Urban Drainage Adaption of drainage to CC

 

Viet Nam cities have experienced a significant rise in flooding issues the last years - this is generally attributed to urbanization and climate change. More intense and frequent rainfall events, together with urban development, oblige cities to be more conscious of how they manage drainage systems and runoff. The challenges these cities face is, how to better adapt their drainage systems for the effects of climate change. 

The projects approach, does not only look at drainage planning in terms of drainage systems, but integrates drainage planning with less technical elements by managing rainwater before it enters the drainage pipes. It also advocates broad base participation, fosters leadership of key stakeholders and emphasizes capacity building for an integrated approach to drainage planning.

In Viet Nam, drainage systems are developed with the purpose of evacuating rain as quickly as possible to avoid flood. They use an underground system of drainage pipes with sufficient draining capacity, pumping stations and storage reservoirs. These systems have high initial costs and a long lifespan (50-80 years). However in a changing environment (climate change & urbanization) these systems are quite inflexible and adaption is either not possible, or very expensive.  

To reduce hydrological stress and better adapt existing drainage to climate change; alternative systems can be used. With a more integrated and flexible design, these techniques use natural and man-made infiltration and storage techniques to manage water on the land surface. For example: swales, permeable pavements, green/blue roofs, wetlands, temporary storage lakes and rain gardens all manage water, treat it while at the same time reduce pressure on drainage systems. Such alternative systems are adaptable for the uncertain effects of climate change and economically more sustainable in the long run as they are not fixed a permanent infrastructure like underground pipes.

 

 How are we active in this field?

Our efforts encompass many activities in the area of drainage planning and adaptation to climate change for the selected medium-sized coastal cities of Soc Trang, Nha Trang, Tuy Hoa, Quy Nhon and Quang Ngai.

Some activities include:

  • Hydrological modeling of performance of existing and planned drainage systems 
  • Collaboration with provincial partners on technical recommendations for improving existing systems and measures for adaptation to climate change
  • Capacity building in competencies in Urban Hydrology & Climate Change and Designing Sustainable Urban Drainage Systems
  • Awareness raising about alternative drainage measures for adaption to climate change
  • Collaboration with national partners on supporting legal framework and policy recommendations in the urban drainage secto

 

 

Urban Drainage

  • Published on Jan 06, 2014

Adaption of drainage to CC

 

Viet Nam cities have experienced a significant rise in flooding issues the last years - this is generally attributed to urbanization and climate change. More intense and frequent rainfall events, together with urban development, oblige cities to be more conscious of how they manage drainage systems and runoff. The challenges these cities face is, how to better adapt their drainage systems for the effects of climate change. 

The projects approach, does not only look at drainage planning in terms of drainage systems, but integrates drainage planning with less technical elements by managing rainwater before it enters the drainage pipes. It also advocates broad base participation, fosters leadership of key stakeholders and emphasizes capacity building for an integrated approach to drainage planning.

In Viet Nam, drainage systems are developed with the purpose of evacuating rain as quickly as possible to avoid flood. They use an underground system of drainage pipes with sufficient draining capacity, pumping stations and storage reservoirs. These systems have high initial costs and a long lifespan (50-80 years). However in a changing environment (climate change & urbanization) these systems are quite inflexible and adaption is either not possible, or very expensive.  

To reduce hydrological stress and better adapt existing drainage to climate change; alternative systems can be used. With a more integrated and flexible design, these techniques use natural and man-made infiltration and storage techniques to manage water on the land surface. For example: swales, permeable pavements, green/blue roofs, wetlands, temporary storage lakes and rain gardens all manage water, treat it while at the same time reduce pressure on drainage systems. Such alternative systems are adaptable for the uncertain effects of climate change and economically more sustainable in the long run as they are not fixed a permanent infrastructure like underground pipes.

 

 How are we active in this field?

Our efforts encompass many activities in the area of drainage planning and adaptation to climate change for the selected medium-sized coastal cities of Soc Trang, Nha Trang, Tuy Hoa, Quy Nhon and Quang Ngai.

Some activities include:

  • Hydrological modeling of performance of existing and planned drainage systems 
  • Collaboration with provincial partners on technical recommendations for improving existing systems and measures for adaptation to climate change
  • Capacity building in competencies in Urban Hydrology & Climate Change and Designing Sustainable Urban Drainage Systems
  • Awareness raising about alternative drainage measures for adaption to climate change
  • Collaboration with national partners on supporting legal framework and policy recommendations in the urban drainage secto