MHHW

– Mean Higher High Water (MHHW) is a statistical tidal datum calculated using the highest water surface elevation of each day, typically over a 19-year recording period.

MHW

– Mean High Water (MHW) is a statistical tidal datum calculated using the highest water surface elevation of each tidal period, typically over a 19-year recording period.

MLLW

– Mean Lower Low Water (MLLW) is a statistical tidal datum calculated using the lowest water surface elevation of each day, typically over a 19-year recording period.

MLW

– Mean Low Water (MLW) is a statistical tidal datum calculated using the lowest water surface elevation of each tidal period, typically over a 19-year recording period.

Morphology

– The evolution of the form of a river, estuary, seafloor, or other landform over time.

MSL

– Mean Sea Level (MSL) is a statistical tidal datum calculated using hourly water surface elevation values, typically over a 19-year recording period.