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Instream Flow Demand - Monthly (*.ifm)

The monthly instream flow demand file contains instream flow demands for each month of the simulation period. Data should be entered in the order of the structure file (*.ifs). To allow StateMod to be backward compatible with old data sets, this file is required only when monthly data is required (e.g. when the instream flow station (*.ifs) file variable iifcom is set to 1).

Note negative monthly demands are estimated to be a forecast which is currently only used by the Rio Grande compact simulations (see operation rule types 17 and 18). Also for use by the Rio Grande compact the variable rspilx may be used to specify the month when a spill occurred and the prorated portion of the spill attributed to Colorado. Data should be entered by year with stations in any order. This file is read by subroutine MDAINP.

Row-data Variable Description
Control Data
1 Format (i5,1x,i4,5x,i5,1x,i4,a5,a5)
1-1 ibm Beginning month of data (e.g. 1 = Jan)
1-2 iby Beginning year of data (e.g. 1975)
1-3 iem Ending month of data
1-4 iey Ending year of data
1-5 cunit Units of data ('ACFT' or 'CFS')
1-6 cyr Year type
'CYR' = calendar year (1-12)
'WYR' = water year (10-9)
'IYR' = irrigation year (11-12)
Time Series Data
2 Format (i4, 1x, a12, 12f8.0, 10x, f8.2)
2-1 idyr Year
2-2 cistat Demand station ID
2-3 diverm(1-12,1) Demands (AF) for months 1-12. A negative number is treated as a forecast.

Repeat for the number of instream flow stations

Repeat for each year of the simulation

Note rspilx is only used by the Rio Grande operating rules (types 17 and 18).