HR: 1330h
AN: B33A-02 [Abstracts]
TI: DOC, Color and Disinfection By-Product Precursor Dynamics along an Urbanization Gradient, Croton Water Supply System, New York, USA
AU: * Hassett, J M
EM: jhassett@esf.edu
AF: College of Environmental Science and Forestry, State University of New York
1 Forestry Drive, Syracuse, New 13210 United States
AU: Mitchell, M J
EM: mitchell@mailbox.syr.edu
AF: College of Environmental Science and Forestry, State University of New York
1 Forestry Drive, Syracuse, New 13210 United States
AU: Burns, D A
EM: daburns@usgs.gov
AF: Watersheds Research Section, U. S. Geological Survey
425 Jordan Road
, Troy, New 12180-834 United States
AU: Heisig, P M
EM: pmheisig@usgs.gov
AF: Watersheds Research Section, U. S. Geological Survey
425 Jordan Road
, Troy, New 12180-834 United States
AB:
Hydrologic processes in suburban watersheds and their effects on water quality warrant investigation. Biweekly and storm
samples were collected and analyzed for base cations, selected anions, and DOC over a one-year period at the outlet of three
small (37 - 55 ha) watersheds (one forested, two with different degrees of suburban development) in the Croton Watershed,
southeastern New York. Less frequent sampling for Pt/Co color and disinfection by-product precursors (DBPs) were also
conducted. Median baseflow concentrations (>3 days since rainfall) of DOC were similar, ranging from 2.1 to 1.8 to 1.7 mg L -1 for the most urbanized to the forested watershed, respectively. On a unit area load basis (kg ha-1 yr-1),
the range was from 8.9 to 6.4 to 5.1, again from most urbanized to forested watershed. All three watersheds showed similar
storm responses, with evidence for a flushing mechanism in that DOC concentration increased with increasing discharge. Pt/Co color and DBPs (determined as both total trihalomethane and total haloacetic acid formation potentials) showed similar storm behavior, although the range of response was greater than observed for DOC, suggesting a labile DOC fraction was
mobilized during storm events. The more urbanized watersheds tended to favor brominated over chlorinated forms of DBPs; the
reasons for this are unclear.
DE: 0400 Biogeosciences
DE: 1803 Anthropogenic effects
DE: 1860 Runoff and streamflow
DE: 1871 Surface water quality
SC: Biogeosciences [B]
MN: 2005 Joint Assembly