Differences_REV445_and_REV481

Sep 17, 2026

Differences document comparing software model revisions REVISION 445 through REVISION 481, detailing changes to input and output behavior across multiple files. It adds new HRU output variables for soil carbon, introduces flags to control large output files and snow band outputs, updates HRU and SOL printing logic, and documents changes to FILE.CIO, HOURQ.OUT, and CSWAT profile text output. It also records revision notes from 462–471 on phosphorus handling, unit changes, irrigation source variables, autocalibration fixes, septic interface updates, and related code corrections.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages6

Reading Time15 min

AccessFree to download

Differences since REVISION 445 and REVISION 461

OUTPUT.HRU and carbon-related inputs/outputs

CHANVEL.OUT and WATRDEP.OUT controls and outputs

SNOWBAND.OUT and .sub climate/snow filename input

FILE.CIO changes and HOURQ.OUT output restructuring

CSWAT_PROFILE.TXT and atom.atm updates

REVISION 462 - 471 change notes

Phosphorus, unit changes, irrigation source variables

Autocalibration fixes and input type corrections

Septic notes, interface parameters, and daily NaN fix

Septic output/input handling

Phosphorus (EPA) parameters and urb_bmp subroutine

Differences since REVISION 445 and REVISION 461 1) OUTPUT.HRU – added output variables to the daily, monthly, annual files: CMUP_KGH – current soil carbon for first soil layer (kg/ha) CMTOT_KGH – current soil carbon integrated – aggregating all soil layers (kg/ha) REFERENCE: ch32_output.doc 2) CHANVEL.OUT/WATRDEP.OUT – These output files existed in previous versions, but was taken out because of large files being written. It will only be written for a DAILY print code. A flag was added to file.cio to turn off/on BOTH files. Default is 0 (no file written) . The CHANVEL.OUT file writes Day, Year, and daily streamflow velocities (m/s) for each channel in the subbasin. WATRDEP.OUT writes day, year, and average water depth (m) . Jeff mentioned combining these files, but at this point it is still being written as two files. REFERENCE: ch32_output.doc 3) CARBON – added inputs to the bottom of the .HRU file: CF – this dimensionless parameter controls the response of decomposition to the combined effect of soil temperature and moisture. (Range 0.5 – 1.0) CFH – will be determined whether users will be allowed to change this variable CFDEC – Undistrurbed soil turnover rate under optimum soil water and temperature. Increasing this variable will increase carbon and organic N concentration.(Range 0.50 – 1.0) REFERENCE: ch19_input_hru.doc (chapter being updated now) 4) output.hru – HOPEFULLY, the changes for printing HRU’s greater than 9999 isentact for daily, monthly, yearly and annually. This has not been tested to my satisfaction, but the code is there. 5) SNOWBAND.OUT – New output file that prints snow water content in elevation band on current day (mm/H2O) . A flag has been added to turn this file off/on named “ISNOW” read in from file.cio. Default for ISNOW is 0. REFERENCE: ch32_output.doc 6) Added new input variable in .sub file for input snofile name. Line \#35 of the .sub file currently reads “Climate Change”. This is where we put the snow output filename, if applicable. (see attached 000180000.sub example file) . REFERENCE: ch05_input.sub.doc 7) OUTPUT.SOL – Mike Winchell made changes (see email 11/30/2010 – subject: Printing of output.sol REFERENCE: ch32_output.doc 8) FILE.CIO – Took out the variable named “IPRS”. Changed to ‘titldum’. This input originally being read in right after “IPRP”. It was not being used anywhere in the code. 9) 10) HOURQ.OUT file – changes to this output file. This file will be written only if IPHR (file.cio) = 1: Previous file: TOTAL SURFACE WATER YLD RUNOFF YEAR DAY HOUR SUB (m**3) (m**3) New file: TOTAL WATER YLD YEAR DAY HOUR HYD (m**3) REFERENCE: ch32_output.doc 11) output file CSWAT_PROFILE.TXT – Carbon output daily file (CSWAT in .bsn file should be = 1 for file to print) IYR = current year of simulation I = current day of simulation J = HRU number CMASS_PRO – Mass of soils carbon in the soil organic matter in the entire profile or sum ofall layers (no residue; no manure) (kg/ha) SOL_RSD_PRO – Sum for all layers of the soil residue (kg/ha) SOL_MC_PRO – Sum for all the layers of the manure carbon (kg/ha) REFERENCE: ch32_output.doc (Liz is working on adding) & cswat_profile.txt file 12) atom.atm file updated. Previous file MAY have been formatted wrong. REFERENCE: atom.atm REVISION 462 Added input variable to .chm file for phosphorus in the sub-soil changes: PHOSKD_SUB-Look at revision 476 for further info on this variable. REVISION 463 Changed units printed for CHOLA(mic/L), CBODU(mg/L) and DOXQ(mg/L)(output.sub-originally listed as kg/ha) Irrigation source by each application code added to case(2 – irrigation operation) and case(10 – auto irrigation) in .mgt file. New variable names: case (2) IRR_SC – Irrigation source code IRR_NO – irrigation source location case (10) IRR_SCA – auto irrigation source code IRR_NOA – auto irrigation source location REFERENCE: ch20_input_mgt.doc REVISION 464 Auto calibration

FAQs

What new output variables were added in OUTPUT.HRU for daily, monthly, annual files?

Two soil-carbon variables were added: CMUP_KGH for current soil carbon in the first soil layer, and CMTOT_KGH for current soil carbon integrated across all soil layers.

How are CHANVEL.OUT and WATRDEP.OUT controlled in newer versions?

They were removed due to large file sizes and are only written for a DAILY print code. A flag was added to file.cio to toggle both files, and defaults to 0 meaning no file is written.

What is the purpose of SNOWBAND.OUT and how is it enabled?

SNOWBAND.OUT prints snow water content in an elevation band for the current day. It is controlled by an ISNOW flag read from file.cio, with default ISNOW set to 0.

Sep 17, 2026

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