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 |