Set land use threshold exemptions
SECTION 10: I NPUT M ODIFICATION —I NLET D ISCHARGES
Figure 10.3
The Select Inlet dialog pops up (Figure 10.4) if at least one inlet discharge was set in the watershed (see Section 5).
Figure 10.4
All subbasins containing inlets are listed.
2. To edit inlet data for a subbasin, select the number of the subbasin from the Select Inlet combo box (Figure 10.5) and click the OK button.
Figure 10.5
3. The Edit Inlet Inputs dialog box will open, displaying the data for the inlet in the selected subbasin (Figure 10.6). When the dialog initially appears, the dialog in View mode. This allows the user to view the current parameters for the selected inlet. All the controls for editing the data are not enabled (i.e., “grayed out”).
To edit the current parameters for the inlet, click the Edit Values button.
The dialog is now in Edit mode. The controls for editing the inlet become enabled (Figure 10.6). You can now make changes to any of the inlet 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 inlet will revert back to their original values.
Figure 10.6
Inlet data may be summarized in one of four formats: constant daily loadings, average annual loadings, average monthly loadings, and daily loadings. The Select Inlet Data Type combo box located at the top of the dialog box allows the user to select the data format they prefer.
a. Constant Daily Loadings. By default, this item will be selected. If the inlet loadings are to be input as constant daily loadings, verify that the “Constant” item is selected.
This option allows the user to enter the following data: average daily water loading (flow) [m3], sediment loading [tons], organic nitrogen [kg], organic phosphorus [kg], nitrate (NO3) [kg], ammonia (NH3) [kg], nitrite (NO2) [kg], mineral (soluble) phosphorus loading [kg], CBOD loading [kg], dissolved oxygen loading [kg], chlorophyll a loading [kg], soluble pesticide loading [kg], sorbed pesticide [kg], persistent bacteria, less persistent bacteria (both in [ # bacteria/100 ml]), conservative metal #1
the SWAT model (see the Soil and Water Assessment Tool User's Manual, Version 2009, Chapter 31). This data represents average daily loadings input to the stream network every day of the simulation.
To define the constant daily loadings, enter the data in the section of the dialog box labeled Constant Daily Loadings (Figure 10.7).
Figure 10.7
b. Average annual daily loadings. If the inlet loadings are to be input as average daily loadings for each year, verify that the “Annual Records”
item is selected from the Select Inlet Data Type combo box.
The Observed Loadings Input Files section in the dialog box is now enabled (Figure 10.8).
Figure 10.8
This option requires the user to summarize daily loadings by year (see the Soil and Water Assessment Tool User's Manual, Version 2009, Chapter 31). Prior to creating the project, a data table should be set up following the format specified for Annual Loadings in Section 3.3.
i. Click the open file folder button to the right of the text box.
ii. 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 10.9).
Figure 10.9
iii. Select the file and click Open.
c. Average monthly daily loadings. If the inlet loadings are to be input as average daily loadings summarized on a monthly basis, verify that the “Monthly Records” item is selected from the Select Inlet Data Type combo box.
The Observed Loadings Input Files section in the dialog box is now enabled (Figure 10.10).
Figure 10.10
This option requires the user to summarize average daily loadings by month (see the Soil and Water Assessment Tool User's Manual, Version 2009 , Chapter 31). Prior to creating the project, a data table should be set up following the format specified for Monthly Loadings in Section 3.3.
i. Click on the open file folder button to the right of the text box.
ii. 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 10.11).
Figure 10.11
iii. Select the file and click Open.
d. Daily Loadings. If the inlet loadings are to be input as average daily loadings summarized on a monthly basis, verify that the “Daily Records”
item is selected from the Select Inlet Data Type combo box.
The Daily Loadings section of the dialog box is now enabled (Figure 10.12).
Figure 10.12
This option requires the user to summarize loadings by day (see the Soil and Water Assessment Tool User's Manual, Version 2009, Chapter 31). Prior to creating the project, a data table should be set up following the format specified for Daily Loadings in Section 3.3.
i. Click on the open file folder button to the right of the text box.
ii. 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 10.13).
Figure 10.13
iii. Select the file and click Open.
4. When you have finished inputting your inlet parameters, click the Save Edits button. This will write the edits to the “ppi” table in the SWAT Project Geodatabase. A message box will appear (Figure 10.14).
Figure 10.14
5. Click the Exit button in the Edit Point Discharges Input dialog box to return to the Select Inlet dialog (Figure 10.15).
Figure 10.15
6. Click the Cancel button on the Select Inlet dialog to return the ArcSWAT project, or choose a new inlet to edit.