DRBC develops and applies various near-field and far-field models for basin waters. Key outputs from applications of models include the following:

• Acute mixing zone/dilution factor determinations;
• Heat dissipation area determinations;
• TDS mixing zone determinations;
• Assimilative capacity determinations for a water quality parameter of concern;
• TMDL development to support basin states and U.S. EPA; or 
• No Measurable Change (NMC) evaluations for dischargers in Special Protection Waters 

• Water Quality Model for Carbon and PCB Homologs for Zones 2-6 of the Delaware River Estuary (pdf 7 MB; May 2011)
• PCB TMDL for DRBC Zone 6 (Delaware Bay) Established (U.S. EPA web site - pdf 1 MB; Dec. 2006)
  • TMDL for PCBs for the Delaware Bay: DRBC Zone 6 (pdf 599 KB; presentation given by DRBC staff at Sept. 26, 2006 public meeting in Dover, Del.)
• Revised Calibration of the Water Quality Model for the Delaware Estuary for Penta-PCBs and Carbon (pdf 5.5 MB; Sept. 2006)
• PCB TMDLs for DRBC Zones 2-5 Established (U.S. EPA web site; Dec. 2003)
  • DRBC Final Report: TMDLs for PCBs For Zones 2-5 of the Tidal Delaware River (pdf 1.8 MB)
  • DRBC DYNHYD5 Hydrodynamic Model (Version 2.0) and Chloride Water Quality Model for the Delaware Estuary (pdf 7.1 MB)
  • DRBC PCB Water Quality Model for the Delaware Estuary (pdf 387 KB)
• Executive Summary to the Public Hearing Response Document on the Proposed Determination Regarding the Assimilative Capacity of the Tidal Delaware River for Volatile Organics and Toxicity (pdf 105 KB; 2000)
• Wasteload Allocations for Volatile Organics and Toxicity: Phase I TMDLs for Toxic Pollutants in the Delaware River Estuary (pdf 4.56 MB; 1998)
• Implementation Policies and Procedures: Phase I TMDLs for Toxic Pollutants in the Delaware River Estuary (pdf 9 MB; 1995)