Water Overlay ground model cheatsheet

Core principles

In the 2-dimensional grid model of the Tygron Platform, water infiltrates from the surface, infiltrates through the unsaturated zone and is partially stored, after which it reaches the saturated zone. Here, horizontal flow occurs, depending on hydraulic gradients and permeability, and everything is simulated in a time-dependant context. There is no vertical (and no radial) flow in the saturated zone.

Unsaturated zone Terrain Type: Attributes

Parameter	Unit	Description
UNSATURATED_FRACTION	fraction	Initial value saturation E.g. 0.5 means pores are 50% filled with water.
WATER_STORAGE_PERCENTAGE	m³/m³	Effective porosity. Determines water storage capacity.
GROUND_INFILTRATION_MD	m/day	Maximum infiltration speed in this type of terrain.