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<br />W A/CD vs DPIW A: Cottonwood Format
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<br />100 150 200
<br />Water Applied 1 Potential CU
<br />
<br />250
<br />(%)
<br />
<br />300
<br />
<br />350
<br />
<br />Assume:
<br />CU = 700 mm/season, 153 day$ per season (May I - September 30)
<br />Cottonwood Curve:
<br />55<WA/CU<160
<br />W A/CU> 160
<br />Gronning Line:
<br />WA' = IWA * 25.4 mm/in * 153 days/season
<br />DP' = ((0.546 * IWA) - 0.019) * 25.4 mm/in * 153 days/season
<br />
<br />DP/W A ~ 0.357 * W A1CU - 19.6
<br />DP/WA = 100 * (WA/CU-IOO)/(WA/CU)
<br />
<br />Water Application vs Deep Percolation: Gronning Line Format
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<br />I CottorJwood Curve :
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<br />0.1 0.15 0.2
<br />Water Application
<br />
<br />0.25
<br />(in/day)
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<br />
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<br />0.4
<br />
<br />Gronning Line:
<br />Net DP = (0.546' IWA). 0.019
<br />
<br />Assume:
<br />CD = 700 mm/season
<br />Season Lengh = 153 days
<br />(May 1 . September 3D)
<br />
<br />Cottonwood Curve:
<br />DP ~ 0.357 (WA^2)/CU. (0.196 'WA)
<br />
<br />Fig.2. Water Application -- Deep Percolation Relationship in Cottonwood and Gronning Formats
<br />
<br />6
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