CONCLUDING REPORTOnACTION PLAN TOWARD EFFECTIVE FLOOD
HAZARD MAPPING IN CAMBODIA

Prepared by:

HORN SOVANNA
Chief Office of Hydrology Works
Department of Hydrology and River Works (DHRW)
Ministry of Water Resources and Meteorology (MOWRAM)
Address: #576 N/R No.1, Sangkat Chak Angre Krom, Khan Mean Chey, Phnom
Penh, Cambodia
Email : hydrowork@online.com.kh / dhrw.cambodia@online.com.kh

1- Introduction
The training Program on Flood Hazard Mapping was conducted on 30 November until 2December 2006 by Public Works Research Institute (PWRI) of Ministry of Land, Infrastructureand Transport Japan International Center for Water Hazard and Management together with theJapan International Cooperation Agency (JICA). A total of 16 participants from 8 countries(Cambodia, China, Indonesia, Lao PDR, Malaysia, Philippines, Thailand and Vietnam) attended
the course. During the course, lectures related to flood were given not only by experts throughout
Japan . In those lectures, topics related to flood hazard map were discussed comprising history andprincipal of flood hazard mapping in Japan, numerical simulation to obtain anticipated inundationarea, evacuations procedures as well as experiences in producing flood hazard maps throughout
Japan. Beside lectures, 3 days of special field work on ‘Town Watching’ was conducted in MiePrefecture covering Tsu City, Ise City , Miya River and Shonai River with participation fromvarious offices and community group within the area.

A - Role of Flood Hazard Map to Mitigate Flood Damage in Cambodia
1 - Flood status in Cambodia
This chapter basically will discuss on the flood status in Cambodia almost every year is effectedby flood, flooding from the rivers and from the Localize rainfall. Many people who live ininundation area are faced to the problems Because of geographical condition, Cambodia had
occurred annually Flooding from the rivers and local rainfall. it has impacted seriously for : Floodmitigation requires real-time information on weather and hydrological forecasting, so that forecasts
and warnings along the Mekong River and some Tributary can be issued to people at risk place,for example for merchants who may need to remove goods please to stored at ground to upper
level. Forecasts of flooding are now become very interested for stakeholders and local authority
and international communities also. In Cambodia, flooding is not restricted to the floodplains
towns and rural areas (average flood and minimum flood, inundation), but the subject flash
flooding and heavy flood is generally heavy not stability social and national economic losses.
Many emergency situations cannot be avoided, it must be took care about flood management andmust be ensuring the availability of financial, human and material resources. It is meant needing
the help from network, coordinate individuals, agencies and organizations in order to a rapid andeffective response. This is where “ Flood Hazard Mapping ” on going apply.
a- Death toll : 347
b- Houses affected: 317,400 houses destroyed 7,000
c- Education, schools 988 damaged in 13 provinced- Health, health centers damaged 138
e- Production- Rice crop destroyed 374,000 ha- Other crops destroyed 47,000 ha- Livestock lost 3900 heads
f- Infrastructure- National and Province road damaged 2,600 km- Secondary road damaged 1,500 km- Rail road damaged 34 km- Bridges 115 sites damaged- Wells, culverts 11,900 damaged- Irrigation systems damaged 123 sites

CAMPARISON OF FLOOD IMPACTS ON POPULATIONYear
1996
2000
2001
2002

Household386,132
750,618
429,689
296,234

Impacts
People2,029,748
3,448,629
2,121,952
1,439,936

Death toll
169
347
6229

2 - Outline of present countermeasures for mitigating flood damages in Cambodia
Structural (curative) as well as non-structural (preventive) measures have been proposed toalleviate the flooding problem.
Structural measures
Flood control facilities construction in the Tamok dam, Kobsroy dam, Kompong Tuol damand National road # 6 belong the Tonle Sap River. This very importance around Phnom Penh
Capital City of Cambodia.
3 - Flood hazard maps will be useful in Cambodia
Flood Hazard Map is very useful to be implemented in Cambodia. With regards of theFlood Hazard Map objectives, to prevent loss of people’s lives and helps smooth refugee fromhome to evacuation shelter as well as to notifying the residents of potential flood damage andenhancing their awareness of the importance of flood disaster preparedness could be achieved.

B - The Allocation of Roll in Making Flood Hazard Maps in Cambodia
1-Organization should hold the main responsibility for making a fundamental map such as
anticipate inundation area map.
NoLine Agency

1

Ministry of Water Resources andMeteorology

23

Ministry of Finance
Ministry of Environment

45

Ministry of Land
Provincial Government

Role-Planning, coordinating and supervising relief-Operations during flood. Support the flood disaster preparedness
activities among the committee members.
- Providing flood forecasting and warning service to the public.
- Main organizations for planning, prepare and disseminate Flood
Hazard Map.
-Providing weather forecast information to flood forecasting andwarning activities-Prepare budgets for five yearly developments.
-Support and provide development allocation for flood mitigation
projects at the federal level.
-Providing the digital topographic map, DEM of the drainage basin-Support and provide development allocation
for flood mitigation projects at the state level.
- Dissemination of Flood Hazard Map- Provide information on evacuation routes intheir region.

