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sites) as well as historic temperature and precipitation data available from various <br />sources. <br />The PI's, in consultation with the WWA, will decide how historic temperature <br />and precipitation data should be adjusted in each hydrology model to generate <br />new streamflows for five different climate change scenarios. <br />a. These data are referred to as the Delta TP scenarios. They will be based <br />on downscaled GCM output representing five wide - ranging future climate <br />possibilities. <br />b. It is expected that the scenario results will range from relatively low future <br />streamflow to relatively high streamflow. <br />c. The seasonal distribution of the anticipated wanning, the variability by <br />year type (dry, average, or wet), and predicted changes in precipitation <br />patters and amounts were also considered when the PSC and WWA <br />designed its scenarios. <br />d. The future years to be assessed will be 2040 and 2070. <br />e. These Delta TP scenarios can be further used by the water providers to <br />estimate future water use. <br />3. Run each Delta TP scenario through the historically calibrated hydrology models <br />to generate scenarios for future natural streamflow. <br />4. Each water provider will use the modified natural streamflows in conjunction <br />with water rights allocation assumptions to estimate how various climate change <br />scenarios may affect the yield of its water system. The Delta TP scenarios could <br />also be used in demand models to estimate the effect on water usage. <br />RESULTS AND SUPPLEMENTARY WORK <br />The results from each method contain weekly streamflow data sequences representing <br />future time periods. For each gauge, there are 20 different streamflow sequences (5 of <br />scenarios * 2 of hydrology models * 2 future years) for providers to use for modeling <br />purposes. There will be two additional streamflow sequences coming from the <br />preliminary static temperature increase sensitivity analysis. These sequences should <br />provide a wide range of future possibilities for entities to use in conjunction with their <br />water rights allocation assumptions to establish potential vulnerabilities to their systems. <br />It may also aid in drought planning, supply and demand management, and infrastructure <br />operation changes. <br />The outcomes of this research will grant Colorado water providers the information <br />necessary to establish the first steps towards the evaluation of their water supply and <br />demand in the face of climate changes. These results may eventually be used in <br />conjunction with large -scale water rights analysis, which is required to project future call <br />patterns associated with streamflow changes. This type of analysis is done to provide <br />each streamflow scenario with an associated call patter. <br />Future analysis requested by the providers may be a comparison on an annual basis of the <br />generated streamflows from the climate scenarios with a reconstruction of streamflows <br />