DRBC develops and applies various near-field and far-field models for basin waters. Examples of models created and utilized by DRBC staff 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; and
  • No Measurable Change (NMC) evaluations for dischargers in Special Protection Waters (models developed for the following subwatersheds: Neversink, Brodhead, Lehigh, and Lower Delaware)

DRBC utilizes its DRB-PST Model for flow management to study salinity intrusion and support decree party negotiations.

DRBC also runs a daily flow and transport model, which can be useful in emergency response (e.g. a spill). 

For water supply planning, DRBC is developing a hydrologic watershed model to evaluate water stressors such as growth of population centers, the effects of land-use change, water use, and the effects of climate variability and climate change on water resources in the basin.

In the Delaware Estuary, under the guidance of the Eutrophication Model Expert Panel, DRBC is developing an eutrophication model to develop feasible scenarios of controlling nutrients loads into Delaware River Estuary and Bay in order to achieve higher dissolved oxygen concentrations. Completion and calibration of this model will ultimately allow assessment of the attainability of wasteload allocations that will support the adoption of revised designated uses and associated dissolved oxygen criteria, and nutrient criteria, if needed.

Delaware Estuary Modeling Documents