells of Karachi, Pakistan were evaluated in terms of pre- and post-monsoon seasons to find out the impact of storm water infiltration, as storm water infiltration by retention basin receives urban runoff water from the nearby areas. This may increase the risk of groundwater contamination for heavy metals, where the soil is sandy and water table is shallow. Concentration of dissolved oxygen is significantly low in groundwater beneath detention basin during pre-monsoon season, which effected the concentration of zinc and iron. The models of trace metals shown in basin groundwater reflect the land use served by the basins, while it differed from background concentration as storm water releases high concentration of certain trace metals such as copper and cadmium. Recharge by storm water infiltration decreases the concentration and detection frequency of iron, lead, and zinc in background groundwater; however, the study does not point a considerable risk for groundwater contamination due to storm water infiltration.
authors.affiliation: Department of Environmental Sciences, Federal Urdu University of Arts, Science & Technology, Karachi, Pakistan. drarifzubair@yahoo.com
authors.forename: Arif
authors.initials: A
authors.lastname: Zubair
authors.forename: Asif
authors.initials: A
authors.lastname: Hussain
authors.forename: Mohammed A
authors.initials: MA
authors.lastname: Farooq
authors.forename: Haq Nawaz
authors.initials: HN
authors.lastname: Abbasi
mesh_terms: D004784:Environmental Monitoring / Q000379:methods*; D005618:Fresh Water / Q000032:analysis; D010154:Pakistan; D014873:Water Pollutants / Q000032:analysis*
chemical_list: D014873:Water Pollutants