Before revision: Mean low water spring Mean low water spring (MLWS) is the average of the water levels of each pair of successive low waters during that period of about 24 hours in each semi-lunation (approximately every 14 days), when the tidal range is greatest (spring range).Definitions of tidal terms, Land Information New ZealandDefinitions of various tide related terms, Proudman Oceanographic Laboratory.
After revision: Mean low water springs Mean low water springs (MLWS) is the average of the water levels of each pair of successive low waters during that period of about 24 hours in each semi-lunation (approximately every 14 days), when the tidal range is greatest (spring range).Definitions of tidal terms, Land Information New ZealandDefinitions of various tide related terms, Proudman Oceanographic Laboratory.