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Water Quality Stations – Station Editor
Through the Station Editor (figure below), the water quality (WQ) station can be configured as a Met Station, an Observed Station, or both. Important: It is recommended that users not modify the station configuration (i.e., Met Station, an Observed Station, or both) from the Station Editor, from the Watershed Setup module, once the WQ station has been assigned to a Meteorological and/or Observed Dataset (as described in Chapter 3 and Chapter 7, respectively) in the Water Quality module.
The following is the list of fields in the Station Editor (figure above):
Stream Name | Displays the name of the stream alignment if the station is connected to a stream. This field cannot be edited from this editor. |
Label Position | Allows the user to select the location of the station's label in the map schematic relative to the location of the stations' icon. Select the label position from the list (e.g., east, northeast, southeast, etc.). |
Stream Station | If the station is connected to a stream, the stream station (or river station) is set automatically by HEC-ResSim according to the linear distance between river nodes on the stream element in the watershed coordinate system. Note: Stationing increases upstream along the element. |
Reference Elevation | This is a user-defined value that should correspond to an average land surface elevation at the station's location. Units (feet or meters) are displayed based on the watershed units of measure and the watershed display units. |
Latitude | This is a user-defined value for the latitude. Units are listed in fractional degrees. By default, the value is 0.0 fractional degrees. |
Longitude | This is a user-defined value for the longitude. Units are listed in fractional degrees. By default, the value is 0.0 fractional degrees. |
Nearest Standard Meridian | This is the nearest corresponding time zone for the station. By default, the selection is Greenwich mean time. It is important that the selected time zone be the time zone in which all other time series (including flow and constituent boundary conditions) have been entered. |
Location ID | This represents the internal Location ID that HEC-ResSim gives the Station to distinguish it from others. |
Observed Station | This option allows users to set the water quality station as an observed station, by checking the checkbox. Stations that are set as observed stations can be assigned Observed Data from the Water Quality module when Observed Datasets are defined (refer to Chapter 7). |
Met Station | This option allows users to set the water quality station as a meteorological (Met) station by checking the checkbox. Stations that are set as Met stations can be assigned Meteorological Data from the Water Quality module when Met Datasets are defined (refer to Chapter 3). |
Snap to Stream Element | This element connects the water quality station to the nearest stream element. |
To open the Station Editor (figure above) and define the configuration of a station:
- From the HEC-ResSim main window (prior figure), from the Watershed Setup module, from the Toolbar, select the Station Tool
(prior figure).
- From the map schematic display area (prior figure), select a station in the map schematic (highlights the station in yellow), right-click the selected station (figure below). From the shortcut menu, click Edit Station (figure below) and the Station Editor (figure above) opens.
- The Station Editor (figure above) automatically opens to the selected station. The name of the selected station displays in the Name (figure above) dropdown list and cannot be modified from the Station Editor; however, the name can be modified from the Rename Station dialog (Figure 2.14). Note: Users can navigate between created water quality stations by using the Navigation Bar in the top right (see Section 2.6.1 for more information).
To configure the station as a Met Station, an Observed Station, or both, click the corresponding checkbox located near the bottom of the Station Editor (figure above).
Complete the station configuration by entering relevant elevation, latitude, longitude and standard meridian information.
Figure 2.11-Map Schematic – Station Shortcut Menu- When a station is added to the map schematic within a standard tolerance distance from a stream element, then by default, the station is snapped to the nearest stream element. To unsnap the station, uncheck the Snap to Stream Element (figure above).
- Stations not snapped to a stream element have empty and disabled Stream Name and Stream Station fields (figure above).
- When the Station Editor is complete, click OK to close the editor and save the entered configuration for the selected station. Alternatively, click Apply to save the information for the currently selected station and select another station to edit from the Navigation Bar in the top right (see Section 2.6.1 for more information). Click Cancel to close the editor without saving unapplied changes (Cancel will not remove changes already saved using the Apply button).
Station Configuration – Met and/or Observed Water Quality
Note: The assignment of the station configuration (as one or both station types) is important and should not be modified once the WQ station has been assigned to a Meteorological and/or Observed water quality Dataset (described in Chapter 3 and Chapter 7, respectively) in the Water Quality module.
Reference Elevation
A time series of atmospheric pressure is preferred, but if none is available, the local atmospheric pressure can be estimated from the reference elevation. If the station is a Met station that is being used to estimate atmospheric pressure for input in a water temperature model, then the entered reference elevation should correspond to an average land surface elevation.
Latitude, Longitude and Standard Meridian
Latitude, longitude and standard meridian are required if a solar radiation time series is computed.
If the station represents a weather station (Met station) located close to the river, the longitude and latitude entered here should be that of the location of the weather station. If the weather station is remote, or if weather data is compiled from multiple sources, choose a central longitude and latitude.
The nearest standard meridian is the location corresponding to the local time zone. It is important that the set standard meridian be the same time zone as the water quality time series data linked to the WQ station. Please see instructions on linking water quality time series data to WQ stations.