Background Material and References
DSM2 Hydro is based on the FourPt computer program written by Lew DeLong in USGS. The original documentation for FourPt is available here. DSM2 adds improvements and enhancements to the FourPt model, including an improved input and output system.
DSM2 Qual is roughly based on QUAL-2E and the Branched Langrangian Transport Model (BLTM) written by Harvey Jacobson of USGS.
Download DSM2 Versions
DSM2 has had many versions over the past 30 years. Some of the recent ones are available here
References:
QUAL2E
Documentation - Basis for QUAL Nonconservative Constituent
Kinetics.pdf
D1641rev.pdf
EC_chloride_bromide_05_29_01.pdf
Delta
D1641 Water Quality Standards Full
Reference.pdf
BLTMenhancements-USGSWRI97_4050.pdf
Four
Point memo from USGS-basis for DSM2
HYDRO.pdf