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CRDSS_Task1_14-15_Penman-Monteith Equation
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CRDSS_Task1_14-15_Penman-Monteith Equation
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Last modified
9/25/2011 10:18:50 AM
Creation date
5/29/2008 9:45:47 AM
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Decision Support Systems
Title
CRDSS Task 1.14-15 - Consumptive Use Model - Penman-Monteith Equation
Description
This task memoradum describes the Penman-Monteith (PM) reference crop equation and its use in the consumptive use (CU) model.
Decision Support - Doc Type
Task Memorandum
Date
1/9/1995
DSS Category
Consumptive Use
DSS
Colorado River
Basin
Colorado Mainstem
Contract/PO #
C153658, C153727, C153752
Grant Type
Non-Reimbursable
Bill Number
SB92-87, HB93-1273, SB94-029, HB95-1155, SB96-153, HB97-008
Prepared By
Riverside Technology inc.
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Table 2 shows the grass based basal crop coefficients and Kcb values (REF_GRASS) from Jensen et al. <br />(1990) and modified for the CRDSS. <br />TABLE 2 <br />GRASS BASAL CROP COEFFICIENTS AND Kcb VALUES <br />CROP SUGAR <br />TYPE BEANS BARLEY CORN BEETS VEGETABLE <br />DAYS TO 55 70 72 87 55 <br />FULL <br />COVERS <br />SERIES DAYS COEFF. DAYS COEFF. DAYS COEFF. BEET BEET DAYS COEFF. <br />NUMBER <br />1 1 0.100 1 0.180 1 0.120 1 0.100 1 0.14 <br />2 6 0.100 7 0.180 7 0.120 9 0.120 5 0.14 <br />3 11 0.120 14 0.200 14 0.130 17 0.130 9 0.15 <br />4 17 0.160 21 0.220 22 0.150 26 0.160 14 0.17 <br />5 22 0.210 28 0.240 29 0.200 35 0.200 18 0.19 <br />6 28 0.280 35 0.280 36 0.290 44 0.290 23 0.22 <br />7 33 0.390 42 0.340 43 0.450 52 0.450 27 0.33 <br />8 39 0.530 56 0.660 50 0.810 61 0.650 32 0.48 <br />9 44 0.750 63 0.900 58 0.990 78 1.040 36 0.71 <br />10 50 0.980 70 1.070 65 1.080 87 1.100 41 1.04 <br />11 53 1.050 80 1.150 72 1.130 97 1.150 45 1.18 <br />12 55 1.080 90 1.170 82 1.170 107 1.160 55 1.24 <br />13 60 1.100 100 1.190 92 1.170 117 1.160 65 1.21 <br />14 65 1.120 110 1.210 102 1.170 127 1.160 75 1.21 <br />15 75 1.120 120 1.190 112 1.140 137 1.150 85 1.19 <br />16 80 1.110 130 1.120 122 1.030 147 1.140 95 1.12 <br />17 85 1.100 140 0.980 125 0.918 157 1.130 105 0.98 <br />18 90 0.905 150 0.750 132 0.870 167 1.120 115 0.75 <br />18 95 0.710 160 0.500 135 0.730 177 1.100 125 0.5 <br />20 105 0.150 170 0.240 142 0.670 187 1.080 135 0.24 <br />6 <br />A 275 01.09.95 1.14-15 Al-azzawe <br />
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