DSM2 Users Group

January 24, 2006


New DSM2 Development

      Last major item is connecting PTM to new DSM2 model

      Many Clifton Court and permanent South Delta gate studies have been done, as well as 82 year run

      Release waiting testing by DMS


Standardization of DSM2 Studies

Input Data

From discussions in email and meetings we have agreed that the CBDA-BDPAC Common Assumptions Work Team effort will largely satisfy DSM2 Input Data standards.


Some discussion has occurred with interested members of the Users Group, detailed implementation of this item will wait until the new version of DSM2 is more widely distributed.

Scripts and Conversions

Little progress made; we expect to finish this in February.

Output Locations and Analyses

A tentative list of standard output locations and types of data was developed by interacting with interested users; these will be stored in the new DSM2 Output Time Series, and refined when use of the new version is more widespread.


Little work on analyses; this will probably be put off until the new version is more widely used.

Input Variation/Time Scales

A preliminary analysis done by comparing the historical-data run with monthly-averaged historical data shows that in some locations at some times the monthly averages lose desirable detail, but at other times monthly averaging is not important. The next test will be to compare a CALSIM monthly timestep run with a CALSIM daily timestep run using the new version of DSM2. This should reveal greater differences, since while the two CALSIM runs use the same input boundary hydrology their intra-monthly operations are somewhat different; and with active operating rules in DSM2, daily variations in flows will be more important than with the text version of DSM2.


DSM2 (new version) has run over the full 82 years of CALSIM (see below). While the extended time period has a specific use involving the Enlarged Los Vaqueros studies, it can also be used to see how 16-year studies compare to 82-year studies.

BDAT Improvement

Not strictly a DSM2 standard, but we have started working with Karl Jacobs, developer and maintainer of the Bay-Delta and Tributaries (BDAT) database, to make changes to the interface and data so as to be more useful to the modeling community. Please send suggestions to Ralph Finch.


DSM2 73-yr 82-yr Extension

      Runs from WY 1922 through 2003 in about 20-25 hours on a Condor pool of 15 Windows XP machines, using new DSM2 version.

      DICU 2020 extended through period thanks to Jim Wilde and Tariq Kadir

      Martinez stage extended through period and now have two modes:

o       Pure astronomical

o       Adjusted astronomical with Golden Gate stage

Not identical to 16-year adj-astro because of different calibration coefficients

      Kyle Winslow of CH2M compared pure astro and 16-year adj-astro in DSM2, found only minor differences

      New DSM2 version operates South Delta permanent gates and Montezuma Slough Salinity Control Structure in model realtime, but current DSM2 still needs to have Montezuma Slough seasonal operation generated before run.

      DMS is investigating the usefulness of Priority 3 Clifton Court Forebay gate operation, which may be difficult to extend. Priority 4 operation may be suitable.