| Barriers & booms


designed primarily for visual demarcation and controlled water zoning. These systems feature: ● Larger-diameter floats (typically 600–1,000mm). ● Bright coloration (yellow, orange, or red). ● Integrated reflective strips and navigation lights. ● Optional signage mounts or sensor brackets. Although lighter than debris-containment systems, these barriers still provide moderate interception capability for plastics, vegetation, and light timber. In dam and reservoir environments, demarcation barriers are commonly used to: ● Mark restricted zones near intakes and spillways. ● Separate operational and recreational areas. ● Indicate environmentally protected water zones. ● Support monitoring infrastructure. Their secondary function of debris interception further reduces material accumulation near sensitive hydraulic equipment.


Operational principles and


application Floating barrier systems operate by combining passive hydrodynamic deflection with physical interception. As water currents transport debris downstream, the


floater or the submerged skirt creates drag that redirects material toward collection zones or riverbanks. Larger objects are retained by the float line, while smaller debris accumulates along the barrier until scheduled removal. For dam operators, this approach offers several advantages: ● Reduced mechanical load on trash racks and intake screens.


● Lower maintenance frequency for turbines and gates.


● Improved water flow predictability. ● Enhanced operational safety for inspection crews. ● Protection of environmentally sensitive shoreline.s Typical application areas include:


● Upstream of hydropower intakes. ● Reservoir inflow zones. ● Spillway approaches. ● Navigation locks. ● Cooling water intakes for thermal power stations. ● Flood-prone river sections above dams.


Field experience River border between Ukraine and Transnistria A barrier installation was implemented on a wide river section forming a natural border between Ukraine and Transnistria. The area experiences seasonal floods with debris, and and frequent unauthorised small-vessel crossings. The barrier system was configured in a shallow V-shape to guide debris toward a designated collection bank. During peak spring runoff, the installation successfully intercepted large volumes of branches and tree trunks, preventing their entry into downstream hydraulic structures and bridge zones. Local water management authorities noted stable positioning even under elevated current velocities and reported minimal maintenance requirements beyond periodic debris removal.


Mountain river debris protection In a mountainous river catchment, floating barriers were used to protect a small reservoir from storm-driven debris flows and common waste. This environment


posed unique challenges due to: ● High flow velocities. ● Sudden water level changes. ● Large, irregular wooden debris and general waste. A reinforced barrier model with additional tension cables and shallow skirts was selected. During multiple storm events, the system retained substantial volumes of organic material while remaining structurally intact. Post-event inspections confirmed no connector


failures or significant float deformation, validating the suitability of modular floating barriers even in aggressive hydrological conditions.


Ukrainian seaports Protective floating barriers were deployed in multiple Ukrainian commercial ports to manage driftwood and floating waste entering harbor basins and approach channels. The systems were installed in segmented lines across secondary inlets and near cargo handling zones. Over two seasonal cycles, port authorities reported: ● A reduction of floating debris accumulation by approximately 65–75%.


● Improved accessibility of berths after storm events. ● Decreased downtime for mechanical cleaning operations.


● No structural damage to the barriers despite frequent vessel wash and winter ice fragments.


Technical considerations For long-term dam and reservoir applications, several


design parameters are critical: ● Hydrodynamic loading calculations to ensure adequate tensile strength.


● Redundancy in mooring lines to prevent failure under asymmetric loads.


● Ice-pressure resistance for cold climates. ● Maintenance accessibility, including safe work zones for debris removal.


● Environmental compatibility, avoiding harmful leaching or wildlife entanglement. When properly engineered, floating barrier systems typically achieve service lives of 10–15 years with routine inspection and component replacement. Floating barrier systems represent a practical, cost- effective infrastructure element for protecting dams and reservoirs against debris ingress, operational disruption, and environmental impact. Beyond their traditional security associations, these systems play a vital civil-engineering role in modern water power management.


Below: Demarcation barriers have several purposes on a dam and reservoir environment


Above: Floating barrier systems operate by combing passive hydrodynamic deflection with physical interception


More information www.econad.co.uk


www.waterpowermagazine.com | February/March 2026 | 39


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