To assist in delineating source water protection areas based on stream flow, a tool has been developed to calculate the time of travel (based on real-time stream flow measurements), decay, and dispersion of a pollutant introduced into surface waters. The tool allows the user to: select a location on a river to introduce a chemical or biological constituent, track the pollutant downstream, under real-time flow conditions, to a water supply intake, further
track the constituent to a water filtration plant, and identify the overall population served by the plant. The databases required for this tool include the Enhanced River Reach File (ERF1), the USGS real-time stream
flow measurements, and the EPA Safe Drinking Water Information System (SDWIS). The Arcview Network Analyst extension is used to integrate the databases and to provide the user with a tool to quickly assess the consequences of the introduction of a chemical or biological contaminant to the
source waters (surface water) of a public water supply.
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