Higher road will raise food levels in the city
The road is prone to flooding at high tide, but raising the level will only postpone future flooding there while increasing the probability and severity of flooding elsewhere in the city.
The answer to city flooding is to dredge the riverbed and then displace the water by depositing the silt on the estuary mudflats, reclaiming land to a level of at least two metres above the high tide level. If necessary the silt could be pumped behind an artificial barrier surrounding an enclosed mudflat.