4.13 - Historical Direct Diversion File (*.ddh)

The historical direct diversion file (*.ddh), provides historic monthly diversions for a list of structures. For the base datasets, it is the same file used by the Water Resources Planning Model, StateMod, which contains actual diversions for explicitly and aggregated modeled structures. Water supply contained in the historical direct diversion file (*.ddh) represents river headgate diversions, not the supply delivered to the crop. StateCU uses the ditch and application efficiencies read in the irrigation parameter yearly data (*.ipy) file to estimate the water available to the crop. Missing data is accepted using a –999 placeholder. The file can contain more structures than defined by the structure location file (*.str). If structures defined in the structure location file (*.str) are not included in the historical direct diversion file, for instance because they are irrigated only with ground water, StateCU sets historical direct diversions to ‘0’. The total years can be more than the study defined in the model control file by nyr1 and nyr2 (see Section 4.4). The data can be in calendar year or water year. This file is only read if a water supply option is defined in the model control file (isuply> 0). 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 diversion data
1-2 gnyr2 Ending year of diversion data
1-3 idum3 CYR for calendar year or WYR for water year
Row 2 Format (i4, 1x, a12, 12(f8.2))
2-1 tyr Year
2-2 tid Structure ID
2-3 divsup(1,tyr,1-12) Diversions for months 1-12 (acre-feet)

Repeat for the number of diversion structures.

Repeat for each year gnyr1 through gnyr2.