Water balance (Water Overlay)

A water balance with multiple input and output entries.

Editor → Current Situation (Ribbon tab) → Overlays (Ribbon bar) → The Water Overlay (Left panel) → General tab (Right panel) → Show water balance

During the simulation, a tally is kept of the total amount of water which the hydrological model is initialized with, how much flows in and out, and how much is left in various layers when the simulation completes. The overview of these tallies is known as the water balance, and can be accessed after the calculation has completed. It will display water categorized into input (where it was initialized and/or how it entered the hydrological system) and output (where in the hydrological system it ended up, or through which path or process it left the hydrological system).

The following entries are displayed:

Input	Configuration	Result	Output	Configuration	Result
Water surface	Water area, Surface level prequel		Water surface		Surface last value
Inundated	Inundation area	Surface last value	Land Surface		Surface last value
Rain	Rain m, Rain areas	Rain	Evaporated	Evaporation m	Evaporated
			Building Storage	Water storage m2	Building last storage
			Sewer Storage	Sewer storage	Sewer last value
			Sewer Out External	Sewer pump speed	Object flow output
Breach	Breach	Object flow output	Breach Out	Breach	Object flow output
Inlet	Inlet	Object flow output	Outlet	Outlet	Object flow output
Bottom in	Bottom Pressure and Resistance prequels	Ground bottom flow	Bottom Out	Bottom Pressure and Resistance prequels	Ground bottom flow
Saturated Ground Storage	Ground water depth m, Water areas, Ground bottom distance m Groundwater depth or Groundwater datum, Bottom distance prequels		Saturated Ground Storage
Unsaturated Ground Storage	Unsaturated fraction, prequel	Ground last unsaturated storage	Unsaturated Ground Storage		Ground last unsaturated storage

For completeness, a total for both water input and output is displayed, as well as a check on any eventual water loss in the system. Depending on the size of the project area and the amount of water flowing through various cells, there may be a minor difference between the input and output due to numerical rounding. In these cases the difference should amount to less than a tenth of a millimeter of water per cell in the calculation.

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Water Module

Water Module

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Output keys

Object flow output • Object height output • Object datum output a • Object datum output b • Object width output

Output other

Result type • Water balance • System visualization • Weather visualization • Debug info

Related

Building attributes • Hydraulic structures • Hydrological features •  Terrain attributes • Model attributes • Simulation data