How will spring tides exacerbate East Coast flooding next week?

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Spring Tides Will Worsen East Coast Flooding by Hindering River Water Drainage

The anticipated spring tide phenomenon along the East Coast next week is expected to exacerbate the current flood situation by preventing river water from draining into the sea. This tidal event, occurring when the sun, Earth, and moon are aligned, results in higher high tides and lower low tides, which can significantly impact coastal and riverine areas already facing high water levels due to heavy rainfall. The increased sea levels during high tide will create a backflow effect, impeding the natural outflow of freshwater from rivers into the ocean.
Impact of Spring Tides on Drainage

Spring tides are astronomical tides that occur twice a month, during new and full moons, when the gravitational pull of both the sun and moon is combined. This alignment leads to an amplified tidal range. In the context of flooding, when river levels are already elevated due to monsoon rains, the higher sea levels associated with a spring tide will obstruct the discharge of this river water. Consequently, rivers will struggle to empty into the sea, leading to water accumulating inland and potentially causing further inundation or prolonging existing flood conditions.
Cumulative Effect with Heavy Rainfall

The exacerbation of flooding by spring tides is amplified when combined with sustained heavy rainfall, a characteristic of the current monsoon season affecting the East Coast. While heavy rainfall directly contributes to rising river levels, the subsequent spring tide acts as a barrier to the natural drainage system. This means that even if rainfall were to decrease, the elevated sea level during spring tides would continue to impede the outflow, making floodwaters recede much slower than they otherwise would.
Forecasted Worsening Flood Situation

This combination of factors has led to projections that the current floods could be more severe than the 2014 disaster. The Meteorological Department of Malaysia's forecasts, as indicated by Deputy Prime Minister Datuk Seri Ahmad Zahid Hamidi, highlight the significant impact of the upcoming spring tide. This natural phenomenon, therefore, plays a critical role in the worsening flood outlook for states like Kelantan and Terengganu, and potentially impacting Pahang and Johor in early December.

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How will spring tides exacerbate East Coast flooding next week?

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