Green, Smart and Resilient City: Approach to Urban Flood Management Vietnam disaster risk prevention aid system for urban flooding

1. Dr. Lee, Byoung Jae
Director of Urban Disaster Prevention & Water Resource Research Center

2. Background and Importance
Urban Flood Management Strategy
Disaster Risk Prevention Aid System for Urban Flooding
Ⅰ
Ⅱ
Ⅲ

3. Background and ImportanceⅠ.

4. 4
Background1
￭ Vietnam is pursuing an active response to climate change and sustainable
development as a national vision and requires the technology to support this.
￭ Increased demand is expected for the growing and increasingly diverse Vietnamese
industries that are related to an efficient response to climate change disasters
￭ Vietnam Disaster Preventive Urban Planning Frame is needed to manage the climate
change disaster risk relating to urban development and infrastructure construction

5. 5
Vietnam(VUPDA)-Korea(KRIHS) Joint Project2
￭ Demands of Vietnam using the outcomes of the urban flooding research (Korea Research
Institute for Human Settlements (KRIHS) over the past 3 years (2016-2018) )
- MOU between the KRIHS and VUPDA in 2012
- In July 2017, Vietnamese public officials and professors participated in
the ‘KOICA Climate Change Response Training Program’ hosted by the
Global Development Partnership Center (GDPC) of KRIHS.
- In December 2017, ‘A preliminary study for establishing climate change
response strategies for Vietnam’s local governments’ is conducted by
VUPDA with budgetary support from the GDPC of KRIHS
<KRIHS-VUPDA MOU(2012.5.18)>
< KOICA Training Program Vietnam Action Plan><2017 KOICA Climate Change Response Training Program> <KIRHS-VUPDA preliminary study >

6. 6
￭ Support to Vietnam through the differentiated analytical methods and expert personnel related
to disaster prevention that have been pushed forward by Korean urban planning.
< ‘(Heavy rain disaster) Urban planning support system and urban
planning information provision method’ patent >
- A patent has been registered for ‘(Heavy rain disaster) Urban planning support system and urban planning
information provision method’ as a result of R&D project performed by KRIHS from 2011 to 2016
- Also, KRIHS completed the development of ‘Support system for urban flooding prevention measures’ under its
own research budget. Currently, pilot projects are being applied to local governments such as Busan and Jeju.
< Support system for urban flooding prevention measures >
Disaster Risk Prevention Aid System for Urban Flooding
Korean Support System for Urban Flooding Prevention Measures
 Vietnam Disaster Risk Prevention Aid System for Urban Flooding

7. Urban Flood Management StrategyⅡ.

8. 8
 Comprehensive Disaster Prevention System needs to be constructed in which all
the constituents of a city respond in harmony to an impending disaster
< Measures for Disaster Prevention in Cities based on Disaster Size >
Basic Direction of Disaster Prevention against Climate Change1

9. 9
 Multi-Scale Disaster Vulnerability Analysis, Disaster Preventive Urban Planning

10. 10
< Comprehensive disaster vulnerability analysis process >
Current disaster vulnerability Future disaster vulnerability Future-new disaster vulnerable area
Comprehensive disaster vulnerability (draft) Comprehensive urban disaster vulnerability
1 2 3
4 5
 City-level comprehensive disaster vulnerability

11. 11
 What is PSR Strategy?
 Multilayered urban disaster prevention strategy that delays runoff of rainwater or stores it ‘’layer after
layer” taking characteristics of the scope of direct and indirect disaster influences into consideration
< PSR Strategy Concept >
P ★
S
RS
R
★
P
R
P
S
Grade1 Grade2 Grade3
R
S
P
Comprehensive Disaster Prevention System: PSR Strategy2

12. 12
 Illustration of PSR-based disaster reducing urban design techniques
1. Flood damage influencing area division 2. Land use arrangement
3. Disaster vulnerable area(S) measures 4. Urban responding area(R) measures
Low risk areas(R)
Medium risk
areas(S2)
High risk areas(S1)
Low Lands
High Lands
Medium risk
areas(S2)
Low risk areas(R)
Medium risk
areas(S2)
High risk areas(S1)
Construction of
Retention Facility
Elevation of Ground
Level / Buildings Resistant
to Flooding
Low risk areas(R)
Medium risk
areas(S2)
High risk areas(S1)
Residential Districts
Commercial Districts
Sports, Leisure Districts
Open Space
Road Drainage
Permeable Pavement
Wetlands
Green Roof
Rain Barrel
Temporary Retention Pond
Constant Retention Pond
Floodplain
Manmade Wetland

13. 13
▲Debris Barrier
Infiltration▼
◀Set Back
Set Back▶
▲Park
Ecological Pond
▼
▲
Open Space
▲Retention
◀ Retention
▼ Building Arrangement
▲
Buffer Green Belt
예상침수위
◀ Building Arrangement

