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South Boulder Creek near Eldorado Springs. CO <br />Reconstructed <br />120 <br />100 <br />00 <br />3 60 <br />LL 40 <br />20 <br />0 <br />1560 1600 1650 1700 1750 11100 1550 1900 1950 <br />Wear Year <br />South Boulder Creek near Eldorado Springs. CO <br />— observed —Reconstructed <br />1910 1920 1930 1940 <br />1950 1900 1970 1950 1990 2000 <br />9W sr Yen <br />Drought Planning Tree Ring Data <br />Climate Change <br />• Winter Precip Increase 10-20% <br />• Summer Precip Decrease 5-15% <br />• Late Summer Stream Flows <br />Decrease 8-10% <br />• Irrigation Demands Increase 5-15% <br />• Reservoir Evaporative Losses <br />Increase <br />• Weather Extremes Increase <br />• Storage becomes more important. <br />• Outdoor Watering Efficiency <br />becomes more important. <br />41, <br />1200 <br />awe <br />000 <br />600 <br />460 <br />200 <br />0 <br />Nav <br />600 <br />700 <br />609 <br />,i 500 <br />v A00 <br />300 <br />200 <br />100 <br />D <br />Nov Der Ian Feb Mar Apr May Jun Jul Aug Sep Ott <br />Climate Change Shift -Potential Demand Impacts a —Ave Current Demand <br />Figure 3 <br />Potential Runoff Timing Shift <br />Dec Fan Feb Mar Apr May Jun Jul Aug Sep Oct <br />Climate Change Shift - Future Potential. Runoff Hydrograph <br />Ave Historical Runoff Hydrograph <br />Figure 4 <br />Potential City Demand Shift <br />18 <br />