Nha Trang Residents Rush Cars to Overpasses as Authorities Announce Major Reservoir Water Discharges Amid Flood Concerns

The coastal city of Nha Trang is on high alert as local authorities prepare for extensive water discharges from major upstream reservoirs, prompting anxious residents to relocate their vehicles to elevated infrastructure to prevent catastrophic flood damage reminiscent of previous historical disasters.

The emergency measures began late on November 10, following official announcements that several key reservoirs would actively regulate and release water starting early the following morning. Memories of the devastating historic floods of 2025 remain raw among local motorists, particularly in low-lying districts such as West Nha Trang, where hundreds of cars were previously submerged and severely damaged. Determined to avoid a repeat of those costly losses, residents mobilized en masse under the cover of night, creating long, bumper-to-bumper lines of vehicles parked securely across elevated bridges and raised roadways.

Mass Relocation of Vehicles to Elevated Infrastructure

By 9:00 PM on November 10, the migration of personal vehicles to higher ground was in full swing. Motorists packed the railway overpass crossing Vo Nguyen Giap Street in West Nha Trang, with cars parked tightly along both sides of the road for hundreds of meters. A similar scene unfolded nearby along To Huu Street in South Nha Trang, where lanes were quickly saturated with vehicles left by owners seeking safety from potential rising waters.

Tran Huu Tien, a 38-year-old resident living in the Vinh Diem Trung urban area of West Nha Trang, explained that his family learned hard lessons during the severe flooding the previous year. Having suffered significant stress and financial strain when water nearly swallowed his vehicles, Tien took proactive steps this time.

"Recalling the sight of submerged cars last year is still too terrifying, so this time we had to bring our vehicles to safety early to avoid being trapped," Tien said.

Echoing this sentiment, Le Hoi Trang, a 36-year-old resident from West Nha Trang, described the psychological toll of the previous weather event. "Thinking back to last year, watching my property sink into a sea of water while feeling completely helpless was heartbreaking. This year, I decided to move the cars up to the railway overpass early to escape the floodwaters."

Reservoir Operations and Scheduled Discharges

The mass mobilization of residents was triggered by formal notifications issued late in the afternoon by the Khanh Hoa Irrigation Works Exploitation One Member Co. Ltd. According to the company’s operational schedule, multiple regional reservoirs—including Suoi Dau, Dac Loc, and Cay Sung—are slated to begin controlled water releases starting at 7:00 AM on November 11, with discharges projected to continue through November 16.

The Suoi Dau reservoir management plan outlines a regulated discharge period spanning from November 11 to November 16, maintaining controlled outflow rates ranging from a minimum of 5 cubic meters per second up to a maximum of 60 cubic meters per second. Similarly, the Dac Loc reservoir will discharge water between 3 and 15 cubic meters per second over the same five-day window. The Cay Sung reservoir will implement modest discharges ranging from 1 to 10 cubic meters per second through November 16.

While these controlled releases are standard engineering procedures designed to protect structural integrity during heavy rainfall and manage incoming basin water volumes, operational agencies warned that the combination of reservoir discharges, ongoing heavy precipitation outside the catchment areas, and high coastal tides could sharply elevate water levels.

Risk Assessment and Vulnerable Zones

Meteorological and hydrological forecasting models indicate that the coordinated water releases, when compounded by external runoff and tidal dynamics, pose a significant risk of localized, flash-type flooding. Authorities have highlighted specific vulnerable areas that require immediate vigilance.

The high-risk zones encompass riverine settlements along the Suoi Dau River, spanning Suoi Dau Commune, Cam Lam, Suoi Hiep, Dien Loc, and Dien Khanh. Additionally, low-lying residential sectors situated along the Cai River in Nha Trang—particularly within West Nha Trang and North Nha Trang—face heightened exposure to rising water levels. Local disaster management committees have urged residents in these sectors to monitor official weather bulletins continuously and prepare for potential emergency evacuations if conditions deteriorate.

Contextualizing Urban Vulnerability and Infrastructure

The frantic scramble to secure vehicles highlights a broader, systemic vulnerability within rapidly developing coastal and river-adjacent urban centers in central Vietnam. As regional climate patterns grow increasingly volatile, intense precipitation events frequently overwhelm traditional drainage systems, turning urban thoroughfares into rapid torrents within hours.

Automobiles represent one of the most substantial household investments outside of real estate, making vehicular protection a top priority for middle-class urban families. The widespread utilization of public infrastructure—such as railway overpasses and elevated highway interchanges—as impromptu parking structures illustrates both the ingenuity of local communities under duress and the critical need for resilient urban planning that accounts for extreme weather contingencies.

Municipal authorities and transportation police have maintained a visible presence along the improvised parking zones to manage traffic flow, prevent bottlenecks, and ensure that emergency service vehicles retain unobstructed passage. At the same time, community networks have mobilized digitally, sharing real-time updates regarding parking availability on elevated structures and water level progression across municipal monitoring stations.

Broader Economic and Environmental Implications

The ongoing weather emergency underscores the delicate balance water resource managers must maintain in central Vietnam during the peak monsoon season. Reservoirs like Suoi Dau and Dac Loc serve vital dual purposes: storing essential water resources for agricultural irrigation during dry periods and absorbing heavy flood surges during tropical depressions and typhoons.

However, when consecutive extreme weather events saturate regional watersheds, reservoir capacities reach critical thresholds, forcing operators to execute regulated discharges to prevent catastrophic dam failures. While these controlled releases mitigate the existential threat of structural collapse, they invariably transfer downstream flood risks to urban centers and agricultural plains, necessitating timely early-warning systems and robust civic preparedness.

As the discharge schedule progresses through the week, municipal authorities in Nha Trang remain on high alert. Emergency response teams, search-and-rescue units, and local administrative bodies have been placed on standby to assist residents in vulnerable zones. For the people of Nha Trang, the immediate focus remains on weathering the current hydrological challenge while hoping that infrastructure investments and improved early warnings will mitigate the long-term impacts of seasonal extreme weather.