Embracing Water – Thu Duc City Stormwater Management Strategy

Embracing Water – Thu Duc City Stormwater Management Strategy

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Project Context

Thu Duc City was formed in 2019 through combining 3 districts of Ho Chi Minh City, with the aspiration to become the innovation and knowledge driver for Ho Chi Minh City and the wider region. However, the city is always at high risk of flooding which is caused by three main factors: extreme heavy rainfall, high tide, and upstream flood discharge. Under the impact of climate change, all three threats have increased in intensity over the years. 

Despite the strong impetus for urban development and growth, Thu Duc City faces a myriad of obstacles in the development and implementation of a comprehensive flood control strategy such as limited land for development, competing needs for funding, segregated land ownership and limited government capacity.

Vision

With its strategic location as the heart of the Southern Economic Region of Vietnam, Thu Duc City strives to be a creative, inclusive, and sustainable engine of growth, with comprehensive planning and design strategies that respond to its spatial conditions within the delta of the Saigon and Dong Nai rivers. 

With a thorough understanding of local constraints and a comprehensive flood resilience strategy, we envision a resilient delta city that embraces water in its development pathway. enCity proposes a four-step strategy of localise – protect – adapt – mitigate to leverage local assets and address context-specific constraints. 

enCity’s Strategies

1. Localise flood management to maximise resilience 

Based on the analysis of natural topographical features, existing infrastructure, ecological system, local budget and development orientation, the city is divided into 10 main catchments and 170 sub-catchments. This facilitates the selection of priority areas for flood control investment with limited budgets while ensuring ecosystem conservation through the separation of wetland areas to have their own behavioral solutions.

2. Protect communities from rising water 

Because many communities and urban settlements already exist along rivers, protection methods are most feasible and effective when they consider local context, both availability of land or communities’ acceptance. The flood corridors enable the integration of other infrastructures into flood protection such as roads, ground leveling, and tidal walls, reducing costs and enabling partnerships between public and private actors.

3. Adapt green infrastructures for emergencies 

Mobilization of assets beyond hard infrastructure becomes relevant in periods of heavy rain, when the water level of the river rises and excess water within sub-catchment areas cannot be drained out. To address this, the adaptation layer is a combination of both centralised and decentralised measures, to retain and detain the storm-water runoff. They are operating at all scales from the city (central parks and waterways) to the plot (playgrounds and fields) to individual buildings (green roofs).

4. Mitigate damage in emergencies 

A holistic plan is one that prepares for system failure and disaster situations. Flood protection systems are costly and government budgets are limited. In response to structural failures caused by potential flooding events that exceed the design frequency, planning evacuation and rescue systems integrated within existing infrastructure systems can mitigate the worst damage and smoothen the recovery process.

Services offered: Hydrological modeling, water management strategic development, land use planning, infrastructure planning

Source: Dantri
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With a thorough understanding of local constraints and a comprehensive flood resilience strategy, we envision a resilient delta city that embraces water in its development pathway. enCity proposes a four-step strategy of localise - protect - adapt - mitigate to leverage local assets and address context-specific constraints.

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