"Chinese cities are struggling with flooding in urban, concrete areas.
Sponge cities aim to capture and utilize this rainwater.
The formulation of government strategies is an important instrument to demonstrate political commitment to a transition towards more sustainable modes of operation.  Setting tangible and achievable targets within such strategies can engender focused action around particular strategic objectives. Furthermore, government strategies are invaluable tools to coordinate the implementation of an effectual mix of policy instruments, as well as facilitate the horizontal and vertical coordination of government.  Strategies can take a multi-dimensional, cross-sectoral or sectoral approach, as well as be integrated into existing planning. 
 OECD. 2011a. Tools For Delivering on Green Growth. Organisation for Economic Co-operation and Development. Available online via https://www.oecd.org/greengrowth/48012326.pdf
 Swanson, D.; Pintér, L.; Bregha, F.; Volkery, A. & Jacob, K. 2005. National Strategies for Sustainable Development: Challenges, Approaches and Innovations in Strategic and Co-ordinated Action. United Nations Division for Sustainable Development, International Institute for Sustainable Development, Stratos Inc. & Environmental Policy Research Centre, Frele Universität Berlin. Available online via: https://sustainabledevelopment.un.org/content/documents/1427crp_10.pdf