Measures of ecological patency on River Lieser and Moselle

Structure Project at river “Lieser“ Conversion of weirs – Fish pass – Rock ramp Barrage near “Koblenz“ Reason for water management Water management office – Fields of activity

Project at river “Lieser“ “Lieser“ – 74 km long – flows into “Mosel“ project – conversion or removal of 16 weirs – building of fish passes and rock ramps

Field trip to the River Lieser in cooperation with the Water Management Authorities of Rhineland-Palatinate Along the River Lieser there were 15 barrages (weirs) to supply water energy to the mills  fish and other aquatic organisms could not move upstream.

Weir before conversion weir  50 m long  2.20 m high inefficient fish pass  5 m long

Construction of fish pass fish pass  m long  17 small dams of regular length  fall step between dams 10 cm series of small dams

After conversion with fish pass

Weir before conversion 1.70 m

Construction of rock ramp rock ramp – 47 m long – large rocks (2.50 t) – system of rocks (so they don´t move in case of floodings)

After conversion

The barrage near “Koblenz“ 3 locks hydroelectric power plant fish pass “Mosel“

Fish pass

Water is a precious resource Water shortage exist -> water management needed Water management involves principles for the careful use of water – protection and pollution control in all waters – maintenance and improvement of the ecological condition of streams and rivers – sustainable use of water resources

Water management office Main tasks: – Water management planning – Supervision of waters – Administration of public water resources – Promotion of water management – Preparation of expert reports on the following: water supply, wastewater disposal, water protection, river control, industrial pollution control