From the ResSim main window, navigate to the Water Quality module. The module data panel allows users to select specific created water quality datasets to view in the map schematic. On the Toolbar, three are three key Water Quality Tools:

  1. Water Quality Extent and Regions tool , which is used to define the geographic extent and regional divisions of a selected Geometry Dataset (e.g., GeometryData1). The use of this tool is discussed in more detail in the section Create or Edit Regions.
  2. Mass Injection tool , which is specifically used for the mass injection dataset (refer to Chapter 11).
  3. Station Tool , which is applicable only to meteorological and/or observed datasets (refer to Chapter 3 and Chapter 7). 

Water quality geometries require an ResSim Reservoir Network (refer to Create a New Geometry. When an existing Geometry Dataset is selected to display in the map window schematic (e.g., GeometryData1), the linked reservoir network for that geometry dataset will be displayed. A geometry dataset contains a single geographic Extent (refer to Geometry Editor – Extent Tab) and one or more Regions (refer to Geometry Editor – Regions Tab).

By default, the geographic extent of newly created geometry datasets includes all of the network elements in the ResSim reservoir network. However, users can modify the default extent to include only part of the watershed (refer to Edit Geometry Extent). The Water Quality Extent and Regions tool allows users to edit this extent, which is useful when the watershed is large but the water quality model focuses on only a small portion. Furthermore, by default, newly created geometry datasets have a single region that encompasses the entire geographic extent, acting as the default region. Regions are used to group network elements in the water quality geometry that share the same WQ Parameters (refer to Chapter 6). The Water Quality Extent and Regions tool enables users to define multiple regions for different sets of WQ Parameters (refer to Create or Edit Regions).