Capacity development in flood risk reduction

capacity development program

Flood and inundation occur every where in rainyseason in Vietnam• Viet Nam has around 331,000 km2 of natural land.
• Located in monsoon humid tropics, Viet Nam isaffected by both oceanic and continental climates,
especially flood and inundation.
• There are 2,360 rivers and streams that have lengths
longer than 10 km, in the central VietNam: 740.
• The coastal plains are not large but denselypopulated (60% of population) with many importantand rather developed political, socio-economic
centers. Most plains are with low elevation, easy tobe flooded or inundated.
• High Flood and inundation last for about 2-7 days in
the Central Viet Nam, 7-15 days in the North VietNam, and 3-4 months in the Mekong River delta.
• Depth of inundation is about 2-4m, in some places it
would reach 5-8m.

9Combination of typhoon, storm surge, heavy rain and hightidal level would cause the flood more severe.
9Often associated with heavy rains, typhoons, tropicaldepressions, occur in a large area covering some provincesor almost the whole region.
9Rivers are steep, times of concentration are short, anddownstream areas have low drainage capacity.
9Somehow can be classified as flash floods.
9Tide and storm surge play a certain role in increasing
inundation.
9Flood and inundation in the Central Viet Nam is ranged as
the most severe. It occurs with high frequency causing
prolonged inundation in small, narrow coastal areas wheresocio-economic centers and densely populated areas arelocated.

In Vietnam during 2007 have beenvery complicated with several
extreme weather events occurred allover our country, especially in theCentral part of Vietnam together
with 3 tropical storms and 1 tropicaldepression that exerted their direct
impacts on our territory.
• Flood was very serious withsuccessive and very high peaks,
rather high flood rising intensity;
flood: concentrated very quickly,
caused the serious prolonged
inundation in 12 provinces ofVietnam.
The points with flood peaks higher than III alert in 2007

•In the central of Vietnam: from 1st October to the end November 2007 inmost rivers in Thua Thien Hue, Quang Nam, Quang Ngai, Binh Dinh, Phu
Yen provinces, occurred 6 extremely big, historical floods such as:•The Flood, inundation No-1 in early August 2007
Affected by TS No2, (05 to 08 August 2007), in most of coastal
provinces of Central Viet Nam from Thanh Hoa to Thua Thien Hue: heavy
rainfall in a large area, in some places, extremely heavy rainfall.

•Flood, inundation No-2 in early October 2007
Affected by TYP No5 (LEKIMA)
In many other rivers in Central Viet Nam, big flood occurred with the peakexceeding the alarm level 3 such as Huong (Thua Thien Hue province),
Thach Han (Quang Tri province), Kien Giang and Gianh rivers (Quang Binhprovince,...

•Flood, inundation No 3 in early November 2007
Affected by TS N-6 (PEIPAH) in combination with rather strong activityof southeast wind (from 09 to 13 November 2007), in most of coastal
provinces of Central Viet Nam from Thua Thien Hue to Binh Dinh, occurred
heavy rainfall in a large area and big flood occurred.

• The common total rainfall for 4 days varied
from 500 to 700 mm; in some places, thevalue was higher 800 mm, such as Nam
Dong: 1773mm, Thuong Nhat: 1248mm, A
Luoi: 834mm.
• The heavy rainfall caused the mostserious, severe and complicated flood,inundation:

Socio-economic Assessment
The loss human and property:• Due to TS No. 2 (NONAME): 77 people were reported
dead, 123 injured, 6 missing people; 1 473 houses
were collapsed and damaged; 51 ships were sank; 67
132 ha of rice field were flooded.
• Due to TYP No. 5 (LEKIMA): 88 people died, 180
injured and 8 missing people; 1 853 houses werecollapsed and damaged; 46 ships were sank; 8 849 haof rice fields were flooded.
• Tropical Depression No. 6: 07 people died, 01
missing and 92 injured people; 886 houses weredamaged; 9416 ha of rice were flooded and damaged.
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Th-î ng NhËtB¶n®å l- uvùcs«ngH- ¬ngvµc¸ctr¹mkhÝt- î ngthñyv¨ntrªnl- uvùcThe hydrological model for flood forecasting for Huong river.
- Rainfall-runoff models, method of corresponding stage and multivariable
regression have been used to produce short-term river forecasts.
-In recent years, different models like TANK, NAM, MARINE- Forecasting accuracy is 75-80% for short-term forecasts respectively

Capacity Building Programs (CBP)Of AWCI• Proposed location: Tokyo, Japan.
• Requested Topics:– Flood and Drought Management System;– Flood Inundation Modeling;• We are interested in CBP mode and thetopics:– Flood and Drought Management;– System Flood Inundation Modeling;– Rainfall Downscaling and Forecast• Expected number of participants: 3persons foreach topic• Proposed duration of program: 10days• Target audience:Professional• Case Study Modules:–Flood and Drought Management
System;–Rainfall Downscaling and Forecast;–Flood Inundation Modeling;• 2008 year:• We need to Organize GBHM training course in Vietnam for
improvement the skill, Knowledge in apply the DHM model for
Huong river basin:• Time : March, 2008 (about 10 days);• Number of participation: 20;• The content of the training course:– The skill, Knowledge in apply the DHM model for Huong river basin ;– How to apply the GBHM for any river basin: skill, Knowledge in building
the input data for modeling: DEM, land use, soil type, geological maps,
how to delineate the watershed, divide the basin to sub-basins, set-up
spatial distribution of study area, prepare time series data: rain gauge
and interpreted radar products.

• Fund for training course: Vietnam;• Fund for teacher: from AWCI fundThank you very much