Water is admitted through valves (penstocks) until the level in the dock is the same as that outside; the entrance is then opened and the ship floated in.
Amanzi avumeleke ngezivalo (isivingco emjelweni wamanzi) de umgangatho edokisini ulingane nangaphandle, isango lokungena iyavulwa inqanawa idadele ngaphakathi.