This is the length from the intersection of the design water plane at the bow, to the intersection of the design water plane at the stern. Often, people use just LWL, but DWL is more specific.
Obu bubude obusuka ekudibaneni kwesakhiwo senqanawe lokudada ngomgca wamanzi kumphambili wenqanawe, ukuya ekudibaneni kwesakhiwo senqanaba lokudada ngomgca wamanzi kumva wenqanawe.