4.11 - Blaney-Criddle Crop Coefficient File (*.kbc)
The crop coefficient file (*.kbc) contains Blaney-Criddle crop coefficient curves for the SCS modified
Blaney-Criddle or original Blaney-Criddle method. This file is read when flag1= 1 in the model
control file (see Section 4.4). There must be a one-to-one correspondence between crop names in the crop
characteristic file (*.cch) and Blaney-Criddle crop coefficient file. The recommended naming convention to
identify crops with their crop coefficients is Crop_Name.XXXX as described in Section 3.1.7. An example
is provided in Appendix A.
| Row-Data | Program Variable | Description |
|---|---|---|
| Row 1 | Format (a80) | |
| 1-1 | remark | Title |
| Row 2-4 | Free Format | |
| 2-1 | nc | Number of crop coefficient curves |
| 3-1 | id | Crop number (not used in StateCU) |
| 3-2 | cropn | Crop name |
| 3-3 | flag | Growth curve type; Day=perennial crop, Percent=annual crop |
| 3-4 | ktsw | Switch to use SCS modified Blaney-Criddle (ktsw=0 or no value), original Blaney-Criddle (ktsw=1), modified Blaney-Criddle with elevation adjustment (ktsw=2), original Blaney-Criddle with elevation adjustment (ktsw=3), or Pochop Method (ktsw=4) for estimating potential ET for this crop |
| 4-1 | nckcp(j) | Day of the year for perennial crop types, for crop j |
| nckca(j) | Percent of growing season for annual crop types, for crop j | |
| 4-2 | ckcp(1,j) | Corresponding crop coefficient for perennial crop types, for crop j |
| ckca(1,j) | Corresponding crop coefficient for annual crop types, for crop j |
Read 25 day/crop coefficient pairs (Row 4) for perennial crop types
Read 21 percent/crop coefficient pairs (Row 4) for annual crop types
Repeat for the number of crop coefficient curves, nc