In the center of the municipality of Leun-Biskirchen, two obstacles to migration in the Ulmbach are being redesigned: the entrance weir and an upstream sill. The construction of a fish-passable bassin structure is the main measure at the weir, moreover a selective measure to improve river continuity in the area of the sill.

The entrance weir in the Ulmbach currently represents an obstacle for fish and small creatures; the passability is limited. The migration of fish to their spawning grounds upstream is particularly affected, which makes reproduction difficult for certain fish species.

The measure is being carried out in conjunction with existing renaturation measures in the Natura 2000-area “Ulmbach between Allendorf and Biskirchen” and is intended to contribute to the long-term ecological improvement of the watercourse.

Translated with DeepL.com (free version)