Development of a Water Quality Model of the Sammamish River
A laterally-averaged, vertically 2-dimensional water quality model of the Sammamish River was developed
using the CE-QUAL-W2 (Version 3.2) model developed by the U.S. Army Corps of Engineers Waterways
Experiment Station (ACOE-WES). The model was developed to allow for simulation of the effectiveness of
possible future river restoration scenarios, including but not limited to riparian restoration and
increased groundwater inflow. These restoration approaches have been considered due to the high water
temperatures routinely observed during summer low-flow conditions in the river.
The development (including minor code modifications), calibration, and testing of the Sammamish River model
is described in this report. The current version of the model is most capable of simulating water
temperatures, except in the lower portion of the river influenced by the backwater from Lake Washington
based on comparison to temperature data collected between 1998 and 2003. Primarily due to the difficulty
of capturing the dynamics of aquatic plant growth in the river, the model does not perform as well for
other water quality constituents of interest – particularly dissolved oxygen.
Download the Report
This report is provided in Adobe PDF format.
You will need Adobe Acrobat to view the document. For help using Acrobat files, please visit our
Acrobat© help page.
Download the Sammamish River Water Quality Modeling Report