Inlet formula (Water Overlay)

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Inlets are hydraulic structures can pump water in and out of the project area and are connected with a water body outside the project area.

The amount flowing in or out of Inlets is calculated for the cell the Inlet resides on.

Case 1: Inlet:
When calculating Inlets, first the capacities are calculated.

If a lower threshold is defined:

If a positive inlet q Qt is defined:

If a capacity Qtotal is defined:

After calculating the capacities, the actual water inflow is calculated. If any of the terms are undefined, they are not included.

Case 2 Outlets:
When calculating outlets, first the capacities are calculated.

If an upper threshold Tu,t is defined:

If a negative inlet q Qt is defined:

If a capacity Qtotal is defined:

After calculating the capacities, the actual water ouflow is calculated. If any of the terms are undefined, they are not included.

Where:

  • = The water level on the surface relative to datum, at time t.
  • = The LOWER_THRESHOLD of the Inlet at time t.
  • = The UPPER_THRESHOLD of the Inlet at time t.
  • = The INLET_Q of the Inlet at time t.
  • = Computational timestep.
  • = The INLET_CAPACITY of the Inlet.
  • = The calculated previous amounts of flow.
  • = The desired lower water level at the Inlet's location, based on the LOWER_THRESHOLD of the Inlet.
  • = The desired upper water level at the outlet's location, based on the outlet's UPPER_THRESHOLD of the Inlet.
  • = The amount of water inflow (or outflow when negative) possible based on the INLET_Q of the Inlet and timestep Δt.
  • = The total amount of water inflow (or outflow when negative) allowed based on the total capacity of the Inlet.
  • = Size of the Inlet/outlet area in m2, based on the amount of cells and cell size. Current implementation only has one cell.
  • = The amount of water flow which takes place.

Related

The following topics are related to this formula.

Structures
Inlet
Models
Surface model