2-Organization should hold the main responsibility for making and disseminating flood
hazard maps.
No1
2
3
4
5
67

Line Agency
Ministry of Water Resources andMeteorology
Ministry of Finance
Ministry of Environment
Ministry of Land
Provincial Government
National Committee for DisasterManagement.
Cambodia Red CrossRole-Making Flood Hazard Map.
-Dissemination of Flood Hazard Map-Prepare budgets-Support-Providing the digital topographic map, DEM of thedrainage basin- Dissemination of Flood Hazard Map- Dissemination of Flood Hazard Map- Dissemination of Flood Hazard Map

C– The “ Action Plan” of Making Flood Hazard Maps in Cambodia :1- Tonle Torch River Basin are the target area for flood hazard maps
- Tonle Toch River Basin is a tributary of Mekong river. It pass 2 provinces ( KompongCham & Prey Veng province ). Prey Veng province has been effected seriously by Mekong flood
through this river. Prey Veng was suffered seriously and longest prone inundation ( Peam Ro andBa Phnom district ). Prey Veng is covers an area 4,883 quire km and it was divided two main
regions. Flood plain which flooded every year from the Mekong River. This region has many
Streams, tributaries, lakes and Reservoirs for irrigation in dry season and supplementary crops.
-Central-plain which cover by rain-rice fields. They have not more water resource. They
have depended on the rainfall. This region has a small-scale irrigation systems and some places
have used ground water for irrigating. Prey Veng province was divided 12 districts, 116
Communes and 1,138 Villages. Totally populations are about 1,025,331persons .Among of those,
female are about 541,572 persons equal 52.8 % and mans are about 483,759 persons equal 47.2 %.
Totally families are 208,727 and density of people about 210 pers/km2.
-Prey Veng has 2 main rivers & 2 streams(Kompong Trabek & Stung Slot): In the covers
area about 488,300 ha, it was divided: land for rice field about 310,000 ha,( among those, rain riceis about 238,000 ha; dry rice is about 60,000 ha), land for crops is about 12,000 ha; forest land isabout 19,461 ha; land use is about 45,518 ha and other lands about 107,286 ha.

Inundation area

2- Necessary Tonle Torch River Basin are the target area for flood hazard maps
MAP OF PILOT SITE FOR CASE STUDY

Action Plan Area

3- Propose “Action Plan” within the next five year :Project Name: Flood Hazard Mapping (FHM )Summary of general action plan within 5 years ahead as follow: 2011

Target Area: Tonle Touch River Basin, Prey Veng Province Date: 28 Nov 05
No1Year2007

Action Plan
1- Deliver a presentation of FHM to my department

2- Formed the committee members of FHM
3- Gain and enhance my knowledge in anticipated inundation area mapping,Topographic Map and GIS (Flood Runoff Analysis)
4- Check the viability and update topographic map at Department of Survey
Mapping and Data collecting
5- Having some meeting and understanding of FHM between the relatedorganizations
6- Get an opinion and idea from the local residents’ perspective of FHM

22008

1- Promote the idea of FHM to the local government.
2- Educating people and enhancing their awareness due to flood disaster
preparedness
3- Start planning and doing some ground works of FHM for rural area. Target area

3

2009

1- Carry out survey to study effectiveness –DHRW
2- Model construction (consists Topographic Modeling, Flood Modeling and Flood
Stimulation).

4

2010

1- Model construction (consists Topographic Modeling, Flood Modeling and Flood
Stimulation)(cont …)

5

2011

1- To disseminate the completed FHM to the target group (State Resident)
2- Educating people and enhancing their awareness due to flood disasterpreparedness
3- Carry out survey to study effectiveness Tonle Torch River Basin
4- To conduct survey via questionnaire to the target groups with the view toimprove the usefulness of the FHM

Notice: FHM : Flood Hazard Map, NCDM : National Committee for Disaster Management,
DHRW : Department of Hydrology and River Works MOWRAM : Ministry of Water Resourceand Meteorology

4- Problems In Making Flood Hazard Map In Cambodia- Insufficient data e.g. updated topographical map- Data reliability – rainfall, water level and discharge- Flood modeling and flood stimulation- Social and economic impact such as sales and price of land and properties will beaffected by showing the forecasted inundation depth in the FHM.
- Suggestions for making this training course more meaningful

D- Conclusion
The capacity to deal with flood reduction still limited in terms of using the flood reduction
technology, knowledge, experience, fund and resources for the activities of flood. The selection ofpilot site for mapping is difficult due to inadequate of related data and information. Consideration,
support and willingness of Japanese Government Agencies especially Japan International
Cooperation Agency (JICA), Public Works Research Institute (PWRI) and all theparticipating country in relation to the training course are highly appreciated.