Creating a blue wildlife corridor in the Rega basin

Przepławka w Jarchlinie

General information: fish pass located on Dobra river in its 1+000 kilometer. It allows migration of water organisms through traverse obstacle – water step under the bridge on Dobra river. Water steps consists on weir and earth dam, that is ca 120 meters long. Weir was made to drive watermill. Its broken parts, dug under layers of earth, can be found untill this day, in around 150 meters from weir. In the 60’s weir was renewed, to pile waters for hydration.

Description of fish ladder: Rock-ramp fishway, with lenght of around 48 meters, and 1,80 meters bottom wide. Its slope changes between 4 and 5%. Entirety of flow, that goes through the weir was directed to fishway. Slopes were enhanced with rock filling, placed on geotextile. On the bottom of the fish pass, chicanery was placed. Chicanery are elements that disperse Energy, lower velocity of water flow, and become a shelter for water organisms.