The Changjiang River is the major source of surface water in Zhenjiang New Area. The water system belongs to tidal reach. The tide rises and falls twice a day with an average time-lapse of 3 hours and 25 minutes.

1　Water level and tidal range
　Highest flood stage in history: 6.69m(Huanghai height, the same 　below)
　(recorded in 1996)
　Lowest water level: -0.65m
　Average flood stage: 5.20m
　Average low water level: 0.06m
　Maximum tidal range in history: 2.10m
　Minimum tidal range in history: 0.01m
　Average tidal level: 0.96m
2 Current velocity
　Maximum velocity: 2.00m/s ( flood period)
　Minimum velocity: 0.50m/s (drought period)
　Average velocity: 1.00m/s (medium water level)
3 Rate of flow
　Maximum peak discharge: 92600m /s³ ( recorded on August 1, 1954 )
　Maximum average rate of flow: 43100m ³ /s (1954)
　Average rate of flow over the years: 28600m 3 /s
　Minimum average rate of flow: 21400m ³ /s
　Minimum rate of flow in drought period: 4620m ³ /s
　Average annual runoff: 893.3 billion m ³