Day, time and draft to proceed to the berths in the river Seine mainly depend on the level of the tides, the weather conditions, soundings in the river and along quays, maneuvring speed...
At the present time maximum drafts are :
While spring tides the arrival of the flood current produce a bore named " Mascaret". Mascaret make the ship moving upstream. It is compulsory to get a good mooring and to keep all the lines very tied. For big ships and deep drafts it could be useful to use their engine. During upstream the pilots will give informations about the bore.
The ships can require a pilot for the bore. .