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50px|none|Symbol System Element Diversion

Splitting structures are used to divide an inflow into two outflows according to a distribution rule. Possible forms are withdrawal structures from rivers for supply or irrigation purposes, branching into overpasses, discharges in the inlet or outlet of dams, rain overflows, etc.

Three approaches are possible as distribution rules.

Threshold value model (Option 1)

thumb|Discharge_division_by_Threshold_ConceptHere the second discharge is only activated from a critical inflow Qkrit. In the threshold value model, the 2nd outlet (e.g. RÜ: outlet channel) is only pressurized from a critical inflow Qcrit where the 1st outlet (e.g. RÜ: throttle) backs up to the overflow threshold. Since in reality a perfect division of the outflows after reaching the threshold value is usually not possible, the selectivity for the structure can also be specified for better recording of the actual conditions. thumb| Definition of the parameter Discriminatory Power in Talsim-NG It is defined as: [math]\displaystyle{ \mbox{selectivity }= \frac{Q_{ab}(Q_{zu}=5 \cdot Q_{krit})}{Q_{krit}} }[/math]

Percentage distribution (option 2)

Regardless of the inflow, a constant division into two sequences Qab1 and Qab2 is made according to a certain percentage ratio. Also here, it is possible to change the division through scaling.

Characteristic Curve (option 3)

A dependency between the discharge Qab1 and the inflow resulting from hydraulic calculations or from operating regulations is used as a polygon course. The second drain Qab2 is determined as the residual value between inflow - Qab1.