Prequels (Water Overlay)

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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 Description Range No data
Terrain elevation TERRAIN_ELEVATION Water Prequel Used for initializing the terrain elevation on this datum. -10000 to 10000 Clamped to range
Surface level SURFACE_LEVEL Water Prequel Used for initializing the surface water level on this datum, both in waterways and on land. -10000 to 10000 Clamped to range
Groundwater depth GROUND_WATER_DEPTH Water Prequel Used for initializing the ground water level to these depths.
Groundwater datum GROUND_WATER_DATUM Water Prequel Used for initializing the ground water level on this datum.
Unsaturated fraction UNSATURATED_FRACTION Water Prequel Used for initializing the saturation of the unsaturated zone in the underground. 0 to 1 Clamped to range
Bottom Resistance BOTTOM_RESISTANCE Water Prequel days A grid of values containing the resistance of the lower layer against the seepage. 0 to 1000000 Clamped to range
Bottom Pressure BOTTOM_PRESSURE Water Prequel A grid of values containing the head of the ground water pressure caused by ground water in higher regions outside the project area. -1000000 to 1000000 Clamped to range
Max infiltration MAX_INFILTRATION Water Prequel M Used in Infiltration only mode to limit the maximum amount of storage per gridcell. 0 to 1000000 Clamped to range
Manning MANNING Water Prequel Used for overriding the surface terrain's manning value. 0.01 to 1 Clamped to range


Water Module
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Water Module
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Group
Weather
Rain m • Evaporation m
Prequels
Bottom pressure • Bottom resistance • Groundwater datum • Groundwater depth • Manning • Surface level • Terrain elevation • Unsaturated fraction
Elevation
Elevation
Related
Building attributes • Hydrological features • Hydraulic structures •  Terrain attributes • Model attributes • Results
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