Settings

Elevate Boundary

Elevate Boundary is a function found in the "Input" section - see "Basics" for more details.

The function requires a set of closed polygons as input. Polygons with an area less than the value given here, will be filtered away from the selection set. The setting has it's primary use to exclude small sized buildings that are insignificant to the analysis. This will also help improve on the overall calculation speed.

Fillsink

Filling sinks refers to the process of modifying the grid model to remove depressions or pits that do not drain to any other cell - see the section "Basics" for more details.

To further avoid flat areas the fillsink operation will incrementally rise the elevation with the given value until it reaches an elevation that secures water to find a way out.

Drainage Line Filtering

When calculating and displaying Drainage Lines the amount of data can seriously affect the performance and calculation time on a computer.  To reduce the amount of data involved, the function is equipped with two filters - Strahler Order and Flow Accumulation Filtering. They can be applied separately or combined.

When applying Flow Accumulation (FA) Filtering - Drainage Lines will not be displayed when the FA value of a grid cell is below the selected option.

To simplify the use of the filter, the function uses a drop-down-list that can be tailored in this setup. The filter will remove grid cells when the FA value is below the percentage relative to the Max value in the model - displayed above the table.

Example:
If the Max FA value i 50 000, using a 1% filter will remove grid cells with a value of 500 and below.

Tip:
If you want to only use Strahler Order for filtering, set all the "Default" values to None.

Peak Runoff

These settings enables calculation of how much water that exits a given Watershed Area. The calculations are done using the Rational Method (Q=C*i*A) and parameters defined by a referred "Runoff" task.

Peak Runoff
The dropdown list will display all available "Runoff" setups - select one 

IDF
The dropdown list will display all "IDF" value-sets within the selected "Runoff" setup - select one 

Display

Using the "Input" chunk, the first option is to reference the "Terrain Watershed Model". Enabling this checkbox will ensure that the calculated Drainage Lines from the referenced "Terrain Watershed Model" will be displayed, but limited to the extent of the "Bounding Box" (aka "Area of Interest") - see this section for further details.

Note: The option is usually only relevant on large models where the amount of "Drainage Lines" can affect the performance when displaying data.

Point Flow

These settings has influence on the "Point Flow Path" tool - see this section for further details.

Z Offset
This setting ensures that the starting cell elevation value is higher than the surrounding neighboring cells.
Recommendation: There is usually no need to adjust this setting unless it is recommended to do so by e.g. support.

Min. Area
This setting will remove all Basins (only from display) with an Area less than the shown input value. This is a way of removing insignificant information of little value to the analysis and can help speed up the overall display time.
Recommendation:  Leave it at zero unless display performance is an issue.