Tuflow and estry manual Version 3

SX	Source of flow from a 1D model.
2D SX cell(s) are connected to a 1D node using a single CN connection (see below). The net flow into/out of the 1D node is applied as a source to the 2D cells. For example, a 1D pipe in the 2D domain “sucks” water out of the upstream cell(s) and “pours” water back out at the downstream cell(s) using 2D SX boundaries. 2D SX boundaries can also be used to model pumps – see “U” flag in Table 4 .25. As of Build 2003-08-AE, if an SX cell falls on an inactive cell (Code -1 or 0), the cell is set as active (Code 1).
Treatment		Sources are applied to all the specified cell(s) whether they are wet or dry, except for SA and SX, which apply only to wet cells, or the lowest dry cell if all the SA or SX cells are dry.
Combinations		Any number of source boundaries can be assigned to the same cell(s) whether they are SA, SH, ST or SX. The source rate applied is the sum of the individual sources.
Connections