In its latest Safety Digest, UK MAIB described a case of ship grounding in low tidal conditions, noting that, in exposed anchorages prone to tidal streams, a ship can remain safely at anchor only as long as there is sufficient scope on the cable and the anchor continues to hold.
The incident
In preparation for a short coastal passage, a small general cargo ship left its berth, in ballast, and proceeded to an anchorage approximately 1½nm offshore to layover for a few hours. Although the master was...
https://safety4sea.com/lessons-learned-dragging-anchor-in-tidal-stream/