# 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-Data Program Variable Description
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)
2-1 tyr Year
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)
3-1 cropn Crop name
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 nyr1 and nyr2 (see Section 4.4).