Flood protection for the municipality of Wiesendangen
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Description & Project Overview
Service November 9, 2026 | Specialist mandate for architecture SIA phases 32/33 and optional SIA phases 41 - 53: The community of Wiesendangen is repeatedly affected by flooding from the Wisenbach and Bachtobelgraben as well as damage from surface runoff. There are significant flood risks, particularly in the village center, due to insufficient channel capacity, culverts and bridges that are too small, and historical flood events. To ensure the safe derivation of an HQ30, a partial expansion and ecological upgrading of the Wisenbach is planned.
To protect against HQ100, the water is specifically channeled over the village streets on both sides. Folding bulkheads, hilltops, walls and terrain adjustments prevent it from getting into neighborhood streets, gardens or buildings. In addition, property protection measures are intended to protect individual residential and commercial buildings.
The mandate advertised here covers the planning services in the field of architecture for SIA phases 32 to 53, with phases 41 to 53 being advertised as an option. According to the Federal Inventory of Switzerland's Sites of National Importance (ISOS), Wiesendangen is a rare and unique example of a stream line village in the canton of Zurich. The spatial and architectural qualities are rated as very high.
The town center of Wiesendangen is also included in the inventory of sites of supra-communal importance that are worthy of protection. The challenge from an architectural perspective is primarily to integrate the property protection measures into the historically valuable and protected town center of Wiesendangen in such a way that, on the one hand, they ensure the necessary protection against flooding and, on the other hand, they are compatible with the requirements of ISOS and monument protection. Municipality of Wiesendangen (F. Preisig AG)