Flow versus Time (m3/s) over an area,
or
Rainfall versus Time (mm)
Applies the flow directly to the cells within a polygon as a source. Negative values remove water directly from the cell(s). Most commonly used to model rainfall runoff directly onto 2D domains with each polygon representing the sub-catchment of a hydrology model. SA boundaries have their own command, Read MI SA, and own GIS layer (see Table 4 .26).
The default option is to apply the boundary as a flow hydrograph as follows. Within each SA catchment (region), if all the 2D cells are dry, the flow is directed to the lowest cell based on the ZC elevations. If one or more cells are wet the total flow is distributed over the wet cells.
As of Build 2005-05-AN, a rainfall hyetograph can be applied. The rainfall time-series data must be in mm versus hours, and is converted to a hydrograph to smooth the transition from one rainfall period to another. This approach applies a rainfall depth to every active cell (ie. Code 1 cells) within each region, and essentially replaces the need to use a hydrological model. Initial and continuing losses can be applied on a material-by-material basis (see Read Materials File). Note, this approach is being trialled and tested as of the time of writing and is considered an under-development feature that may be subject to change.
SH
Flow versus Head (m3/s)
Extracts the flow directly from the cells based on the water level of the cell. Used for modelling pumps or other water extraction. Flow values must not be negative. SH boundaries can be connected to another 2D cell or a 1D node, to model, for example, the discharge of a pump from one location in a model to another. The connection is made using a “SC” line (see below). In the boundary database, the Column 1 data would be head or water level values and the Column 2 data would be flow. The flow value is the rate per 2D cell. If the 2D cell becomes dry, no flow occurs. Feature incorporated in Build 2003 03 AD.
ST
Flow versus Time (m3/s)
Applies the flow directly to the cells as a source. Negative values remove water directly from the cell(s). Can be used to model concentrated inflows, pumps, springs, evaporation, etc.
