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Table 3-2 Streamflow Classification of Calibration Periods <br /> South Platte at Kerse South Platte at Henderson Poudre near Greele <br />Period of Record (POR) (1901 to 2006) (1926 to 2006) (1903 to 2006) <br /> Average % Average % Average <br /> sheainflow Difference streamflow Difference streamflow Difference <br /> (af/ yr) from POR (af/ yr) from POP (af/ yr) from POR <br /> Avery re Avery re Avery ~e <br />Entire Period of Pecord 640,400 --- 313,100 --- 98,100 --- <br />Study Period [1950- 2006] 719,900 12% 457,100 8% 130,500 18% <br />Steady-state Calibration 553,300 -14% 261,880 -16% 82,800 -16% <br />Period [1991-1991] <br />Transient Calibration 586,600 -8% 327,600 5% 91,100 -7% <br />Period [1999-2005] <br />3.1.3 Precipitation <br />Annual precipitation data totals at three precipitation gages with long-term records that were <br />spatially distributed in tlne study area were obtained and evaluated. These gages are: <br />• Byers 5 ENE, <br />• Fort Collins, and <br />• Denver Stapleton International Airport. <br />For each of tlne gages the period of record average was compared with proposed steady-state <br />and transient calibration tinge periods. As shown in Table 3-3, there is relatively little variation <br />lln average precipitation between the period of record average and the calibration periods, with <br />the steady-state period showing slightly higher precipitation and the transient period showing <br />slightly less. The transient period iincludes some of the highest 20.68 in (Ft Collinns, 1999) and <br />lowest 7.68 in (Byers, 2002) annual precipitation amounts duriing the study period, as shown in <br />Figure 3-6. <br />Table 3-3 Climate Classification of Calibration Periods <br /> BYERS 5 ENE. FORT COLLINS DENVER STAPLETON <br />Period of Pecord (1948 to 2006) (1900 to 2006) (1948 to 2006) <br /> Average Difference Average Difference Average Difference <br /> pre~pitation from POR Precipitation from POR Pre~pitation from POR <br /> (ink r) Avery ~e (ilia r) Avery re (ink r) Avery re <br />Entire Period of <br /> <br />Record 11.96 --- 15.13 --- 15.17 --- <br />Study Period [1950 ° <br />to 2006] 11.96 0% 15.19 0 /0 15.15 0 /o <br />Steady-state <br />Calibration Period 15.29 2% 16.10 8% 15.15 0% <br />[1991 to 1991] <br />Transient <br />Calibration Period 11.71 -2% 15.15 0% 11.97 -3% <br />[1999 to 2005] <br />P~ SPDSS T~8 2 Final TM 10-08-0t~.doc 8 <br />