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<br />? <br /> <br />. <br /> <br />- <br /> <br />most of the costs, then we have an unacceptable situation. Using ABC and the <br />tax assessors' database, costs and benefits can be assessed at the individual <br />parcel level (Heaney and Dickinson 1982, Heaneyet al. 1991). This approach <br />is becoming increasingly feasible with the use of GIS which provides this <br />disaggregated level of information. <br />A major restructuring of the application of benefit-cost procedures <br />would be needed to require a uniform application of these principles within <br />and across federal water agencies. Interestingly, a recent high level inter- <br />agency committee report recommends such action (U.S. Advisory Commissiop on <br />Intergovernmental Relations 1993). Thus, for our purposes, we will quantify <br />benefits using proper procedures without the limitations facing individual <br />federal agencies. In summary, the suggested analytical approach to use is as <br />follows: <br /> <br />1. Estimate benefits by purpose but keep accounts for all affected groups. <br />2. Develop a high quality database so that the estimates are creditable. <br />3. Develop and calibrate a continuous simulation model to perform <br />this analysis. <br /> <br />Using the tax assessor's database, it is feasible to estimate the incidence <br />of benefits and costs at the individual parcel level. <br /> <br />3.0 Boulder Creek Watershed and the City of Boulder <br /> <br />3.1 The Watershed <br /> <br />Boulder Creek Watershed (BCW) is an exceptional watershed to study <br />environmental infrastructure systems. BCW is a textbook watershed with a <br />drainage area of 1140 km2. Its elevation ranges from over 4,000 m. to 1530 m. <br />Precipitation ranges from more.than 75 cm in the mountains to less than 40 cm <br />in the valley. Land uses run the spectrum from forests, farms, urban and <br />suburban development, mining, wetlands, and large open space areas. BCW <br />contains four ecoregions ranging from high elevation tundra to flat to roll- <br />ing cropland (Dennehyet al. 1993). The first symposium on BCW was held in <br />November 1994 under co-sponsorship of the University of Colorado and the City <br />of Colorado. <br /> <br />3.2 City of Boulder UWEIS <br /> <br />BOW has a rich variety of infrastructure system problems and databases <br />as summarized below: <br />multiple reservoirs, <br />water supply source for the City of Boulder, <br />hydropower development, <br />long history of flooding problems, <br />high valued recreational use, <br />strong public awareness, <br />instream flow needs, <br />discharge of Boulder's wastewater effluent to Boulder Creek, <br />agricultural water use, <br />award winning urban stream restoration, <br />location of a Long-term Ecological Research (LTER) site, <br />complex water law documented with simulation models, <br />Arc-Info GIS coverage for Boulder County, <br />Tax Assessor's database integrated with GIS, <br /> <br />7 <br />