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that the season of significant plant growth was well-approximated by using afive-day <br />temperature threshold of 42 degrees, as opposed to the 45 degrees mean temperature outlined in <br />TR-21. When applying the South Park - Walter coefficients for SPDSS, the growing season will <br />be defined by a mean temperature of 42 degrees for both spring and fall. <br />2.0 <br />1.8 <br />1.6 <br />1.4 <br />~ 1.2 <br />0 1.0 <br />U <br />0 <br />~j 0.8 <br />0.6 <br />0.4 <br />0.2 <br />0.0 <br />May June July Aug Sep Oct <br />--- Upper Limit Walter Recommended - - -Lower Limit <br /> _., <br />F,,,, <br />• <br />^ <br />^ ~s <br />•~ <br /> ^ <br />a <br /> .. i ---__ ,-~~~ <br />• ---r~~ <br /> <br />~ <br />--~- - ~ ~ <br />• - <br />- ^ ~ <br />~ • <br /> <br /> <br /> <br />Figure 2 - Lysimeter-Derived Grass Crop Coefficients Evaluated by Walter et al. <br />Task59_l.doc (updated January 11, 2008) 5 of 32 <br />Figure 3 - Lysimeter-Derived (Urass Crop Coel~'icients from the Smith Study <br />