Viet Nam

Vietnam: Immediate report on flood and rain in the central provinces from Thua Thien - Hue to Khanh Hoa - 05 Dec 1999

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(English Translation Prepared by UNDP Project VIE 97/002 - Disaster Management Unit)
I. The Synopsis of Flood and Rain:
(According to Bulletin No.163/PCLBTW, issued by the Standing Office of the Central Committee for Flood and Storm Control in Hanoi at 10:00 AM on 05 December 1999).

1. Rain:

From 30 November 1999 to 04 December 1999, due to effect of tropical depressure in combination with cold air, there were heavy-to-very heavy rains, in Central Provinces (notably very heavy rains in Provinces from Thua Thien -Hue to Khanh Hoa). As of 07:00 on 04 December 1999, rainfalls measured at these provinces are as follows:

In Thua -Thien Hue Province: (from 19:00 PM 02 December to 7:00 AM 04 December 1999), mean rainfall measured at some places were as follows:

- Kim Long (Hue City): 338 mm
- Thuong Nhat: 290 mm
- Nam Dong:293 mm
- Phu Oc: 448 mm
- Ta Luong: 210 mm

In Quang Nam- Da Nang Province: (from 01 December 1999 to 07:00 AM 04 December 1999 ): mean rainfall was at 450 to 800mm. Notably, there were very big rainfalls in:

Ai Nghia: 691 mm
Tien Phuoc: 988 mm
Nong Son:807 mm
Hoi An: 548 mm
Da Nang; 439 mm
Hiep Duc: 884 mm
Cau Lau: 551 mm
Tam ky: 585 mm
Notably, in Xuan Binh, to the southwest of the province, rainfall reached 2136 mm.
On 04 December 1999, there was a little rainfall but from 23:00 on 04 December to 04:00on 05 December 1999, there were heavy rain again (notably very heavy rain at the Phu Ninh Lake, mean rainfall measured at the Phu Ninh Lake was at 212 mm , at Xuan Binh (upstream of the Phu Ninh Lake) was at 337 mm.

In Quang Ngai Province (from 01 December 1999 to 07:00 AM 04 December 1999): rainfalls were at:
Tra Bong: 705 mm
Ba To: 1068 mm
Quang Ngai Town: 364 mm
Duc Pho: 489 mm
Son Giang: 1412 mm
Minh Long: 1180 mm
Mo Duc: 392 mm
In Binh Dinh Province (from 30 November to 04 December 1999)
In the north of the province, mean rainfall was 300 to 670 mm (notably 670 mm in An Hoa District)

In the south of the province, mean rainfall was 150 to 300 mm (notably 309 mm in Vinh Son District)

In Phu Yen Province (from 30 November to 03 December 1999)
Ha Bang: 195 mm
Phu Lam: 505 mm
Hinh River: 656 mm
Cung Son: 277 mm
Tuy Hoa: 429 mm
Hoa Thinh: 538 mm
In Khanh Hoa Province (from 07:00 AM 01 December to 7:00 AM 04 November 1999)
Van Ninh: 447 mm
Nha Trang:227 mm
Cam Ranh: 133 mm
Khanh Son: 152 mm
Ninh Hoa: 410 mm
Dong Trang: 295 mm
Khanh Vinh: 297 mm
2. The Synopsis of inundation:
Heavy rain, concentrating in a short period of time, caused flash flood in some places in mountainous areas of Quang Ngai Province and caused large flooding on river banks from Thua Thien Hue to Khanh Hoa Provinces. Notably, there were very large floods on rivers Quang Ngai Province.

As of 17:00 04 December 1999, flood water levels in most rivers reached their peaks and were above Alarm Level III. Notably, in Quang Ngai Province, there were historical flooding (largest flooding in 40 years) on the Ve and the Tra Khuc Rivers. On the River in Binh Dinh, Quang Nam, and Thua Thien Hue Provinces, there were large flooding, above Alarm Level III. Flooding caused heavy inundation on a large scale. The situations of flooding and inundation in the Central Provinces are as follows:

In Thua Thien- Hue Province:

At 23:00 on 03 December 1999, the flood water levels on the Huong River at the Hue gauging station reached its peak, at 3.73 m. At morning on 04 December 1999, the flood water levels fell at 3.04 m

At 24:00 on 03 December 1999, the flood water levels on the Bo River at the Phu Oc gauging station reached its peak, at 4.12 m. At morning on 04 December 1999, the flood water levels fell at 3.82 m.

