Result type (Water Overlay)

The Water Module of a Water Overlay performs complex calculations and multiple types of results can be provided.

Unique results

Each result type represents an aspect of the calculated water simulation, and is accompanied by its own legend. As can be seen in the list below, many result types are supported. The water module can record more than one result type. However, since not all result types can be stored at the same time, only the selected ones are recorded. These results will be stored in individual overlays.

There is always one general Water Overlay. The configuration for the calculation is only defined in this overlay, which makes it easier to verify and configure the used simulation parameters. Result child overlays can be added to this Water Overlay to store additional result types. The advantage of using result child overlays are that for any given water overlay, the calculation of the overlay only occurs once, rather than multiple times equal to the amount of desired result types.

It is currently only possible to add result child overlays via the configuration wizard, in the step regarding output overlays.

Naturally, the results can be seen visually. They can also be inspected in more detail, and also exported.

Changing a result type

When the result type of the Water Overlay or any of its children, is changed, the legend is updated automatically. However, the data for this new result type must still be calculated. This may result in the visual output of the overlay changing, because the unchanged data is displayed with a new legend. When changing the result types, it is recommended to force a recalculation of the overlay before inspecting the results.

List of Result Types

Icon	Result type	Unit	Display mode	Description
	WATER_STRESS	m (mm)¹	Maximum	The amount of water on the surface, similar to SURFACE_MAX_VALUE. However, for water terrains, the water height must rise by at least ALLOWED_WATER_INCREASE_M. Otherwise, the reported value in those locations is 0.
	EVAPORATED	m (mm)¹	Total	The amount of water that has evaporated. The value is the sum of the quantities evaporated from the surface and the underground.
	SURFACE_LAST_DIRECTION	geo angle (0-360°)	Last	The last direction in which water is flowing across the surface.
	SURFACE_AVG_DIRECTION	geo angle (0-360°)	Average	The average direction in which water is flowing across the surface.
	SURFACE_DURATION	s (min)¹	Total	The amount of time the water depth on the surface exceeds SHOW_DURATION_FLOOD_LEVEL_M.
	SURFACE_ELEVATION	m + datum	Start	The rasterized version of the terrain height for use in the water overlay's calculations.
	SURFACE_FLOW	m³/m²	Last	The amount of water which has flowed through a given location.
	SURFACE_LAST_DATUM	m;	Last	The datum height of the water level on the surface.
	SURFACE_LAST_SPEED	m/s	Last	The (horizontal) speed of water flow.
	SURFACE_LAST_VALUE	m (mm)¹	Last	The amount of water on the surface.
	SURFACE_MAX_SPEED	m/s	Maximum	The (horizontal) speed of water flow.
	SURFACE_MAX_VALUE	m (mm)¹	Maximum	The amount of water on the surface.
	BUILDING_LAST_STORAGE	m (mm)¹	Last	The amount of water caught in building storage.
	GROUND_LAST_STORAGE²	m (mm)¹	Last	The (effective) amount of water in the underground unsaturated zone.
	GROUND_LAST_VALUE³	m (mm)¹	Last	The distance between the terrain surface and the groundwater level.
	GROUND_MAX_STORAGE²	m (mm)¹	Maximum	The (effective) amount of water in the underground unsaturated zone.
	GROUND_MAX_VALUE³	m (mm)¹	Maximum	The distance between the terrain surface and the groundwater level.
	GROUND WATERTABLE³	m + datum	Last	The groundwater level, relative to datum.
	SEWER_LAST_VALUE	m (mm)¹	Last	The amount of water stored in the sewer.
	SEWER_MAX_VALUE	m (mm)¹	Maximum	The amount of water stored in the sewer.
File:Overlay icon water substance a.png	SUBSTANCE_A	x/m²	Last	The amount of substance A present. The value is the sum of the quantities on the surface, and in the underground.
File:Overlay icon water substance b.png	SUBSTANCE_B	x/m²	Last	The amount of substance B present. The value is the sum of the quantities on the surface, and in the underground.
File:Overlay icon water substance c.png	SUBSTANCE_C	x/m²	Last	The amount of substance C present. The value is the sum of the quantities on the surface, and in the underground.
File:Overlay icon water substance d.png	SUBSTANCE_D	x/m²	Last	The amount of substance D present. The value is the sum of the quantities on the surface, and in the underground.
	BASE_TYPES	nominal value	Start	Categorization of the individual cells based on how they are processed by the water model, displaying which cells are considered to be specific features.
	DEBUG_UV	m3s-2	Last	The wave part of each flux component in the 2D Saint-Venant system.
	SURFACE_DIFFERENCE	m (mm)¹	Last	The difference between the original water level and the water level of the last timeframe.
	GPU_OVERVIEW	nominal value	Maximum	Shows which GPU cluster calculated which part of the overlay.
	IMPACTED_BUILDINGS	nominal value	Maximum	Constructions impacted by excess water, with the definition of "impacted" as defined by IMPACT_FLOOD_THRESHOLD_M.

¹ the units between () are as displayed in the 3D client. If exported to GeoTiff the SI-convention is used: meters (m) and seconds (s).
² these require the Ground water mode to be set to either COMPLETE or INFILTRATION ONLY.
³ these require the Ground water mode to be set to COMPLETE.

Result types can differ in the kind of data they display, the layer (surface or underground) of which they display that information, and how that data is recorded. Different result types can monitor data in the following ways:

• Start: The data is determined at the start of the simulation and does not change afterwards.
• Last: The data is the latest value determined at the timestep the data is recorded. The values can increase and decrease between different timesteps. This mode is primarily used for monitoring progression.
• Average: The data is the average value based on previous values up until the timestep the data is recorded.
• Maximum: The data is the highest value determined up until the timestep the data is recorded. The values can only increase or stay the same, but will never decrease. This mode is primarily used to gain insight into impact; the most severe situation any point had to endure.
• Total: The result of a running tally, counting the relevant data up until the timestep the data is recorded. The value can only increase or stay the same, but will never decrease. This mode is primarily used to gain insight into quantities rather than duration.

Notes

• Although it is possible to duplicate the overlay, and set the copy of the overlay to a different result type, we strongly advice to use child overlays instead. Downsides of the duplication approach are:

1. the simulation has to run in full multiple times, causing a severe increase in calculation time.
2. when changes to the overlay's configuration have to be made those changes need to be made to all water overlays.

• Result child overlays do not recalculate if either they or their parent is set to inactive.
• If a calculation overlay is removed, all result child overlays of that overlay are removed as well. Separate overlays set as child overlays (such as input overlays) of the overlay will not be removed.

How-to's

• How to add and remove a Result type

See also

• Other types of Water overlay results.

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Water Module

Water Module

Tutorials

Overview

Theory

Benchmarks

Group

Result types

Surface

Building last storage • Evaporated • Flood arrival time • Flood rise rate • Last evaporated • Last rain • Rain • Surface avg direction • Surface duration • Surface elevation • Surface flow • Surface last datum • Surface last direction • Surface last flow • Surface last speed • Surface last value • Surface last u • Surface last v • Surface max speed • Surface max value • Water stress

Underground

Ground bottom flow • Ground flow • Ground last direction • Ground last storage • Ground last value • Ground max storage • Ground max value • Ground watertable • Ground last unsaturated storage • Ground last unsaturated fraction

Sewer

Sewer last value • Sewer max value

Substances

Tracer a • Tracer b • Tracer c • Tracer d

Other

Base types • Debug uv • Debug uv direction • Debug avg areas • Debug waterways • Gpu overview • Impacted buildings • Surface difference

Related

Results