CRDSS_Task1_14-15_Penman-Monteith Equation

• 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.

Table 4 shows the Grass base mean crops coefficients and Kcm values (MEAN_GRASS) from Jensen et al.
(1990) modified for the CRDSS.
TABLE 4
GRASS BASE MEAN CROPS COEFFICIENTS AND Kcm VALUES
CROP ORCHARD SUGAR SMALL
TYPE WITH COVER BEETS CORN BEANS GRAIN GRAPES COTTON VEGETABLE GRASS
DAYS TO FULL 66 87 72 55 70 30 80 45 110
COVERS
SERIES DAYS COEFF. DAYS COEFF. DAYS COEFF. DAYS COEFF. DAYS COEFF. DAYS COEFF. DAYS COEFF. DAYS COEFF. DAYS COEFF.
NUMBER
1 1 0.960 1 0.160 1 0.190 1 0.140 1 0.460 1 0.140 1 0.170 1 0.320 1 0.600
2 15 1.010 15 0.220 7 0.190 5 0.140 7 0.460 15 0.210 15 0.210 15 0.320 10 0.650
3 30 1.060 30 0.330 15 0.240 10 0.140 15 0.670 30 0.500 30 0.290 30 0.340 20 0.700
4 45 1.100 45 0.530 22 0.330 15 0.400 22 0.800 45 0.640 45 0.590 45 0.400 30 0.780
5 60 1.140 52 0.735 30 0.440 18 0.550 30 0.950 60 0.740 60 0.940 60 0.550 40 0.780
6 75 1.170 60 0.970 35 0.540 23 0.795 35 1.020 75 0.820 75 1.230 75 0.850 50 0.780
7 90 1.190 67 1.050 40 0.630 27 1.000 40 1.085 90 0.850 82 1.24 82 0.95 60 0.780
8 105 1.210 75 1.140 45 0.720 30 1.140 45 1.150 105 0.850 90 1.250 90 1.060 70 0.780
9 120 1.210 82 1.160 53 0.920 33 1.140 50 1.160 112 0.85 97 1.25 97 1.1 80 0.780
10 135 1.220 90 1.170 60 1.150 37 1.140 55 1.170 120 0.830 105 1.250 105 1.13 90 0.780
11 143 1.210 97 1.170 67 1.167 41 1.140 60 1.180 127 0.83 112 1.235 112 1.14 100 0.780
12 150 1.210 105 1.180 75 1.180 45 1.140 67 1.190 135 0.830 120 1.220 120 1.150 110 0.780
13 159 1.210 112 1.180 83 1.180 49 1.120 75 1.200 142 0.81 127 1.18 127 1.14 120 0.780
14 165 1.190 120 1.170 90 1.180 55 1.050 82 1.175 150 0.780 135 1.080 135 1.13 130 0.780
15 173 1.190 127 1.170 97 1.165 58 1.030 105 1.100 157 0.730 142 0.950 142 1.090 140 0.780
16 180 1.180 135 1.170 105 1.130 60 1.010 112 0.945 165 0.670 150 0.810 150 1.040 150 0.780
17 187 1.170 142 1.155 112 1.030 64 0.870 120 0.810 172 0.600 157 0.680 157 0.980 160 0.780
18 195 1.160 150 1.140 120 0.910 68 0.750 125 0.700 180 0.520 165 0.540 165 0.91 165 0.780
18 210 1.150 157 1.100 127 0.760 73 0.590 130 0.580 187 0.400 172 0.430 172 0.830 170 0.780
20 225 1.110 165 1.060 135 0.590 75 0.520 135 0.470 195 0.270 180 0.300 180 0.740 180 0.760
8
A 275 01.09.95 1.14-15 Al-azzawe