14. Disaster Risk Prevention Aid System for Urban FloodingⅢ.

15. 15
Develop and distribute decision
support system technology
to support people who lack basic
knowledge of urban flooding and
disaster prevention
Goal of Project1
Final Outcomes
Basic data DB and policy application plan
for urban flooding analysis and management in Vietnam
Detailed risk information for the key urban flooding
management areas and determining the scope of authority
Support program for urban flood prevention measures
Systemization of Vietnam Urban
Flooding Vulnerability Analysis
Support for Vietnam Urban Flooding
Preventive Urban Planning
“ConstructionofVietnamDisasterRiskPreventionAidSystemforUrbanFlooding
toMaketheVietnamcitiesGreen,Smart,andResilient”

16. 16
 Simulation of the potential rise of rivers in rainfall scenario using HEC-RAS model(River flood)
 Simulation of overflow at each manhole site in rainfall scenario using SWMM model(Inland flood)
 Analyzing Urban flood
(Inland flood) Calculation of flow velocity and inundation depth
Using Two-Dimensional flow analysis (Song et al., 2016)
System Main Functions2

17. 17
 Making Inundation Map

18. 18
 Flood Risk-Based Zonning for Urban Areas
Classification
of zones
Accountability of
Prevention measures
Operational Definition
- Criterion (inland flood) at 1/30yr Condition
- Criterion (river flood) at 1/100yr Condition
Red Zone Compulsory
Places where heavy rainfall may cause very
serious impacts
Over 100cm
Orange Zone
Strongly
Encouraged
Places where heavy rainfall may cause
substantial impacts
50cm to 100cm
Yellow Zone Encouraged
Places where heavy rainfall may cause
noticeable impacts
10cm to 50cm
Green Zone Not considered
Places where heavy rainfall may not cause
noticeable impacts
Below 10cm
* In case that zones at 1/30yr and 1/100yr conditions are different from each other, the zone with the higher level is finally designated.
 The criteria on risk-based zoning were
selected in consideration of the risk
matrix presented in ‘ISO 31000 Risk
management’
M
S
T
H
K

19. 19
 Analyzing Social Dimensions of Flood Risks
 Developing a total of 11 type of maps
Public office
WatersupplyFac.
Educational Fac.
Road
Old&UndergroundBul.
Old Bui.
Underground Bui.
Total Bui.

20. 20
 Selection of High-Risk Areas
 Application of Multi-Criteria Decision Making(MCDM) technique
- Apply a total of 10 evaluation criteria (inland flood, river flood, population, land use etc.)

21. 21
 Support to establish disaster prevention measures
GAIA Plane Analysis Composition of disaster prevention measures for urban flooding Field Survey
Systemization of plan-based, facility-based, and management-based
measures in accordance with the risk-weightd cause
Reflect urban planning measures when designating disaster
prevention districts and establishing disaster prevention plans
- Social acceptability
- Economic efficiency
- Administrative burden
.
.
.
Vulerability (Building)
Exposure(Population)
Inland Flood

22. 22
 Main Functions Flow Summary

23. 23
 Disaster Risk Prevention Aid System for Urban Flooding Interface
Disaster Risk Prevention Aid System for Urban Flooding
· Developed to be easily accessible and used for disaster
prevention planning

24. 24
Expected Effects and Usage3
Demand for technology
• Practitioners and local governments in Vietnam that conduct urban flood vulnerability analysis
• Disaster prevention urban planning can be established for the creation of disaster-safe cities as it is possible to interact
with the practitioners and public officials on the analysis of existing flood vulnerabilities in Vietnam
• Service companies that analyze urban flood vulnerabilities and establish disaster prevention urban plans in Vietnam
• Main agents of the urban flood prevention urban development project in Vietnam (participation in projects related to
international organizations such as World Bank and ADB)
On site application
• Utilization of a developed support system for urban flood prevention measures for the disaster vulnerability
analyses of local governments in Vietnam
• Utilization of a system developed by companies that perform urban flood vulnerability analysis in Vietnam
• Monitoring of improvements, inadequacies, and deficiencies compared to existing practices
• Provision of information about flood-vulnerable areas in Vietnam and disaster prevention guidelines
Practical use and commercialization
• Development of products based on the Vietnam urban flood vulnerability analysis techniques and algorithms
• Commercial products can be developed based on the urban flood vulnerability analysis techniques and
methodologies for Vietnam
• Market targeting the sources of demand that perform research and work on urban flood vulnerability analysis in
Vietnam such as universities, research institutes, engineering companies, municipalities, and public institutions.

25. Thank you !!!
leebj@krihs.re.kr