taisuke watanabe, japan international cooperation agency - urban flood control: the case of the...
Post on 16-Jul-2015
201 Views
Preview:
TRANSCRIPT
Toward Disaster & Climate Resilient, Toward Disaster & Climate Resilient, Sustainable CitiesSustainable Cities
─ Urban Flood Control and related tools── Urban Flood Control and related tools─
Taisuke WatanabeTaisuke WatanabeJapan International Cooperation AgencyJapan International Cooperation Agency
17 February 2015 @OECD Environet17 February 2015 @OECD EnvironetWatanabe.Taisuke@jica.gop.jpWatanabe.Taisuke@jica.gop.jp
1
Presentation Outline- Low priority on disaster risk reduction (DRR) while increasing vulnerability →Mainstreaming DRR- Flood Control Measures in Manila →Gap bet. DRR and Climate Change- Tools Win-Win Land use Eco-DRR
2
Increased vulnerability to Flood Risks in Urban Areas- Major Adaptation Challenge for Asian cities
Increased vulnerability to Flood Risks in Urban AreasHeavy Rainfall EventsRise in Groundwater LevelMultiple factors Related to Rapid Urbanization -More & faster water run-off-Habitation in high risk zones-Lack of measures
Adaptation measuresStructural MeasuresConstruction of Dikes, Improvement of Drainage, etc.Non-Structural Measures-Risk Mitigation Measures at Household/Community Levels-Early Warning and Evacuation System Appropriate City PlanningEnvironmental Management-Sewage System-Waste and Sanitary Management
Necessity of a ‘Long-term Resilient City Development Plan’
Necessity of a ‘Long-term Resilient City Development Plan’
There are many options for action.
Philippine National Climate Change Action Plan says;Adopt flood plain management and flood hazard reduction by establishing flood plain zones and new operating rules during flood periods as modular or incremental adaptation measure.
4
Actions in National Climate Change Plan
Urban Flood Control in Manila
Structural measures - Mangahan Floodway - Pasig-Marikina River Channel Improvement & others - Observation and Operation System
Non-Structural measures - Forecasting & Early Warning
Capacity Building - National Gov and Local Gov - Training, Guidelines - Planning works
Manila: Pasig-Marikina River Basin
Mangahan Floodway
Phase &Ⅱ Ⅲ PhaseⅢ
PhaseⅣ
Rosario Weir
Pasig-Marikina River Channel Improvement
7
・ O:Original PhaseIV Component ・ A:A+Hightenning Levee +Mangahan Floodway Improvement・ B:A+NRB+Additional Capacity
・ NRB +Additional Capacity
・ Dam+NRB・ Dam・ Dam+FCB
NRB: Natural Retarding BasinFCB : Flood Control Basin
Adaptation Measures for Climate ChangeStep Up Options of Adaptation Measures for Climate Change
・ Climate Change Adaptation Measures Options
• Preparing options based on existing plans and IPCC data
8
New Dam Construction
Securing of NRB/FCB Volume
Underground Floodway
Underground Storage Facility( Tunnel Storage)
Runoff Control Facilities
Estuary - MCGS MCGS-Sto.Nino
Dam flood control function Improvement
Sto.Nino
MF Capacity Improvement( Securing of cross-sectional area or Laguna Lake level lowering Measure Upstream of Sto.Nino
NRB/FCB flood control function Improvement
Win-Win setting by incorporating DRR component
Implementing Projects with DRR elements in Various Sectors
Thailand: Flood Resilient Subway
Philippines: Typhoon Resistant HospitalThailand: Raised Road
Raised 1m for flood mitigation
– Road Raising for Flood Mitigation– Typhoon Resistant Hospital– School-cum-Evacuation Center– Flood Resilient Subway System
9
Land Use: Setting River Boundary
Flood Risk Management Project for Cagayan de Oro River
Inundation Analysis/Inundation Risk
Assessment
Delineation of River Boundary/
Formulation of M/P
10
JICA supported the Philippines on;•Assessment of local evacuation capacity •Inundation analysis and risk assessment •Updating flood master plan
JICA supported the Philippines on;•Assessment of local evacuation capacity •Inundation analysis and risk assessment •Updating flood master plan
Land Use: Reconstruction planning after Haiyan
11
Political commitment on Typoon Yolanda (Haiyan): The government of Philippines sets “Build Back Better” as a basic concept for recovery and reconstruction by using the disaster as a trigger to realize disaster resilient societies.
Political commitment on Typoon Yolanda (Haiyan): The government of Philippines sets “Build Back Better” as a basic concept for recovery and reconstruction by using the disaster as a trigger to realize disaster resilient societies.
Concept for future Land Use Plan, “build back better”
12
No build zone40m
Controlled zone
New Plan
Road
Rai
sed
Sea
wal
l×
Secon
dary
Pro
tect
ion
Road
12
13
Sea wall
Secondary Protection Road
Controlled Zone
No Build Zone
Safe Zone
Project Scope was expanded for rehabilitation from Cyclone Nargis:Damage & recovery survey on the communitiesNew hazard map based on the satellite imagesCF extension & nursery centers rehabilitated with reinforcementRecovery survey of mangrove vegetation
Eco DRR Case : Myanmar- Cyclone Nargis
Integrated Mangrove Rehabilitation and Management through Community Participation in the Ayeyawady Delta
Hazard Map
14
Build Back Betterby Rehabilitation of Mangrove Forests
JICA Grant Aid Assistance (2012-2017)- Mangrove afforestation (1,154 ha) for enhancement of disaster reduction effects of mangrove ecosystem, validated / reaffirmed - including construction of a forest monitoring tower-cum-cyclone shelter / enhancement of participatory risk reduction training
15
Mangrove Reforestation(Jul, 2009)
View of Mangrove Nursery Bed Area (Jul, 2010)
Thank you!
16
top related