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<br />~ <br /> <br />, <br /> <br />stormwater systems. Thus, a unified set of accounting practices is used to <br />estimate the costs of providing these services. These costs will be assigned <br />to individual parcels. <br />GIS Information <br />Boulder County has GIS coverage for the entire county. The City of <br />Boulder has AutoCAD files for its infrastructure. The tax assessor's data- <br />base is also available. <br />Water Quality Data <br />Excellent records are available on aggregate influent and effluent water <br />quality. Supplementary water quality sampling in Boulder Creek will be <br />needed to estimate the hourly variability of water quality during critical <br />periods. <br />Hydropower Production <br />Hydropower data will be obtained from Public Service Co. of Colorado who <br />operates Barker Dam in cooperation with the City of Boulder. They have <br />already provided over 20 years of historical data. <br /> <br />- <br /> <br />. <br /> <br />4.0 Proposed Methodology <br /> <br />A major goal of this research is to develop new methods to evaluate the <br />impact of watershed changes on UWEISs. These methods will be based on an <br />integrated risk management framework with applications to design and opera- <br />tion of sustainable UWEISs. During the first year of the project, a continu- <br />ous simulation model with a one hour time step will be developed that will <br />simulate the operation of the BCW and the City of Boulder UWEIS for calendar <br />year 1996. This model will include surface-groundwater interactions. We <br />will also simulate the behavior of the system for the major flood (1894) and <br />drought (1954) of record. Existing models and databases will be used for <br />this exercise. <br />SWMM will be used as the primary urban water management model with <br />linkages to other models as needed. The main components of SWMM and their <br />current status are discussed below: <br />Runoff Block. The Runoff Block can be used to estimate sanitary as well as <br />stormwater flows. Indeed the dry-weather flow estimating routine in SWMM is <br />the original version of the MAIN model which is the most popular water demand <br />estimating model. RUNOFF is widely used. A key missing component in the <br />current SWMM is the failure to account for the effect of lawn watering on the <br />antecedent conditions for estimating runoff. This feature will be added. <br />Transport ~ and Extran. These blocks have become the heart of SWMM since <br />they permit complex hydraulics to be simulated including flow in pressure <br />systems. Extran has been particularly useful in looking at combined sewer <br />systems where surcharging is common. . These models will be used without major <br />changes. <br />Storaae/Treatment Block. The Storage/Treatment Block has not been widely <br />used. One reason is the complexity of modeling the dynamics of treatment <br />processes. Only recently has this capability become available in a model <br />called GPS-X (Barnett and Takacs 1993). This model will be used to evaluate <br />how Boulderls wastewater treatment system performs under dynamic loading <br />associated with storm events. <br />Receivina Water. The Receiv Block of SWMM is not widely used. What is <br />needed is a capability for doing continuous simulation of receiving water <br />quality. Recent work by Chapra and his students should provide this capabil- <br />ity (e.g. Chapra and Byars 1995). <br />Manaaement. The early versions of SWMM contained a limited cost estimating <br />capability. Earlier attempts to include system optimization did not prove <br /> <br />9 <br />