Prequels (Water Overlay)

Prequel overlays can be linked to the Water Overlay to initiate particular parts of the model with more accuracy and detail. They can even be used to link result types of one Water Overlay as prequel input to another.

Name	Prequel	Underlying data	Unit	Range	No data	Description
Bottom distance	BOTTOM_DISTANCE	Water Prequel	m	0 10000	Clamped to range	Used for initializing the bottom distances.
Bottom Resistance	BOTTOM_RESISTANCE	Water Prequel	days	0 to 1000000	Clamped to range	A grid of values containing the resistance of the lower layer against the bottom boundary flow.
Bottom Pressure	BOTTOM_PRESSURE	Water Prequel	m datum	-1000000 to 1000000	Clamped to range	A grid of values containing the head of the ground water pressure caused by ground water in higher regions outside the project area.
Ground conductivity	GROUND_CONDUCTIVITY	Water Prequel	m2/day or m/day	0 10000	Clamped to range	Used for initializing the ground conductivity, with or without thickness.
Ground infiltration	GROUND_INFILTRATION	Water Prequel	m/day	0 to 10	Clamped to range	Ground (e.g. clay) vertical infiltration in meters per day.
Groundwater datum	GROUND_WATER_DATUM	Water Prequel	m datum	-10000 10000	Clamped to range	Used for initializing the ground water level on this datum.
Groundwater depth	GROUND_WATER_DEPTH	Water Prequel	m	0 10000	Clamped to range	Used for initializing the groundwater level to these depths.
Manning	MANNING	Water Prequel		0.01 to 0.255	Clamped to range	Used for overriding the surface terrain's manning value.
Max infiltration	MAX_INFILTRATION	Water Prequel	m	0 to 1000000	Clamped to range	Used in Infiltration only mode to limit the maximum amount of storage per gridcell.
Microrelief	MICRORELIEF	Water Prequel	m	0 to 0.255	Clamped to range	Used for initializing the height of microrelief hills.
Sewer Level	SEWER_LEVEL	Water Prequel	m	0 to Sewer Storage M	Clamped to range	Initial filling of the sewer in M.
Surface infiltration	SURFACE_INFILTRATION	Water Prequel	m/day	0 to 10	Clamped to range	Surface (top part, e.g. roads) vertical infiltration in meters per day.
Surface level	SURFACE_LEVEL	Water Prequel	m	-10000 to 10000	Clamped to range	Used for initializing the surface water level on this datum, both in waterways and on land.
Surface u	SURFACE_U	Water Prequel	m/s	-10 to 10	Clamped to range	Used for initializing the initial speed of the surface water in the x-direction.
Surface v	SURFACE_V	Water Prequel	m/s	-10 to 10	Clamped to range	Used for initializing the initial speed of the surface water in the y-direction.
Terrain elevation	TERRAIN_ELEVATION	Water Prequel	m datum	-10000 to 10000	Clamped to range	Used for initializing the terrain elevation on this datum.
Unsaturated fraction	UNSATURATED_FRACTION	Water Prequel		0 to 1	Clamped to range	Used for initializing the saturation of the unsaturated zone in the underground.

API Endpoints

• Api session event editor overlay set prequel

---

Water Module

Water Module

Tutorials

Overview

Theory

Benchmarks

Group

Simulation data

Weather

Rain m • Evaporation m

Prequels

Bottom distance • Bottom pressure • Bottom resistance • Ground conductivity • Groundwater datum • Groundwater depth • Manning • Max infiltration • Microrelief • Sewer level • Surface level • Surface u • Surface v • Terrain elevation • Unsaturated fraction

Elevation

Elevation model

Related

Building attributes • Hydrological features • Hydraulic structures •  Terrain attributes • Model attributes • Prequels • Results