DWR_2807910 - Laserfiche WebLink

MEMORANDUM December 13, 2013 Issues with Selecting an Appropriate Crop Growth Stage Coefficient for the SCS Mod. Blaney Page 16 of 34 The data from ARS 1275 do not show any it is probable that other data were considered in the development of SCS TR Figure 15 - kc vs. month for winter wheat Small Grain. The SCS TR-21 coefficients for small grain were compared to two data set The data sets from ARS 1275 represent elevation of 3,091 feet above sea level. The data from ARS 1275 did not show a strong relationship (R 0.857), as shown in Chart 12, to TR this data in part, or not at all. Figure 16 - kc vs. month for B Orchards. The SCS TR-21 coefficients for orchards were compared to ten data sets in ARS 1275. The data sets from ARS 1275 represent “Deciduous Fruit,” lemons, grapefruit, orange, and walnut trees. TR 21 provided two curves for orchards, one with “ground cover” and mention of what type of ground cover, whether it is grass, alfalfa, or another common. Similarly, the ARS 1275 is not clear on what was meant by “deciduous fruit.” 1275 were reported from the following locations: 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0 2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 3 4 Issues with Selecting an Appropriate Crop Growth Stage Coefficient for the SCS Mod. Blaney-Criddle Eqn. not show any correlation to TR-21, as shown in Chart 11, other data were considered in the development of SCS TR-21 coefficients. vs. month for winter wheat 21 coefficients for small grain were compared to two data set represent barley in Mandan, ND and Logan, UT reflect an feet above sea level. The data from ARS 1275 did not show a strong relationship (R to TR-21 and may suggest that the TR-21 coefficients could have relied on vs. month for Barley 21 coefficients for orchards were compared to ten data sets in ARS 1275. The data sets from ARS 1275 represent “Deciduous Fruit,” lemons, grapefruit, orange, and walnut trees. TR 21 provided two curves for orchards, one with “ground cover” and one without. The SCS provides no mention of what type of ground cover, whether it is grass, alfalfa, or another legume Similarly, the ARS 1275 is not clear on what was meant by “deciduous fruit.” ed from the following locations: 4 6 8 10 Phoenix Garden City Bushland Average SCS TR-21, Wheat 5 6 7 8 Mandan, ND Logan, UT Average of ARS 1275 SCS TR-21, small grains Criddle Eqn. , and suggests that 21 coefficients. 21 coefficients for small grain were compared to two data sets in ARS 1275. reflect an average feet above sea level. The data from ARS 1275 did not show a strong relationship (R2 = 21 coefficients could have relied on 21 coefficients for orchards were compared to ten data sets in ARS 1275. The data sets from ARS 1275 represent “Deciduous Fruit,” lemons, grapefruit, orange, and walnut trees. TR- one without. The SCS provides no legume; all of which are Similarly, the ARS 1275 is not clear on what was meant by “deciduous fruit.” Data from ARS 12 9