Surface water (Water Overlay)

Icon	Attribute	Unit	Range	Description	Default value
	SURFACE_WATER	Nominal value		Whether and how water on the surface is simulated during the calculation.	Shallow

0.	None: Water on the surface can only infiltrate and evaporate, but it will not flow between neighboring surface cells.
1.	Shallow: Evaluation of the shallow water equations are applied to water in waterways and on land. This option is selected by default.
2.	Avg Waterway: Water levels are averaged each time frame for each identified waterway. Shorelines around waterways are also taken into account when averaging a waterway. Water flows between waterways using hydraulic structures. Water does not flow between grid cells on land. On land it can only move vertically (infiltrate or evaporate) or interact with hydraulic structures or hydrological features. The threshold attribute AVG_SHORE_WIDTH_M is used to determine the maximum allowed distance to the waterway for shoreline cells.
3.	Hybrid: Water on land is calculated as if using the Shallow mode. Water in waterways (and on their shorelines) is calculated as if using the Avg Waterway mode.
4.	Avg Terrain: Similar to Avg Waterway, with the exception that surrounding land is also included. The model attribute AVG_TERRAIN_WIDTH_M is used to determine the maximum allowed distance to the waterway for land cells around the waterways, and land which can so be associated is associated with the nearest waterway. Water on terrain cells is only averaged when their level is higher than the configured model attribute AVG_TERRAIN_STORAGE_M.

Notes

• Avg Waterway, Avg Terrain and Hybrid are Grid Averaging surface water modes.

How-to's

• How to add and remove an Attribute

Videos

Grid averaging in the Tygron Platform. (In dutch)

See also

• Surface model (Water Overlay)
• Ground water (Water Overlay)
• Mode (Water Overlay)

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Water Module

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Model attributes

Model attributes

Allowed water increase m • Avg shore width m • Avg terrain width m • Avg terrain storage m • Breach measurement distance m • Bridge elevation • Culvert dem threshold m • Design flood elevation m • Extended reconstruction • Ground bottom distance m • Ground bottom pressure m • Ground water • Ground water depth m • Ground watertable with surface • Impact flood threshold m • Impact range m • Increased resolution • Infiltration factor s

Limit area • Limit rain • Max infiltration m • Max water bottom m • Microrelief storage fraction • Min max elevation • Object entry correction • Prequel surface level relative • Rise rate distance m • Sewer overflow threshold • Shoreline • Show duration flood level m • Stabilizer angle • Start date ms • Surface water • Surface water evaporation factor • Timeframe times • Timeframes • Unsaturated fraction • Weir dam multiplier • Weir move interval s • Weir move range m • Weir move step m

Related

Building attributes • Hydrological features • Hydraulic structures •  Terrain attributes • Results • Simulation data