Optimal Investment Strategies to Minimize Flood Impact on Road Infrastructure Systems UK Team Prof Maria Paola Scaparra, Dr Trung Hieu Tran, Dr Siao-Leu Phouratsamay, Mr Graham Adutt, Ms Phuong Dang Vietnam team Chinh Ngo, Dr Hiep Nguyen, Dr Chung Pham, Mr Dang Quang Thinh @GCRF_OSIRIS GCRF.OSIRIS https://research.kent.ac.uk/gcrf-osiris/

Hanoi’s Recent Floods Vietnam 4th country globally for flood exposure 2016 2017 Problem exacerbated by: Aging drainage system Fast urbanisation Poor awareness Climate change 2018

Interdisciplinary Approach Impact Assessment Investment Programmes Review GIS-Based DSS Rainfall Simulation Flood Map Generation Optimal Schedule of Mitigation & Adaptation Actions

Flood Impact Assessment

Flood Impact Assessment Economic, social and environmental assessment Surveys conducted in 4 key districts of Hanoi city during 11 days Statistics using 497 surveys Residents and visitors (street vendors, taxi drivers) Gender dimension

Impact Assessment Findings

Investment Programme Review Hanoi drainage system master plan 2030-2050 Contains all the drainage system projects for Hanoi city until 2030 with a vision to 2050 Selection of 89 mitigation measure projects including: Rehabilitation of lakes Construction of new reservoirs Increasing the capacity of existing reservoirs Construction of manholes Information about budgets

Rainfall Simulation Simulate the extreme rainfall event at Hanoi in Oct-Nov 2008 Climate change scenario RCP8.5 (high CO2 emission) Return period of 20 and 100 years Temporal resolution (up to one minute) and spatial resolution (1x1km) Figure 1. The WRF model system (source: http://www2.mmm.ucar.edu). Figure 2. 24-h accumulated rainfall ending at 12:00UTC 31/10/2008.

Figure 3: Rainfall-runoff model Flood Map Generation A drainage network in Hanoi City (8 urban districts): 818 manholes (node) 939 sewers (link) with rectangular/circular shape 21 regulating lakes (basin) 9 outlets 6 pump stations with 29 units and 6 damper valves Based on the current traffic and topographic map, the study area is divided into 105 sub-basins (catchment). Figure 3: Rainfall-runoff model

Flood Map Generation Figure 4.1. Flooding map for Hanoi city with probability of 1% (return period of 100 years) on the present drainage system. Figure 4.2. Flooding map for Hanoi city with probability of 5% (return period of 20 years) on the present drainage system.

Investment Optimisation Model

Workshops ‘Operational Research – The Science that Solves Problems in Life’, Hanoi, 8 August 2018 Participants Ministry of Transport, Hanoi Urban Planning Institute Hanoi Sewerage and Drainage Limited Company Department of Construction, Department of Architecture and Planning Disaster Management Policy and Technology Centre University of Engineering and Technology, Hanoi National University Vietnam - Japan University, University of Transport and Communications NGOs (Project World Bank, Care International, Asian International, etc.) VTC 14 (Vietnam Television) Outputs: Ideas and data for the flood mitigation model Awareness about OR techniques potential Next workshop: Hanoi, May 2019 Present project research findings Disseminate results to other countries in Southeast Asia Establish regional network

Thank you! Global Challenges Research Fund: Cities & Infrastructure Project website: https://research.kent.ac.uk/gcrf-osiris/. Twitter: @GCRF_OSIRIS Global Challenges Research Fund: Cities & Infrastructure