To create a new node (demand site, groundwater node, river node, wastewater treatment plant or flow requirement), merely click on the node's symbol in the WEAP legend and drag it anywhere inside the main schematic. To create a new river or diversion, click on the symbol (a line segment) in the legend and drag onto the main schematic, then release the mouse button to specify the headflow. Next, single click once for each intermediate point on the river, then double click to specify the endpoint of the river, as modeled in this particular system. Objects cannot be created if the schematic is Locked.
When you create a node or river, you will be prompted to enter the object's Name, a Schematic Label (used only for display on the schematic), and whether or not it is Active in the Current Accounts. The label can be displayed as multi-line text -- use semicolons to indicate line breaks. The label will be displayed below the object. However, you can move the label anywhere you want to enhance the legibility of the Schematic. Right click on the object and choose the Move Label option. When you create a catchment, you will specify if it Includes Irrigated Areas or not. When you create a demand site or irrigated catchment, you choose whether to specify the Demand Priority for the demand site or catchment, or the Priority is on the Transmission Link. When you create a demand site, irrigated catchment, reservoir or flow requirement (and the priority is not on the transmission link), you will be prompted to enter its Demand Priority. You may not give the same name to two objects of the same type, for example, two demand sites may not have the same name (although their map labels can be the same).
A river consists of a headflow point, an endpoint, and zero or more points in between. You may add as many bends in the river as you wish, to more closely approximate the actual shape of the river. To add a new bend in the river, just click on any straight section of the river and drag to create a bend.
To add a new transmission (i.e., withdrawal) or return link, click on the symbol (a line segment) in the legend for the desired type of link and drag onto the main schematic, releasing the mouse button on the node or river where the link originates. Next, single click once for each intermediate point on the link, then double click on the destination node. You will be prompted to enter the demand site's Supply Preference for the supply connected to this transmission link, unless the demand site has the priority on the transmission link, in which case you will enter the transmission link's Demand Priority instead.
For instance, to create a transmission link from a local reservoir to a demand site, click on the transmission link symbol in the legend, drag it to the local reservoir and release, then double click on the demand site. To later add new bends in the link, just click on any straight section of the link and drag to create a bend.
River withdrawal nodes will automatically appear if you start a transmission link from a previously unused place along the river. Similarly, a return flow node will automatically appear if you end a return flow link on a previously unused place along the river, and a catchment inflow node will automatically appear if you end a runoff/infiltration link on a previously unused place along the river
Catchment Runoff Links are created in a similar way; drag the Runoff/Infiltration symbol from the legend first to the particular Catchment, single click, then double click on the river or groundwater node where the Catchment Runoff is to be directed. If you position the Catchment Runoff anywhere above the first node of a river, the dialog box that appears will ask if you wish this runoff to represent headflow to the river. If you do select the Catchment Runoff as headflow to the river, the Headflow variable for that river will be set/locked to "Inflow from Catchment" in the Data view. No other sources of headflow can be input for that river using the direct input methods (for example, the Read from File method). This is in contrast to groundwater nodes, where sources of inflow in addition to Catchment Runoff can be input from Read from File or Expressions.
To link one groundwater node to another -- to model subsurface flow between the two -- add a runoff/infiltration link connecting the two nodes.