Document Type

Technical Report

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Pend Oreille River -- Idaho -- Water quality -- Models, Water-supply -- Models, Pend Oreille River -- Idaho -- Water quality -- Computer simulation, Hydrologic models, Hydrodynamics -- Mathematical models


The objectives of this project were to:

• Develop a hydrodynamic and temperature model of Pend Oreille River using CE-QUAL-W2 Version 3.2

• Calibrate the CE-QUAL-W2 model to field data collected during 2004 and 2005 using the following water quality variables:

  • flow, water surface elevation, and velocity
  • temperature o dissolved oxygen
  • nutrients (NO3-N+NO2-N, NH4-N, PO4-P)
  • algae – chlorophyll a
  • BOD5 and dissolved organic matter and particulate organic matter compartments (both labile and refractory) for the organic matter cycling with algae
  • periphyton

The model chosen for development was CE-QUAL-W2 Version 3.2 (Cole and Wells, 2004). This is a two-dimensional unsteady hydrodynamic and water quality model that includes typical eutrophication constituents (algae, nutrients, temperature, organic matter, dissolved oxygen, pH). Portland State University’s Water Quality Research Group is a center for development of this modeling tool (see

The model simulation was run from January 1st, 2004 to September 25th, 2005. The calibration period focused on the summers during each year when water quality data were obtained.


Technical Report EWR-02-06 produced by the Water Quality Research Group, Department of Civil and Environmental Engineering, Maseeh College of Engineering and Computer Science, Portland State University, for Idaho Department of Environmental Quality.

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