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<br />UU~U/J <br /> <br />- <br /> <br />water distribution system model for entire city of Boulder, <br />natural and man-made wetlands in basin, <br />long-term hydrologic and meteorologic databases, and <br />availability of a rich collection of water resources studies <br />covering the past century. <br /> <br />3.3 Database <br />Precipitation <br />In addition to the uaual sources of precipitation data, the BCW and <br />Boulder have a much more complete precipitation network as part of the Flood <br />Warning System. Provision needs to be made to have these data stored during <br />1996. We also have access to radar rainfall estimates to better describe the <br />spatial variability of individual storm events. <br />Runoff <br />An extensive stream gaging network exists within the BCW. The City of <br />Boulder has done a complete inventory of its storm drainage system. Selected <br />catchments will be measured to calibrate the runoff models. Extensive com- <br />parable information is available from the Urban Drainage District which has <br />collected such information over the past 25 years as part of 208, NURP, <br />NPOES, and other studies, Also, a calibrated NWS runoff model is available <br />for 8CW. <br />Evapotranspiration <br />Evapotranspiration measurements are available from the NSF LTER site for <br />the alpine portion of the BCW. Within the City of Boulder, reliable E-T <br />estimates are available as the residual of metered water use. The results of <br />the Heatherwood studies provide detailed information on E-T which can be <br />accurately estimated using the monthly water use data with more detailed <br />calibration for the 16 study houses. This database includes accurate infor- <br />mation on the actual irriqable area. Anther source of detailed E-T data is <br />the U. of Colorado campus real-time control irrigation system which includes <br />a separate on-campus weather station. Finally, the City has supported stud- <br />ies of the effectiveness of using soil moisture sensors to monitor water use <br />in public open space. Supplemental data will be collected as needed. <br />Water Demand <br />A detailed database of diversions and return flows from sew is available <br />because the prior appropriations water law requires such an accounting sys- <br />tem. The City of Boulder has the most recent six years of monthly water data <br />for all customers. 'Aggregate water deliveries for the system are available <br />on an hourly basis. Finally, the unique Heatherwood database of over 15,000 <br />individual water using events is available (Mayer 1995). <br />Wastewater Flows <br />Aggregate wastewater influent to the single wastewater treatment plant <br />is available. Infiltration and inflow (1/1) can be deduced from an analysis <br />of the water demand data. The spatial variability of III is not known. <br />Groundwater <br />The City relies on surface water sources for its supply. Groundwater <br />levels are measured at several locations. Thus, it should be possible to <br />evaluate seasonal changes in the groundwater table and its impact on other <br />components of the system such as sewer infiltration. <br />Floodplain Delineation and Daaages <br />Complete floodplain delineations have been done for the City of Boulder. <br />Also, damage estimates for individual parcels have been done for the central <br />part of the city where the flood hazard is greatest. <br />Cost of Providing Utility Services <br />The City of Boulder owns and operates the water supply, wastewater, and <br /> <br />8 <br />