--The number "0" or the "Sea Chart number 0 Depth" is above the prescribed standard, the depth of the sea. In Vietnam the standard water level is taken to coincide with the minimum water level of astronomical tides (water level the lowest net may occur).-The number "0" is the standard used to measure land elevations as the height of levees, dams, piers, ... Be taken to coincide with the average sea level for many years.-The number "0" State or the trigger called the number "0" is the National number "0" is taken as the standard level. Well Vietnam of "zero State" is taken to coincide with the average water level for many years in Hon Dau. So, Hon Dau number "0" Depth is lower than the number "0" State of about 1.9 m (1.86 m).
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