Unsaturated fraction prequel (Water Overlay)

Name	Prequel	Underlying data	Unit	Range	No data	Description
Unsaturated fraction	UNSATURATED_FRACTION	Water Prequel		0 to 1	Clamped to range	Used for initializing the saturation of the unsaturated zone in the underground.

Notes

• The values in this prequel grid are clamped between 0 and 1. No data values are not allowed, but negative values are interpreted as zero saturation.
• Note that this fraction is relative to the maximum water storage capacity of the terrain and not relative to the underground terrain volume. This amounts to the following formula:
  Amount of water in the unsaturated zone = relative ground water depth * WATER_STORAGE_PERCENTAGE * UNSATURATED_FRACTION.
• For example, an underground terrain with a water storage of 25% and a ground water depth of 1 m and a configured unsaturated fraction of 0.25 will result in 0.0625 meter water in the unsaturated zone. (25% of 25% of the total volume of 1 m3)

See also

• Unsaturated fraction (Water Overlay)
• Terrain water storage percentage (Water Overlay)

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