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### PECinitial

The PEC initial is defined as the spatial aggregation of concentrations in the river directly after emission. This is comparable to PEClocal as defined in the EU Technical Guidance Documents, although its calculation is different. Based on the C sim, start values, the mean is calculated for all directly loaded stretches.

By definition, the PEC initial is calculated on the base of the C sim, start mean values of the stretches directly receiving treated or untreated waste water discharges. Selecting the item PECinitial the calculation starts.

Please note that PEC calculations are not available if a subcatchment is selected.

After the calculation a dialog displays the result alongside additional information.