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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 by scaling

Kennlinie (Option 3)

Eine aus hydraulischen Berechnungen oder aus Betriebsvorschriften resultierende Abhängigkeit zwischen dem Abfluss Qab1 und dem Zufluss wird als Polygonzug benutzt. Der zweite Ablauf Qab2 ermittelt sich als Restwert zwischen Zufluss – Qab1.