The "Toolbox Fate & Transport Modelling of PMTs in the Environment" is a key deliverable from the H2020 PROMISCES project. This toolbox is a demonstrator that includes a collection of models developed in the PROMISCES project which are designed to assess the fate and transport of persistent, mobile, and toxic substances (PMTs) across various scales (local, regional) and conditions (e.g., urban run-off, bank filtration, unsaturated zone, groundwater).
This toolbox presents the basic information with links to the software and model input files with which the models can be run. This deliverable is intended for qualified modellers. It is complementary with the Guidance document, deliverable D2.4 (Zessner et al., 2025) which describes how to apply modelling tools in a tiered way as part of predictive risk assessment.

The scope of this document, produced as part of the H2020 PROMISCES project, is to provide guidance for applications of models with a specific focus on model trains for the assessment of exposure to PMTs as part of the predictive risk assessment related to surface and groundwater. This document explains the basic concepts of specific models and how best to use them in model
trains in the framework of a tiered approach. The intention is to inform users and interested stakeholders about what needs to be considered when using different methods, what is the best use of specific models, what are the best combinations in model trains and what are their current limitations.

This model is part of the toolbox built within the framework of the PROMISCES project (Deliverable D2.3).

Emission model to calculate the monthly load of pollutants entering various water bodies and watercourses via stormwater and wastewater via the separate sewer system, combined sewer overflows (CSOs) and wastewater treatment plant (WWTP) effluent.

Mischwasserüberläufe nach Starkregenereignissen führen in den Berliner Fließgewässern im Sommer regelmäßig zu Sauerstoffdefiziten bis hin zu Fischsterben. Um solche Zustände zu vermeiden, ist neben der Sanierung des Kanalnetzes die Abkopplung von 20 bis 40 % der angeschlossenen Flächen in den Mischwassereinzugsgebieten notwendig und in Planung. Im Projekt MiSa - Mischwassereinzugsgebietssanierung - wurden im Auftrag der Umweltverwaltung in Workshops mit Berliner Bezirksämtern mögliche Abkopplungsstrategien definiert. Zur Bewertung dieser Strategien wurde eine Modellkette aus Kanalnetz- und Gewässergütemodell aufgebaut, die erstmals eine immissionsbasierte Bewertung ermöglicht und damit die Flächenabkopplung in einen direkten Zusammenhang mit der Gewässergüte stellt.

Highlights

• PFAS and other persistent substances found in industrial urban stormwater runoff

• PFOA-equivalent concentrations for PFAS-24 exceeded EU proposal for surface- and groundwater

• Urban stormwater runoff from industrial sites is one source of PFAS in surface waters