Falling Amazon River Levels Drive up Manaus Container Surcharges
Low Amazon River levels force carriers to apply surcharges of up to $1,900, raising landed costs for Manaus shipments.
Terminal Draft Limits
Depth Boundary
Maximum allowable distance between the waterline and the bottom of a ship’s hull determines which loaded vessels can safely enter and berth at a specific port facility. Marine operations enforced by terminal draft limits establish maximum operational depths based on channel soundings and tide cycles. Terminal operators adjust maximum allowable vessel drafts continuously to prevent ship groundings in port approaches and along quay walls.
The boundary of these port constraints applies to the immediate berth pocket and access channel, ending where open ocean waters provide unrestricted navigation depths.
Clearance Margin
Port authorities specify minimum clearance margins between the lowest point of a vessel hull and the sea floor to account for wave action and water density variations. When silting reduces channel depths, port captains reduce allowable vessel operating drafts, forcing incoming ships to discharge cargo at anchorage or reduce loading at origin ports. Vessel masters calculate dynamic draft using real-time tidal data and water salinity readings before entering restricted harbor channels.
Operating below required underkeel safety margins risks hull damage and port channel blockage from grounding incidents.
Dredging Threshold
Terminal capacity recovers once maintenance dredging removes accumulated silt and restores designated harbor design depths. Port authorities schedule periodic channel dredging to maintain published draft limits and accommodate modern deep-draft commercial cargo vessels.