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MEMORANDUM <br />December 13, 2013 <br />Issues with Selecting an Appropriate Crop Growth Stage Coefficient for the SCS Mod. Blaney <br />Page 23 of 34 <br /> <br />The monthly results from our calibrated coefficients were <br />along with the other curves for pasture grasses <br />represent the “upper plains.” <br />Figure 21 – Comparison of calculated irrigation requirement <br /> <br />The calibrated coefficients that the DWR <br />and are shifted upwards to the magnitude of the ASCE Standardized ET. <br />the Kersey Analysis, our calibration was within one percent of the ASCE <br />overestimated by more than five percent. <br /> <br />Year ASCE <br />(ETrs) <br />1993 30.38 <br />1994 34.95 <br />1995 27.63 <br />1996 31.34 <br />1997 29.47 <br />1998 32.7 <br />1999 28.83 <br />2000 34.08 <br />2001 30.99 <br />2002 32.88 <br />2003 32.12 <br />2004 33.6 <br />2005 33.29 <br />2006 35.72 <br />2007 38.57 <br />2008 37.34 <br />AVERAGE: 32.74 <br /> Table 18 – Calculated seasonal consumptive use amounts (inches) <br /> <br />0 <br />5 <br />10 <br />15 <br />20 <br />25 <br />30 <br />35 <br />40 <br />45 <br />1992 1994 1996 <br />An <br />n <br />u <br />a <br />l <br /> <br />C <br />r <br />o <br />p <br /> <br />W <br />a <br />t <br />e <br />r <br /> <br />R <br />e <br />q <br />u <br />i <br />r <br />e <br />m <br />e <br />n <br />t <br />SCS TR-21 <br />Task Memo 59.1 (Upper Plains) <br />ASCE, ETrs <br />DWR Calibrated Coefficients <br />Issues with Selecting an Appropriate Crop Growth Stage Coefficient for the SCS Mod. Blaney-Criddle Eqn. <br />The monthly results from our calibrated coefficients were compared to the Kersey Analy <br />pasture grasses (as shown in Figure 19) to see if they might better <br />Comparison of calculated irrigation requirement <br />the DWR calculated follows the same shape as the SCS TR <br />are shifted upwards to the magnitude of the ASCE Standardized ET. Over the 16 years analyzed <br />, our calibration was within one percent of the ASCE equation while <br />five percent. <br />SCS <br />TR-21 <br />SPDSS Task <br />Memo 59.1 <br />DWR <br />Calibration <br />25.17 31.04 29.39 <br />29.16 36.48 34.37 <br />25.13 29.83 28.45 <br />27.26 33.62 31.84 <br />26.75 32.15 30.69 <br />28.43 35.19 33.16 <br />26.58 32.29 30.64 <br />29.18 36.26 34.17 <br />29.08 36.18 34.05 <br />28.31 34.44 32.8 <br />28.6 35.9 33.6 <br />27.78 35.8 33.08 <br />28.66 35.64 33.58 <br />28.61 35.46 33.55 <br />30.41 38.5 35.79 <br />26.92 32.84 31.12 <br />27.88 34.48 32.52 <br />Calculated seasonal consumptive use amounts (inches) <br />1998 2000 2002 2004 2006 2008 <br />Year <br />Task Memo 59.1 (Upper Plains) <br />DWR Calibrated Coefficients <br />Criddle Eqn. <br />compared to the Kersey Analysis and plotted <br />to see if they might better <br /> <br />the same shape as the SCS TR-21 results <br />Over the 16 years analyzed in <br />while Task Memo 59.1 <br />2008 2010