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Event‐Based Stormwater Quality and Quantity Loadings from Elevated Urban Infrastructure Affected by Transportation
Author(s) -
Sansalone John J.,
Hird Jonathan P.,
Cartledge Frank K.,
Tittlebaum Marty E.
Publication year - 2005
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.1002/j.1554-7531.2005.tb00294.x
Subject(s) - particulates , surface runoff , environmental science , first flush , hydrology (agriculture) , total suspended solids , urban runoff , total dissolved solids , gradation , water quality , stormwater , environmental engineering , organic matter , environmental chemistry , chemical oxygen demand , wastewater , chemistry , geology , geotechnical engineering , ecology , organic chemistry , computer science , computer vision , biology
Urban‐rainfall runoff affected by transportation is a complex matrix of a very wide gradation of particulate matter (<1 to >10 000 μm) and dissolved inorganic and organic constituents. Particulate matter transported by rainfall runoff can be a significant vector for many reactive particulate‐bound constituents, particularly metal elements. The water quality and hydrology of nine events from a representative elevated section of Interstate 10 (I‐10) (eastbound average daily traffic load of 70 400 vehicles) in Baton Rouge, Louisiana, were characterized and compared with respect to the passage of each hydrograph. Residence time on the paved concrete surface was less than 30 minutes for all events. Results indicate that event‐mean concentrations (EMCs) of particulate matter as total‐suspended solids (TSS) (138 to 561 mg/L) and chemical‐oxygen demand (COD) (128 to 1440 mg/L) were greater than those found in untreated municipal wastewater from the same service area. Particulate‐matter dissolution and COD partitioned as a function of pH, pavement residence time, and organic content. In general, delivery of mass for aggregate indices, such as particulate matter (measured as TSS) and COD mass, were driven by the hydrology of the event, while concentrations of aggregate‐constituent measurements, such as total‐dissolved solids (TDS), illustrated an exponential‐type decline during the rising limb of the hydrograph. Despite the short residence times, wide solids gradation, partitioning, and complexity of the rainfall‐runoff chemistry, conductivity and dissolved solids were strongly correlated. Characterization of the transport and loads of constituents in urban‐rainfall runoff, as a function of hydrology, is a necessary first step when considering treatability, structural or nonstructural controls, and mass trading for discharges from paved infrastructure.