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<br />001733 <br /> <br />10 <br /> <br />temperature, provide the ability to further refine and verify the existing models, as well as develop <br />new models. Through time, as the various model capabilities are advanced, the Physical Science <br />program intends to work with the Socio-Cultural and Biology program areas to develop additional <br />ecological simulations for the CRE. Advanced modeling predictions can then be used to better focus <br />the planning process for longer-term experimental designs that may be considered for <br />implementation. <br />Physical Science and DASA Updates - Following, are descriptions and updates on current <br />knowledge related to the individual elements of the Physical Science, Modeling and DASA program <br /> <br />area. <br /> <br />Inteerated Quality-or-Water Proeram Upstream Component - Lake Powell <br /> <br />Lake Powell Prolonged drought conditions in the Colorado River Basin and a high test <br />flow in November 2004 have contributed to low Lake Powell elevations. Elevations following <br />November's release were at 3567.4 ft. This elevation is similar to that seen in the 1970's when <br />the reservoir was still filling. Storage in the reservoir was at 36% of live capacity (U.S. Bureau <br />of Reclamation, http://www.usbr.gov/uc/water/crsp/cs/gcd.html) in December 2004. <br />As the warmer surface layers of the reservoir come closer to the penstock withdrawal <br />elevation, increased release temperatures during the summers were recorded in 2003 and 2004. <br />Release temperatures reached 120C in September 2003 and 140C in September 2004, the warmest <br />temperatures observed for that time of year since 1973. Dissolved oxygen levels were at very low <br />levels throughout the reservoir in September 2003 owing to resuspension of deltaic sediments. <br />The GCMRC long-term monitoring program for Lake Powell continues, with monthly <br />forebay and quarterly reservoir surveys. These surveys consist of the collection of a profile of <br />physical and chemical parameters through the water column, sampling at discrete depths for <br />major ion and nutrient concentrations, and biological sampling for chlorophyll, phytoplankton, <br />and zooplankton at selected stations in the reservoir forebay, main channel, and major tributary <br />arms of the reservoir. Continuous water quality monitors are in place for thermal monitoring in <br />the reservoir forebay and in the reservoir tailwater. <br />The database (WQDB) for Lake Powell and Grand Canyon water quality is nearing <br />completion and being integrated with GCMRC's Oracle database management system. These <br />data comprise all Bureau of Reclamation, GCES, and GCMRC water quality monitoring <br /> <br />GCMRC FY2006 Annual Work Plan (Draft February 15,2005) <br />