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6/05/2017 | 11:45 AM - 12:00 PM | STORMWATER MANAGEMENT BASINS AS LOCAL POINT SOURCES FOR ROAD SALT INPUT TO GROUNDWATER AND STREAMS, INCLUDING CONTRIBUTING TO ELEVATED NON-WINTER STREAM NA AND CL CONCENTRATIONS | 302A

STORMWATER MANAGEMENT BASINS AS LOCAL POINT SOURCES FOR ROAD SALT INPUT TO GROUNDWATER AND STREAMS, INCLUDING CONTRIBUTING TO ELEVATED NON-WINTER STREAM NA AND CL CONCENTRATIONS

Road salt application results in elevated Cl– and Na+ concentrations in ground and surface waters in (sub)urban areas and adjacent to roads. Elevated Cl– and Na+ concentrations have negative impacts on freshwater ecosystems and drinking water quality. We investigated the role that stormwater management plays in the movement of road salt from impervious surfaces to streams across a range of scales in suburban Baltimore, MD. Groundwater downgradient of two stormwater management basins (SMBs) showed year-round Cl– and Na+ concentrations of 100s–1000s of mg/L. The groundwater represents a year-round source of Cl– and Na+ to the adjacent second-order stream, and the high Na+ concentrations in the groundwater drive exchange reactions that significantly alter soil chemistry with likely long-term effects. At the scale of a fourth-order watershed, tributaries with SMBs have the same or higher Cl– concentrations throughout the year than tributaries without SMBs. SMBs do not protect streams from chronic or acute road salt contamination with pulse inputs documented via conductivity sensors. The SMBs instead shift some of the Cl– and Na+ inputs to non-winter months or subsequent years.

C10 Biogeochemistry
C08 Urban Ecology
S02 Urban streams, aquatic ecology, and stormwater engineering: How do we encourage integration, opportunities and collaboration in an era of green infrastructure innovation?

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Presenters/Authors

Joel Moore (), Towson University, joelmoore6@gmail.com;