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                <gco:CharacterString>Field Experiment and Data Collection A continuous tracer injection was initiated on January 7, 1992. Water samples were collected at 8 locations downstream (0, 9, 213, 457, 610, 762, 945, and 1052 m downstream of the injection). Field Sample Analysis Samples were filtered and analyzed for lithium (flame AA spectroscopy) and bromide (ion exchange chromatography). Model approach Inversse modeling to fit advection-dispersion-storage model to observed tracer breakthrough curves. &#160;Estimated parameters represent average values for each model reach. Modeling code used Study consisted of both flow and transport modeling. A kinematic wave model based on DR3M was used to develop a time-series of flow and cross-sectional area. These time series were used as input to the OTIS solute transport model (software). &#160; The routing model is not publicly available (although the DR3M is at&#160;http://water.usgs.gov/software/DR3M/). &#160; OTIS available at: http://water.usgs.gov/software/OTIS OTIS Model input files:&#160;We provide copies of the OTIS input parameter in files in a zipped archive. Routing input files are not available. Software : DR3M&#160;dr3m - Distributed Routing Rainfall-Runoff Model--version II Published in 1982 Authors: &#160;W. M. Alley, P. E. Smith, D. R. Dawdy Description:&#160;DR3M is a watershed model for routing storm runoff through a Branched system of pipes and (or) natural channels using rainfall as input. DR3M provides detailed simulation of storm-runoff period selected by the user. There is daily soil-moisture accounting between storms. 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Methodology:&#160;&#160;The rainfall-excess components include soil-moisture accounting,&#160; pervious-area rainfall excess, impervious-area rainfall excess, and&#160;parameter optimization. &#160;The Green-Ampt equation is used in the&#160;calculations of infiltration and pervious area rainfall excess. &#160;A&#160;Rosenbrock optimization procedure may be used to aid in calibrating&#160;several of the infiltration and soil-moisture accounting parameters.&#160;Kinematic wave theory is used for both overland-flow and channel&#160;routing. &#160;There are three solution techniques available: &#160;method of&#160;characteristics, implicit finite difference method, and explicit&#160;finite difference method. &#160;Two soil types may be defined. &#160;Overland flow may be defined as turbulent or laminar. &#160;Detention reservoirs&#160;may be simulated as linear storage or using a modified-Puls method.&#160;Channel segments may be defined as gutter, pipe, triangular cross&#160;section, or by explicitly specifying the kinematic channel&#160;parameters alpha and m. 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