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2016/1/25
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CAN THO URBAN DEVELOPMENT AND RESILIENCE PROJECT1
Can Tho City
Phnom Penh
HCM City
EAST SEA
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WATER LEVEL RAISE IN CAN THO DURING LAST 40 YEARS
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Highest Water Level
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NASA JPL analysis of subsidence
Ground surface displacement measured with observations derived from radar data from Japanese ALOS-1 satellite
Red: uplift / Blue: subsidence: identifying subsidence as a key issue in the urban core and elsewhere
Linear average ground displacement rate estimated
(Jul 2007 – Jan 2011)
Land subsidence – a threat that requires further study
The Dutch Mekong Delta Plan identified land subsidence as a key challenge, caused by sustained, long-term drainage and groundwater extraction is occurring in the region
Can Tho authorities strongly believe that land subsidence is also threatening their city and, combined with sea-level rise, could lead to worsened seasonal flooding
The relationship among water supply, groundwater extraction, land subsidence, and flood protection is not well understood in Can Tho
FLOODING IN 1980(FROM HYDRAULIC MODELLING)
FLOODING IN 2011(FROM HYDRAULIC MODELLING)
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6/6/2015
6/6/20152011 2011
FLOODING SITUATION IN CAN THO CITY
• Flooding in rain season (from July to November), many areas are flooded from 0.3m – 1.0m,2000: 76% flooded area, mainly agricultural land (0.25 m – 1.5m)2011: 88% flooded area, including urban (20 – 50 cm)Urban: 2000/2765 flooded hectare (69%), 436,000 affected peopleFlooding over 200 000 houses, 1234 schools, 4000 km traffic road in rural, 116 000 ha rice – crop and garden,
• Flooding in urban (>= 0.3 m for 30 minutes)10/2002: some road lines are flooded10/2007: 20 points10/2011: 56 points10/2012: 56 points10/2013: 59 points10/2014: 47 points
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Project’s components:
Comp. 1: Flood risk management and environmental sanitation,
Comp. 2: Urban corridor development,
Comp. 3: Spatial planning platform and financial and social protection instruments.
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Comp. 1: Flood risk management and environmental sanitation
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1. Can Tho River embankment, 2. Cai Son-Muong Khai canal
embankment, 3. Road CMT8-PR918 (dual
purposes),4. Rehabiliation of 14 inner canals
(15/20 km)5. Tidal gate/locks.6. Flooding PS, 7. Retention ponds (additional 2
ponds) 8. Subsidence Monitoring System
COMP. 1FLOOD RISK MANAGEMENT
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EXAMPLE OF FLIEXIBLE DESIGN
FOR RIVER EMBANKMENT
2030
2050
Soft ecological embankment (lakes and small canals)
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Comp. 2: Urban corridor development,
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1. Quang Trung Bridge – Module 2.
2. Tran Hoang Na Road&Bridge and parallel road.
3. Connecting road between CMT8 Road to 918 Provincial Road,
Example of Road link CMT8-ĐT918
COMP. 2URBAN CORRIDOR DEVELOPMENT
Comp. 3: Spatial planning platform and financial and social protection instruments
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1. Management and operation of the city’s general flood risk management system,
2. Spatial planning bases,3. Financial and social protection tools:
a. Disaster Responsive Safety net establishment,b. Social Assistant System
Climate Change
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HydrographyPopulation
Administrative
Security
DataExtraction Data Access
Mapping Applications
RemoteSensing
Data Resources (maintained by custodial agencies)
MoNRE Topographic
Catalogue
Ministry for Agriculture Provinces
Ministry for Transport
Petroleum Corporation
Academia
Metering Billing
UserInformation
Transportation
Browser Access(Landgate etc)
GISApplications
Third Party Applications
AgencyBusiness
Applications
ENABLING FRAMEWORKUrban Resilience Information Management System(Map Viewing Platform for decision making)
USERS
Data Collectors and Maintainers
Spatial Data Infrastructure
PolicyStandardsGovernance
Data and Technology
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Technology Infrastructure
A single point for user level applications to access spatial data held by many government agencies
Service Net
SGIP Services
Agency Data
User
Agency
Application
Agency
Application
Users and Application
Data
Connection
Middleware
Firewall
Access Services
Data Access System• Catalogue
searching• Viewing and
download• E-commerce• Data Security
Images courtesy Landgate
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1. An effective approach to adapt to climate change is for a City to invest in infrastructure with risk based approach the incorporates multiple sectors
2. Geospatial visualization of risk is critical to understand and manage the risk
3. In light of uncertainty related to sea level rise, storm surge, and subsidence, flexible solutions that can be adjusted/elevated over time
4. A combination of hard infrastructure and green solutions is often the most cost effective and efficient
5. Multi-use infrastructure can save significant financial resources
6. Protecting a small core urban area will promote densification, which will improve public transport and reduce water displacement
7. It is important to find solutions for those outside of the protected area, such as scalable safety nets for recovery assistance
Conclusions