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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 7 of 34 <br /> <br />with their average, and the SCS TR <br />1275 were reported from the following locations: <br /> <br /> <br />Location <br />Mandan <br />Davis <br />Murrietta <br />Merced <br />Pasadena <br /> Table 5 – Locations of pasture grass data from ARS 1275 <br /> <br />The ARS 1275 coefficients represent an average elevation of <br />Chart 1 (Appendix B), average data <br />Visually this is evident as well. The curve for <br />Bromegrass and “irrigated pasture.” <br /> <br />Figure 2 - kc vs. month for Pasture Grasses <br /> <br />Change-of-use analyses that evaluate irrigated pasture or lands that were historically hayed might <br />consider using the crop growth stage coefficie <br />conditions. Table 5 includes these k <br /> <br /> <br />0.00 <br />0.20 <br />0.40 <br />0.60 <br />0.80 <br />1.00 <br />1.20 <br />1.40 <br />0 2 <br />Bromegrass -Mandan, ND <br />Irr. Pasture -Davis, CA <br />Irr. Pasture -Murrietta, CA <br />Irr. Pasture -Merced, CA <br />Average of ARS 1275 <br />SCS TR-21 Pasture Grasses <br />Issues with Selecting an Appropriate Crop Growth Stage Coefficient for the SCS Mod. Blaney-Criddle Eqn. <br />with their average, and the SCS TR-21 curve for pasture grasses as shown in Figure 2 <br />1275 were reported from the following locations: <br /> Elevation <br /> State Crop (m) (ft) <br /> ND Bromegrass 502 1,647 <br />CA Irrigated Pasture 16 52 <br /> CA Irrigated Pasture 334 1,096 <br />CA Irrigated Pasture 52 171 <br />Pasadena CA "lawn grass" 263 864 <br />Locations of pasture grass data from ARS 1275 <br />represent an average elevation of 742 feet above sea level. <br />verage data from ARS 1275 did show a strong relationship to TR <br />he curve for “pasture grasses” in SCS TR-21 is not represented well by <br /> <br />vs. month for Pasture Grasses <br />use analyses that evaluate irrigated pasture or lands that were historically hayed might <br />stage coefficients directly from ARS 1275 depending on site specific <br />kc coefficients, which have been adjusted from the published <br />4 6 8 10 <br />Mandan, ND <br />Davis, CA <br />Murrietta, CA <br />Merced, CA <br />Average of ARS 1275 <br />21 Pasture Grasses <br />Criddle Eqn. <br />2. Data from ARS <br />above sea level. As shown in <br />to TR-21 (R2 = 0.505). <br />not represented well by <br /> <br />use analyses that evaluate irrigated pasture or lands that were historically hayed might <br />depending on site specific <br />coefficients, which have been adjusted from the published k values. <br />12