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  Services » Regional Services » Regional hazards and emergency management » Coastal hazards including tsunami » Coastal flooding » Coastal inundation tool » Pre-defined water level scenarios » WC

West Coast levels

Mokau RiverWaikato River,  Raglan HarbourMarokopa River,  Kawhia Harbour

 

Waikato River

Water level scenario Water level
RL - m
(MVD-53)
Present day MHWS (m) 1.69
Max tide (m) 2.02
Storm tide range (estimate) Lower (m) 2.23
Upper (m) 3.08
Future projected 0.5m projected  sea level rise MHWS (m) 2.19
Max tide (m) 2.52
Storm tide range Lower (m) 2.73
Upper (m) 3.58
1.0m projected sea level rise MHWS (m)   2.69
Max tide (m)   3.02
Storm tide range Lower (m) 3.23
Upper (m) 4.08

 

Raglan Harbour

Water level scenario Water level
RL - m
(MVD-53)
Present day MHWS (m) 1.72
Max tide (m) 2.06
Storm tide range (estimate) Lower (m) 2.26
Upper (m) 3.12
Future projected 0.5m projected  sea level rise MHWS (m) 2.22
Max tide (m) 2.56
Storm tide range Lower (m) 2.76
Upper (m) 3.62
1.0m projected sea level rise MHWS (m)   2.72
Max tide (m)   3.06
Storm tide range Lower (m) 3.26
Upper (m) 4.12

 

Aotea Harbour

Water level scenario Water level
RL - m
(MVD-53)
Present day MHWS (m) 1.73
Max tide (m) 2.07
Storm tide range (estimate) Lower (m) 2.27
Upper (m) 3.13
Future projected 0.5m projected  sea level rise MHWS (m) 2.23
Max tide (m) 2.57
Storm tide range Lower (m) 2.77
Upper (m) 3.63
1.0m projected sea level rise MHWS (m)   2.73
Max tide (m)   3.07
Storm tide range Lower (m) 3.27
Upper (m) 4.13

 

Kawhia Harbour

Water level scenario Water level
RL - m
(MVD-53)
Present day MHWS (m) 1.74
Max tide (m) 2.08
Storm tide range (estimate) Lower (m) 2.28
Upper (m) 3.14
Future projected 0.5m projected  sea level rise MHWS (m) 2.24
Max tide (m) 2.58
Storm tide range Lower (m) 2.78
Upper (m) 3.64
1.0m projected sea level rise MHWS (m)   2.74
Max tide (m)   3.08
Storm tide range Lower (m) 3.28
Upper (m) 4.14

 

Marokopa River

Water level scenario Water level
RL - m
(MVD-53)
Present day MHWS (m) 1.76
Max tide (m) 2.10
Storm tide range (estimate) Lower (m) 2.30
Upper (m) 3.16
Future projected 0.5m projected  sea level rise MHWS (m) 2.26
Max tide (m) 2.60
Storm tide range Lower (m) 2.80
Upper (m) 3.66
1.0m projected sea level rise MHWS (m)   2.67
Max tide (m)   3.10
Storm tide range Lower (m) 3.30
Upper (m) 4.16

 

Mokau River

Water level scenario Water level
RL - m
(MVD-53)
Present day MHWS (m) 1.82
Max tide (m) 2.17
Storm tide range (estimate) Lower (m) 2.36
Upper (m) 3.23
Future projected 0.5m projected  sea level rise MHWS (m) 2.32
Max tide (m) 2.67
Storm tide range Lower (m) 2.86
Upper (m) 3.73
1.0m projected sea level rise MHWS (m)   2.82
Max tide (m)   3.17
Storm tide range Lower (m) 3.36
Upper (m) 4.23

 

Glossary of definitions

Sea level anomaly: Variations in sea levels from a long term ‘mean sea level’ that are not due to tides, effects of storm surge or waves are termed an ‘anomaly’. The variations in sea level along the coast are due primarily to changes in water temperature and wind patterns.

As water gets warmer it expands and sea levels rise. Persistent winds can also ‘push’ water towards the coast (increasing sea levels) or away from the coast (decreasing sea levels). The sea level variations occur at time periods over a year (seasonal changes), several years (El Niño and La Nina Climate Cycles) and over decades (Pacific Decadal Oscillation). 

Therefore, while tide levels can be accurately predicted, the actual sea level at any given location is likely to differ from the predicted tide.

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