Urban Flood Drainage Systems

Urban Flood Drainage Systems
ENTRY DATE: 21 April 2015| LAST UPDATE: 21 April 2015
Categories: Coastal Regions | Improvement of structures
Technological Maturity: Applicable immediately
Technology Owners:
  • Government e.g. In Bangladesh – Bangladesh Water Development Board
  • Private companies
  • NGOs
  • Community
  • Multilateral agencies e.g. Asian Development Bank funding and implementing drainage for climate adaptation in coastal towns of Bangladesh 
Needs Addressed

Measures flood remediation

Adaptation Effects
  • Reduced flood congestion and waterlogging
  • Reduced losses and damage
  • Increased mobility after flood/heavy rain
Overview and Features

Infrastructure for flood drainage urban environments after monsoonal or heavy rain or storm surges. This includes construction of new infrastructure and climate-proofing of existing infrastructure.

Cost

Construction of facility etc.

Energy Source

Fuel etc. for construction equipment

Ease of Maintenance
  • Requires regular maintenance for adequate functioning
  • Drains must be cleared from debris after flood events to unblock them from resulting debris
Technology Performance

Helps better preserve the urban infrastructure 

Considerations (technology transfer criteria, challenges, etc.)
  • Drainage systems require comprehensive planning processes that integrate future climate projections
  • Can be difficult to install in complex urban settlements, with need to address issues of existing infrastructure, land ownership, economic, social and political priorities 
Co-benefits, Suitability for Developing Countries
  • Improved health and sanitation in the urban environment
  • Reliance on old drainage facilities in developing countries is inadequate for increased frequency and extent of flooding
  • Unplanned urbanisation and settlement increases flash floods and increases drainage blockage and use and related sprawl can limit strategic planning, therefore these phenomena must be considered for implementing drainage systems
Examples
Information Resources

ADB.2011. Technical assistance Project- People’s Republic of Bangladesh: Strengthening the Resilience of the Urban Water Supply, Drainage, and Sanitation to Climate Change in Coastal Towns (Financed by the Japan Fund for Poverty Reduction). Available at: http://www.adb.org/sites/default/files/project-document/60695/45519-001-ban-tar.pdf [ 19 March 2015]

Chandrasena, D.C.N., Yusof, K.B.W. and Mustafa, M.R.U. 2014. Development of an Integrated Urban Drainage Cycle Management Model for City of Colombo. Available at: https://www.academia.edu/8374238/Development_of_an_Integrated_Urban_Drainage_Cycle_Management_Model_for_City_of_Colombo [04 December 2014]

Gajbhiye, K.N.D. Adapting to Climate Change in Asia’s Coastal Megacities. Available at: http://start.org/download/car-ppt/2-gajbhiye.pdf [ 19 March 2015]

The Connecting Delta Cities (CDC) network, N.d. Climate change Adaptation. Available at: http://www.deltacities.com/cities/singapore/climate-change-adaptation

[ 19 March 2015]

World Bank. 2011. Guide to Climate Change Adaptation in Cities. Available from: http://www.ppiaf.org/sites/ppiaf.org/files/publication/Urban_Handbook_Final.pdf [04 December 2014]