Implementing nature- based flood protection Principles and implementation guidance ©2017 The World Bank The International Bank for Reconstruction and Development The World Bank Group 1818 H Street, NW List of acronyms Washington, D.C. 20433, USA CEDA Central Dredging Association Internet: www.worldbank.org DHI Danish Hydraulic Institute This work, including this document and the nature-based solutions online Fondazione Eni Enrico Mattei platform, was co-financed by the Program on Forests (PROFOR), the Global FEEM Facility for Disaster Reduction and Recovery (GFDRR), and Deltares. FRM Flood Risk Management The online platform that provides up-to-date implementation guidance GCCA+ Global Climate Change Alliance and a database of nature-based solutions projects can be accessed at: naturebasedsolutions.org GCF Green Climate Fund GEF Global Environment Facility Attribution Please cite the work as follows: World Bank. 2017. 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UNDP United Nations Development Photo credits Programme Building with Nature Indonesia is a program by Ecoshape partners and the Indonesian Ministry of Marine Affairs and Fisheries (MMAF), and the UNEP United Nations Environment Indonesian Ministry of Public Work and Human Settlement (PU) Programme University & Research Centre, UNESCO-IHE, Blue Forests, and Von UNISDR United Nations Office for Disaster Lieberman, with support from the Diponegoro University, and local Risk Reduction communities; p4, p5, p6, p17, p27 and p30 United Nations University Adobestock; p18 and p31 UNU Stefan Verschure; p6 and p7 USACE U.S. Army Corps of Engineers Thinckstock; cover and p8, p20, p23, p28 Clipart Panda; p10 VIA Vulnerability Impact Assessment Guus Schooneville; p12 World Business Council for Van beek images.com; p14 and p25 WBCSD Sustainable Development WRI World Resources Institute Implementing nature- based flood protection Principles and implementation guidance Acknowledgements This guideline is a product of collective effort by Deltares, the Global Facility for Disaster Reduction and Recovery (GFDRR), the Program for Forests (PROFOR) at the World Bank, Ecoshape, and the United Nations Development Programme (UNDP). Furthermore, this document could not have been made without the input from all participants of the workshop on scaling up nature-based flood risk reduction, held on April 11th and 12th 2017 at Deltares (NL). Authors: Deltares: Bregje K. van Wesenbeeck, Stéphanie IJff GFDRR: Brenden Jongman, Simone Balog , Stefanie Kaupa, Lauren Bosche World Bank: Glenn-Marie Lange, Niels Holm-Nielsen Ecoshape: Henk Nieboer UNDP: Yusuke Taishi, Pradeep Kurukulasuriya Independent consultant: Imen Meliane Contributors and reviewers: The Water Institute of the Gulf: Denise Reed HR Wallingford: Jonathan Simm US Army Corps of Engineers: Todd S. Bridges Deltares: Stephanie Janssen, Karen Meijer IH Cantabria: Inigo Losada The Nature Conservancy & University of California, Santa Cruz: Borja G. Reguero Royal Haskoning-DHV: Petra Dankers The Nature Conservancy: Adam Whelchel Wetlands International: Marie-Jose Vervest, Susanna Tol Environmental Defense Fund: Natalie Peyronnin, Shannon Cunniff University of Western Australia: Ryan Lowe Delft University of Technology: Stefan Aarninkhof UN Environment/IUCN CEM: Karen Sudmeier UN Environment: Marisol Estrella UNU Institute for Environment and Human Security: Fabrice Renaud Design and Layout: Deltares: Welmoed Jilderda This document is drafted based upon comments and remarks from the following workshop participants: Name Organisation Abdi Yusuf United Nations Development Programme (UNDP) Ap van Dongeren Deltares Armando Guzman The World Bank Bastiaan Lammers Boskalis Bontje Zaengerling The World Bank Boris van Zanten Wolfs Company Carrie de Wilde Ecoshape Cees van de Guchte Deltares Christophe Briere Deltares Claire Jeuken Deltares Ellis Penning Deltares Els van Lavieren Conservation International Femke Schasfoort Deltares Fokko van der Goot Ecoshape Hans Pietersen Rijkswaterstaat Hessel Winsemius Deltares Jaap Kwadijk Deltares Jaap van Thiel de Vries Boskalis Luca Sittoni Ecoshape Madhuvi Kisoen Ministry of Public Works Suriname Marcel Stive Delft University of Technology Mary Bryant US Army Corps of Engineers Mathias Bertram Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) Mathijs van Ledden GFDRR Melisa October Ministry of Agriculture, Guyana Mindert de Vries Deltares Minke van Rees Turing Foundation Monica Altamirano Deltares Natasja van den Berg Tertium Nicolas Desramaut The World Bank Nigel Pontee Halcrow Group Ltd Dionisio Perez Blanco Fondazione Eni Enrico Mattei (FEEM) Peter Goodwin University of Idaho Pieter van Eijk Wetlands International Quirijn Lodder Rijkswaterstaat Remment ter Hofstede Van Oord Robert McCall Deltares Salah Dahir United Nations Development Programme (UNDP) Saskia Marijnissen United Nations Development Programme (UNDP) Stefan Aarninkhof Delft University of Technology Susanna Tol Wetlands International Vincent Vuik Delft University of Technology Drone picture of Demak showing Wouter Gotje Witteveen + Bos sediment accumulation behind permeable grids 1INTRODUCTION 1 IntroductionFloods are the most frequent and damaging of all natural hazards globally. Between 1994 and 2013, floods accounted for 43% of all recorded natural events, affecting nearly 2.5 billion people1. During exceptional years such as 1998 and 2010, total losses due to flooding have exceeded $40 billion. In the coming decades with climate change, urbanization, and demographic growth, the impact of coastal, fluvial, and pluvial flooding is expected to increase significantly. Effective flood risk management is critical to protect people and their livelihoods from flooding and to limit future losses. Nature- based measures and their ability to address flood risk are receiving increasing attention. Failing sea wall 6 Implementing nature-based flood protection I Principles and implementation guidance Until recently, most flood risk management involved implemented on an ad-hoc basis. While there have conventional engineering measures. These measures are been significant advances in the design and testing sometimes referred to as “hard” engineering or “gray” protocols for ecosystems and their role in risk mitigation, infrastructure. Examples include building embankments, these solutions have yet to be fully evaluated and dams, levees, and channels to control flooding. Recently standardized. As a result, some nature-based projects the concept of “nature-based solutions”, “ecosystem- for climate adaptation and disaster risk reduction have based adaptation”, “eco-DRR” or “green infrastructure” not been designed properly, leading to ineffective and has emerged as a good alternative or complement to unsustainable results. As is the case for engineering traditional gray approaches. Nature-based solutions solutions, there is no ‘one size fits all’ approach given make use of natural processes and ecosystem services that climatic, ecological, and hazard characteristics are for functional purposes, such as decreasing flood risk variable and are often poorly understood. However, or improving water quality. These interventions can be the sector of traditional infrastructure has a long completely “green” (i.e. consisting of only ecosystem history in which they have fully developed protocols elements) or “hybrid” (i.e. a combination of ecosystem and standards, whereas nature-based solutions are elements and hard engineering approaches). emerging approaches that