4.12 - Crop Distribution File (*.cds)
The crop distribution file (*.cds) contains total acreage and associated crop acreage for structures.
The file can contain more structures than defined by the structure location (*.str) file, but must include
all structures being simulated. This file is read for monthly and daily ET methods. The recommended naming
convention to identify crops with their crop coefficients is
Crop_Name.XXXX as described in Section 3.1.7.
Crop names in the *.cds file must correspond to an identical crop name in the crop coefficient (*.kbc or *.kpm)
and crop characteristic file (*.cch). Note that because of formatting constraints, total acreage must be less
than 10 digits. An example is provided in Appendix A.
|Row 1||Format (6x, i4, 11x, i4, 7x, a3)|
|1-1||gnyr1||Beginning year of crop data|
|1-2||gnyr2||Ending year of crop data|
|1-3||idum3||CYR for calendar year|
|Row 2||Format (i4, 1x, a12, 18x, f10.0, i10)|
|2-2||tid||Irrigation structure ID|
|2-3||ttacre||Total acreage served by structure in specified year|
|2-4||tncrop||Number of crop types for this year and structure ID|
|Row 3||Format (5x, a30, f10.3, f10.3)|
|3-2||tpct(1)||Decimal fraction of total acreage planted with specified crop (no longer used by StateCU)|
|3-3||cacre(1)||Total acreage planted with specified crop|
Repeat for all crop types, decimal fractions must add up to 1.0.
Repeat for the number of structures – can be more structures than defined by structure location (*.str) file, but must include all structures of interest.
Repeat for each year of data – total years can be more than study period defined in the model control file by
nyr2 (see Section 4.4).