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This implementation guideline on water retention areas has been developed based on practical experiences of piloting Water Retention Areas in Dong Hoi city, Quang Binh province, Viet Nam. Introducing the water retention systems to the urban fabric potentially bestows multiple environmental, social and economic benefits, particularly in meeting the challenges presented by flooding. For example, bioretention areas can reduce surface runoff, the pavements effectively delay and reduce peak flows.

To implement effective water retention areas in Viet Nam, the following recommendations are being put forward: 

• Promote public policies (i.e. legal obligations, taxation incentives, financing support, etc.) and appropriate strategies at national and local levels 
• Stimulate knowledge sharing about the technical, environmental and social benefits 
• Identify key components of the available financing mechanisms to design attractive incentive programmes 
• Incorporate water retention areas in public projects to provide tangible examples and motivate private investors 
• Develop a database of technologies, products and service providers for each geographical and climate region 
• Promote enabling market conditions for green infrastructure industries 
• Enhance collaboration between scientists, policymakers and practitioners to promote knowledge transfer and implementation 
• Encourage the participation of urban residents to guarantee the successful implementation of water retention areas