A hatch is fitted with a coaming to prevent flood water from flowing below, and a lid called a hatch cover is hinged to it .
Isivalo sifakelwe nomphetho ophakamileyo wokunqanda amanzi angangeni emngxunyeni ekulayishwa ngayo inqanawa ukunqanda amanzi angaphuphumali ngaphantsi, kwaye isiciko esibizwa ngokuba sisigqubuthelo sesivalo sixonyezelelwe kuwo.