Urban growth in and around VMD creates environmental stress through five simultaneous mechanisms: impervious surface expansion (reducing infiltration and increasing flood runoff), concentrated groundwater demand (deepening subsidence in city cores), waste heat effects on local microclimate, drainage infrastructure that accelerates runoff to rivers, and the demand for sand, fill, and construction materials that drives the extraction economy described above.

Can Tho — the delta's primary city at 1.3 million people — has seen tidal flooding frequency increase from roughly 2–3 events per year in the 1990s to 15–20+ events per year by the mid-2010s. This increase is not primarily driven by rising storm intensity, but by the compound effect of ~10–15 mm/year subsidence (lowering the city relative to tidal datum), impervious surface replacing previously absorptive paddy and wetland, and drainage channels that route runoff faster than the river-canal system can discharge it when tides are high. The city is now simultaneously sinking into the delta and receiving more water faster — a structural urban flood crisis that periodic dredging and pump-station installation cannot fully resolve without addressing the groundwater extraction that drives subsidence.

The HCMC metropolitan fringe deserves particular attention. Urban expansion across Bình Dương, Long An, and Tiền Giang is encroaching on areas that historically served as flood retention zones — the low-lying rice paddies and natural depressions that absorbed wet-season overflows from both the Đồng Nai and Mekong systems. As this retention capacity is paved over, the remaining channel network must convey higher peak flows, increasing backwater effects at the delta entrance and raising flood levels in the upper delta provinces.