- 4x Gearbox with an age of about 20 years
- Oil volume in the gearbox
- Cycle every 2 hours
- Influence of sun and weather indirectly present
- Long downtimes, less frequent operation
Weir systems provide sufficient water depth in rivers and canals to allow shipping. Furthermore, weirs allow a slower flow rate of the water, which makes riverbeds and bridge piers less flushed or undermined.