ISO 4375:2014

Overview - ISO 4375:2014 (Hydrometry - Cableway systems for stream gauging)

ISO 4375:2014 defines requirements for the design, components, anchorage, supports and accessories of cableway systems used specifically for stream gauging. It covers systems operated from the river bank (bankside instrument carriage) and systems using a suspended personnel carriage (cable car). The standard applies only to cableways used for hydrometric measurements and notes that additional lifting‑equipment or passenger‑cableway regulations may apply where certification is required.

Key topics and technical requirements

• System elements: towers/supports, main track or main cable, anchorage, backstays, suspension cable, tow (traversing) cable, instrument carriage, personnel carriage, winches, lightning protection.
• Safety factors (FoS): explicit minimum FoS values are given for critical cables:
  • Suspension cable: FoS = 5 (relative to maximum authorized suspended load)
  • Tow (traversing) cable: FoS = 1.25 (relative to breaking load of suspension cable)
  • Track/main cable: FoS = 2 (bankside instrument carriage) or FoS = 5 (suspended personnel carriage)
• Winch arrangements: configurations for double-drum or single-drum winches, requirements for traversing and sounding functions, and mounting strength (winch and mountings must accommodate specified breaking loads).
• Functional design: selection and specification of cables, carriage design, anchorage and foundation considerations, and provisions for electrical insulation/signal conductors in suspension cable.
• Maintenance and testing: requirements for routine inspection, static testing, lubrication, and sag checking to ensure continued safe operation.
• Operational safety: guidance on access/approaches, lightning protection, and additional safety requirements when personnel carriages are used (must meet passenger‑cableway safety standards where applicable).
• Marking: cableways must be clearly marked with maximum authorized sounding weights and approved suspension cable specification.

Applications - who uses ISO 4375:2014

• Hydrologists and river gauging teams installing or operating cableway systems for discharge measurements
• Water-resources engineers, field technicians and instrumentation specialists specifying cableway components (cables, anchors, winches, carriages)
• Environmental and government agencies managing long-term gauging stations
• Consultants and contractors designing or certifying gauging installations
• Operators who must integrate safety, maintenance and inspection regimes into gauging programs

Related standards

• ISO 772 - Hydrometry: vocabulary and symbols (terms used)
• ISO 80000-4 - Quantities and units (mechanics)
• ISO 748 - Methods for discharge measurement (note: ISO 4375 does not cover measurement techniques)
• National or regional standards/regulations for lifting equipment and passenger cableways where certification is required

ISO 4375:2014 is essential for safe, durable and compliant cableway installations used in stream gauging, supporting consistent hydrometric monitoring and reliable field operations.