WATER QUALITY DURING STORM EVENTS FROM TWO CONSTRUCTED WETLANDS RECEWING MINE DRAINAGE

Lloyd R. Stark, Robert P. Brooks, Frederick M. Williams, S. Edward Stevens, Luise K. Davis

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

ABSTRACT: Flow rates, pH, iron concentration, and manganese concentration were measured during several storm events at two constructed wetlands receiving mine water. During a substantial rain event, flow rates at both the wetland outlets surpassed flow rates at the wetland inlets, reflecting incident rainfall and differences in wetland area at the two sites. A significant positive correlation existed between local rainfall and outflow rates at the larger wetland, but not between rainfall and inflow rates. During storm events, outlet pH, relative to inlet pH, was slightly elevated at the larger wetland, and depressed at the smaller wetland. However, over the course of one year, rainfall was uncorrelated to outlet pH in the larger wetland. A substantial rain event at the smaller wetland resulted in a temporary elevation in outlet iron concentrations, with treatment efficiency reduced to near zero. However, in the larger wetland, outlet iron concentrations were not significantly affected by storm events. Although rainfall and outlet iron concentration were not significant correlates at the larger wetland, flow rate was positively correlated to outlet iron concentration. A normal manganese treatment efficiency of 50 percent at the smaller wetland was reduced to zero during a heavy rain.

Original languageEnglish (US)
Pages (from-to)639-650
Number of pages12
JournalJAWRA Journal of the American Water Resources Association
Volume30
Issue number4
DOIs
StatePublished - Aug 1994

All Science Journal Classification (ASJC) codes

  • Ecology
  • Water Science and Technology
  • Earth-Surface Processes

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