Catchment-SWMM Extended Data
Catchment-SWMM Extended Data Attributes
| Attribute | Description |
|---|---|
| Curb Length | The length of curb on the catchment. This is used to normalize water quality calculations. |
| Land Uses | Collection of Land Uses applied to the catchment for use during Water Quality calculations. Clicking the Ellipses (...) button opens the Land Uses Collection dialog box, where you can add land use entries to the collection. This field is available when you select EPA-SWMM Runoff as the Runoff Method. See Land Uses Dialog Box. |
| Initial Buildup Collection | Lets you specify the initial quantities of pollutant buildup over the catchment in a collection. Clicking the Ellipses (...) button opens the Initial Buildup Collection dialog box, where you can add initial buildup entries to the collection. This field is available when you select EPA-SWMM Runoff as the Runoff Method. See Initial Buildup Collection Dialog Box. |
| Apply Groundwater | Lets you apply groundwater to the catchment. If you select True , several additional fields become available. |
| Aquifer | Select the aquifer to apply to the catchment or select Edit... from the drop-down menu and click the Ellipses (...) button to define new aquifers in the SWMM Aquifers dialog box. See Aquifers Dialog Box. |
| Surface Elevation | The elevation of ground surface for the subcatchment that sits above the aquifer. |
| Groundwater Flow Coefficient | The groundwater flow formula is described as: where Q gw = groundwater flow (cfs per acre or cms per hectare) H gw = elevation of groundwater table (ft or m) H sw = elevation of surface water at receiving node (ft or m) E = elevation of node invert (ft or m) The groundwater flow coefficient is the value of A1 in the groundwater flow formula. |
| Groundwater Flow Exponent | The value of B1 in the groundwater flow formula. |
| Surf. Water Flow Coefficient | Value of A2 in the groundwater flow formula. |
| Surf. Water Flow Exponent | Value of B2 in the groundwater flow formula. |
| Surface-GW Interaction Coefficient | Value of A3 in the groundwater flow formula. |
| Fixed Surf. Water Depth | This is the fixed depth of surface water at the receiving node (in feet or meters). This is set to zero if the surface water depth varies as computed by flow routing. |
| Receiving Node | Lets you select the receiving node by clicking on the desired node in the drawing pane. |