Set land use threshold exemptions
SECTION 11: I NPUT M ODIFICATION —R ESERVOIRS
Figure 11.3
All subbasins containing reservoirs will be listed.
2. To edit inlet data for a reservoir, select the number of the subbasin from the Select Reservoir combo box (Figure 11.4) and click the OK button.
NOTE: The number selected refers to the subbasin ID of where the reservoir is located, NOT the RES_NUM of the reservoir found in the fig.fig file.
Figure 11.4
3. The Edit Reservoir Parameters dialog box will open, displaying the data for the reservoir in the selected subbasin (Figure 11.5). The Reservoir data dialog box allows the user to enter/edit reservoir parameters related to the water, sediment, nutrient and pesticide processes occurring in the reservoir. The dialog has three tabs: Reservoir Data, Monthly Data, and Lake Water Quality Data. When the dialog initially appears, the dialog in View mode. This allows the user to view the current parameters for the selected reservoir. All the controls for editing the data are not enabled (i.e., “grayed out”). To edit the current parameters for the reservoir, click the Edit Values button. The dialog is now in Edit mode.
The controls for editing the reservoir become enabled (Figure 11.6). You can now make changes to any of the reservoir parameters in the dialog.
Your edits will not be saved to the SWAT Project Geodatabase until you click the Save Edits button. If you decide not to save the edits you have made, click the Cancel Edits button, and the parameters for your reservoir will revert back to their original values.
Figure 11.5
a. Reservoir Data. The variable names listed in the Reservoir Data tab control the physical characteristics and management of the reservoir.
There variables are defined in the Soil and Water Assessment Tool User's Manual, Version 2009, Chapter 29.
Note: If the cursor is placed on top of any text box or button, a short help description
“tooltip”) appears and the range of variation for parameter is shown.
To edit a parameter, activate the text box adjacent to the variable name by clicking on it. Enter and/or edit the text value.
If the value for the parameter entered is out of range a message box like the one in Figure 11.6 appears.
Figure 11.6
Click OK. The parameter is reset to the previous value.
If the user selects Measured monthly outflow or Measured daily outflow as the outflow option (IRESCO), predefined formatted tables must be used to input the outflow data.
i. Daily Reservoir Outflow data. If Measured daily outflow is selected from the IRESCO drop-down list (Figure 11.7), the user is required to create a data table containing the daily outflow information for the reservoir following the format specified for Reservoir Daily Outflow in Section 3.3.
Figure 11.7
The text box labeled “RESDYAO Table” is enabled (Figure 11.8).
Figure 11.8
Click the open file folder button. A browser will be displayed, allowing the user to select the dBASE file (.dbf) or text file (.txt) containing the inlet data from disk (Figure 11.9).
Figure 11.9
Select the file and click Open.
ii. Monthly Reservoir Outflow data. If Measured monthly outflow is selected from the IRESCO drop-down list (Figure 11.10), the user is required to create a data table containing the monthly outflow information for the reservoir following the format specified for Reservoir Monthly Outflow in Section 3.3.
Figure 11.10
The text box labeled “RESMONO Table” is enabled (Figure 11.11).
Figure 11.11
Click the open file folder button. A browser will be displayed, allowing the user to select the dBASE file (.dbf) or text file (.txt) containing the inlet data from disk (Figure 11.12).
Figure 11.12
Select the file and click Open.
b. Monthly Data: The variable names listed in the Monthly Data tab (Figure 11.13) control the constant monthly parameters of the reservoir.
There variables are defined in the Soil and Water Assessment Tool User's Manual, Version 2009, Chapter 29.
Figure 11.13
The monthly parameter of interest may be changed by selecting different values from the Monthly Parameter combo box (Figure 11.14).
Figure 11.14
New monthly values for the selected parameter are entered into the individual monthly text boxes (Jan, Feb, Mar, etc.)
c. Lake Water Quality Data. The variable names listed in the Lake Water Quality Data tab (Figure 11.15) control the water quality parameters of the reservoir. There variables are defined in the Soil and Water Assessment Tool User's Manual, Version 2009, Chapter 30.
Figure 11.15
Note: If the cursor is placed on top of any text box or button, a short help description (yellow label) appears and the range of variation for parameters is shown.
To edit a parameter, activate the text box adjacent to the variable name by clicking on it. Enter and/or edit the text value.
If the current value of the parameter is out of range a message box like the one in Figure 11.16 appears.
Figure 11.16
Click OK. The parameter is reset to the previous value.
Note: To modify the default ranges for valid parameter values, edit the resrng table in the SWAT Parameters geodatabase (SWAT2009.mdb).
4. When you have finished inputting your reservoir parameters, click the Save Edits button. This will write the edits to the “res” table in the SWAT Project Geodatabase. A message box will appear (Figure 11.17).
Figure 11.17
5. Click the Exit button in the Edit Reservoir Parameters dialog box to return to the Select Reservoir dialog (Figure 11.18).
Figure 11.18
6. Click the Cancel button on the Select Reservoir dialog to return the ArcSWAT project, or choose a new reservoir to edit.