Locks and weirs
Waterway locks (Jochenstein, Aschach, Ottensheim, Abwinden-Asten, …) between Passau and Vienna. Inspection of weir bodies, lock gates (water side), stilling basins and bed protections.
Waters · River
Underwater Inspection at the Danube — Waterway, Locks, Bridge Structures
As an international waterway between Passau and Vienna, the Danube is intensively developed by dense shipping, lock structures, hydropower impoundments and bridges. ScanSustain inspects locks, weirs, bridge piers and groynes ROV-based — diver-free and with a sonar workflow for the turbid water regime.
Characteristic Structures
These structure types can be inspected ROV-based at the Danube — subject to approval from local authorities and operators:
Groyne heads
Danube groynes as regulating hydraulic structures with high scour susceptibility. Findings capture of the groyne-head area, the bed downstream of the groyne and the groyne-root connection at the bank.
Bridge piers
Danube bridges (railway and road) with pier foundations at 8 to 25 m water depth. Capture of scour, frost damage and current component condition.
Port facilities
Danube ports Linz, Enns, Vienna, Krems, several commercial ports. Inspection of quay walls, berths, ship-guidance facilities and turning basins.
Typical Damage Patterns
What can be professionally captured at the Danube — a structured overview of the locally typical damage patterns:
Scour at groynes and bridges
The Danube is scour-active: downstream of groynes deep scour holes form (up to 5 m below the bed), at bridge piers local scour with a depth extent relevant to structural stability.
Corrosion at sheet-pile structures
Harbour-basin sheet-pile walls with marked corrosion progress. Capture of wall thickness and pitting as a basis for assessing the remaining service life.
Bedload deposits
Sediment deposits in harbour basins and lock forebays. Structured capture as a basis for planning dredging measures.
On-Site Methodology
Danube water is typically turbid (visibility 0.2 to 0.8 m depending on discharge). The sonar workflow (multibeam) is the primary method for structural capture. ROV optics are complementary for detailed findings and damage-pattern documentation, deployed with strong LED lighting. Deployment coordination with the shipping administration is mandatory.
Water Conditions and Deployment Depths at the Danube
Unlike a lake, a river has no uniform depth — deployment planning depends on the respective structure and the current discharge and flow conditions.
Typical depths
Bridge-pier foundations stand at 8 to 25 m water depth, depending on the structure and bed level.
Flow and water turbidity
Danube water is typically turbid (visibility 0.2 to 0.8 m depending on discharge). The sonar workflow (multibeam) is therefore the primary method for structural capture.
Exact water levels, flow conditions and visibilities vary depending on discharge, season and hydropower operation. For projects with accuracy requirements we coordinate the current situation in advance with the operator or the water-management authority.
Survey & Mapping at the Danube
Beyond pure condition inspection, hydropower operators, waterway administrations and port operators at the Danube are increasingly asking for geometric data — for example for scour-depth surveying at bridge piers, bed-profile mapping in harbour basins and lock forebays, or the as-built documentation of groyne heads and sheet-pile structures. With Survey & Mapping, ScanSustain offers photogrammetric and multibeam-sonar-based capture that delivers depth profiles, site plans and 3D models in CAD/GIS-ready formats.
At the Danube, the typically turbid water regime (visibility 0.2 to 0.8 m) requires the multibeam-sonar workflow as the primary method for geometric capture too — photogrammetric imagery complements this under better visibility conditions at close range. This combination is particularly relevant for bridge piers, groyne heads and port facilities when a geometric baseline is needed for rehabilitation or monitoring.
Regional Authorities and Bodies
Danube as an international waterway. In Bavaria: Waterways and Shipping Office (WSA) Regensburg. In Austria: viadonau (Austrian Waterways Company) and the BMK. Hydropower operator: Verbund Hydro Power. Ports in Linz and Vienna as separate administrative units.
Frequently Asked Questions
Does shipping have to be closed for an ROV inspection?
No. ROV deployments are coordinated with the waterway administration. At locks and weirs a coordinated closure or standstill phase is required. At bridges, groynes and harbour-basin areas without immediate structural closure, deployments usually take place during ongoing shipping operations.
How does ROV inspection work in turbid Danube water?
Optics-based detailed findings are captured with LED lighting at close range. Structural capture is sonar-based (multibeam for 3D survey and area findings).
What travel time is typical?
Danube section Passau to Linz: 1–1.5 hours' travel. Danube section Linz to Krems: 2–3 hours. Vienna region: 3–4 hours.
Does ScanSustain also offer survey and 3D mapping at the Danube?
Yes, as part of Survey & Mapping — currently as a pilot service, with photogrammetric and multibeam-sonar-based capture for depth profiles, site plans and 3D models in CAD/GIS-ready formats.
Does an ROV deployment at the Danube require official approval?
As a rule, yes. On the Bavarian side, the Waterways and Shipping Office (WSA) Regensburg is responsible; in Austria, viadonau (Austrian Waterways Company) or the BMK. At hydropower facilities, coordination with the operator Verbund Hydro Power is additionally required.
How is scour at groynes and bridge piers captured?
The Danube is scour-active: downstream of groynes scour holes form up to 5 m below the bed, at bridge piers local scour with a depth extent relevant to structural stability. Structural capture is primarily sonar-based (multibeam), complemented by ROV optics for the detailed documentation of the damage pattern.
Plan a deployment at the Danube
Describe your use case — within 1 to 3 working days you will receive a concrete initial assessment with method selection and an effort indication.