TWO-WAY: Select the radio button next to ‘Two way’ in the Head Dependent option box to apply two-way head-dependent flux boundary conditions. Click the ‘>>more’ link to open the Edit Polyline Attributes sub-menu. By default, the stage along the polyline is equal to the aquifer top elevation, as indicated by the checked box next to ’Stage = TopE minus’ and the value of 0 in the corresponding text box. Similarly, the default bed elevation (stream bottom) is 1 m below the stage elevation. Offsets may be applied by entering a different value(s) in the text box(es).
If the stage is known at each vertex location, the user can edit the stage value (in meters) by clicking anywhere within a cell in the Stage(m) column (note that each row corresponds to a different VertexID). Similarly, the leakancy (Leak(m/day)), bottom elevation (BotE(m)), and stream order (Order) can be customized for any cell in the table. Use the drop-down menu to select a column in which all values will be set to the value entered in the corresponding text box. Click ‘Apply’ to update the selected column.
ONE-WAY: The steps to apply One-way head dependent flux are similar to that of two-way. Select the radio button next to ‘One way’ in the Head Dependent option box, then click the ‘>>more’. By default, the “drain elevation” (i.e., the elevation used to compute the head gradient) is equal to the aquifer top elevation, as indicated by the checked box next to ’Stage = TopE minus’ and the value of 0 in the corresponding text-box. An offset may be applied by entering a non-zero number in the text box.
If the drain elevation is known at each vertex location, the user can edit the drain elevation values (in meters) by clicking anywhere within a cell in the BotE(m) column (note that each row corresponds to a different VertexID). Similarly, the leakancy (Leak(m/day)) and stream order (Order) can be customized for any cell in the table. Use the drop-down menu to select a column in which all values will be set to the value entered in the corresponding text box. Click ‘Apply’ to update the selected column