The current (2025) Swiss national framework for municipal drainage planning, replacing the 2010 Musterpflichtenheft. Every Swiss municipality must maintain a Genereller Entwässerungsplan (GEP) and update it on an 8–10-year cycle. The Leitfaden covers situation analysis, sub-project scoping, data management and an action plan — validating the sub-catchment approach and source-control logic used throughout the IUWMP.
VSA (2025): Leitfaden GEP 2025 – Generelle Entwässerungsplanung. Glattbrugg: Verband Schweizer Abwasser- und Gewässerschutzfachleute (VSA). URL [Accessed: 15.04.2026] PDF