40 communes in Huong Tra, Quang Dien, Phu Vang, Huong Thuy, and Phu Loc Districts, and Hue City were 0.5 to 1.0 m under water. The K900 (K" Kilometre) of the 1A National Highway (on the temporary bridge in the Hai Van Pass) was eroded, causing transportation block from 16:00 to 22:00 on 03 December 1999. The K800 to K860 portions of the National Highway were 0.3 m to 1.0 m under water.

In Quang Nam Province:

At 11:00 on 04 December 1999, the flood water levels on the Vu Gia River at the Ai Nghia gauging station reached its peak, at 9.43 m and now are falling slowly.

At 15:00 on 04 December 1999, the flood water levels on the Thu Bon River at the Cau Lau gauging station reached its peak, at 4.54 m. At 04:00 on 05 December 1999, the flood water levels were measured at 4.17 m.

The flooding caused deep inundation in Dien Ban, Hoi An, Duy Xuyen Districts. 20,000 households were forced to move. Houses, infrastructure and water resource works were seriously inundated.

In Quang Ngai Province:

At 09:00 on 04 December 1999, the flood water levels on the Tra Khuc River at the Tra Khuc gauging station reached its peak, at 8.36 m (0.35 m surpassed the historical level in 1964). Now, the flood water levels are falling slowly. At 04:00 on 05 December 1999, the flood water levels on the tra Khuc River at the Tra Khuc gauging station was at 6.38 m. However, due to heavy rain, there will be continual inundation on downstream the Tra Khuc River. At 03:00 on 04 December 1999, the flood water levels on the Ve River at the Ve River Bridge gauging station reached its peak, at 5.83 m (0.35 m surpassed the historical level in 1964). Now, the flood water levels are falling slowly.

All districts are inundated. Some places were 1.5 to 3.0 m under water, causing difficulties for relief missions.

In Binh Dinh Province:

At 18:00 on 03 December 1999, the flood water levels on the Lai River at the Bong Son gauging station were at 7.61 m (0.61 m above Alarm Level III, surpassed the peak in early November 1999 and the highest level in 1998).

At 06:00 on 04 December 1999, the flood water levels on the Kon River at the Thach Hoa gauging station was at 8.55 m (1.05 m above Alarm Level III, surpassed the flood water levels in early November 1999). Now, the flood water levels are falling slowly.

The central and downstream areas of the Lai and the Kon River are seriously inundated with more than 30,000 households were 1 to 3 m under water. Traffic roads and communications were blocked.

According to forecast by the HMS, due to heavy rain and cold air, the flood water levels on rivers will likely to rise again.

In Phu Yen Province;

At 12:00 on 03 December 1999, the flood water levels on the Ba River at the Cung Son gauging station reached its peak, at 34.59 m (1.09 m above Alarm Level III).

At 16:00 on 03 December 1999, the flood water levels on the Da Rang River at the Phu Lam gauging station was at 3.83 m (0.63 m above Alarm Level III).

Low areas of the Tuy Hoa Town were 0.8 m under water.

Many portions of the 1A National Highway were eroded.

In Khanh Hoa Provinces:

At 18:00 on 03 December 1999, the flood water levels on the Cai River at the Ninh Hoa gauging station reached its peak, at 6.15 m (1.15 m above Alarm Level III).
At 19:00 on 02 December 1999, the flood water levels on the Nha Trang River at the Dong Trang gauging station was at 12.85 m.
The Van Ninh, Ninh Hoa, Nha Trang, Dien Khanh, and Cam Ranh Districts were seriously inundated.

3. The Synopsis of Reservoirs:

On 04 December 1999, the flood water levels on all reservoirs are at peak and now falling slowly. At the Phu Ninh Lake, the highest flood level measured at 112:00 on 04 December 1999 was at34.37 m. Due to heavy rain, as of 07:00 on 05 December 1999, the flood water levels were at 34.44 m (above the peak level on 04 December) and now continue to rise.

II. Damages caused by flooding:

As of 19:00 on 04 December 1999, the situational damages are as follows:

People:
+ Dead: 27
+ Injured: 7

+ Missing: 4

Houses:
+ Collapsed or swept away: 242
+ Destroyed: 194,162

+ Moved: more than 10,000

Paddy crops destroyed: 29,082
(See attached Table for details)

III. The Preparedness Activities to Prevent Flood - Rain:

On 04 December 1999, the Prime Minister issued Official Telegram No. 1276/CP and sent it to th Provincial People's Committees in provinces from Thua Thien - Hue to Khanh Hoa Provinces and other relevant agencies, requesting them to monitor the relief missions to minimise people and property losses.
At the morning on 04 December 1999, the CCFSC held a conference to draw out measures for disaster preparedness and mitigation. Deputy Prime Minister Nguyen Cong Tan participated in the conference and gave his advice in implementing these activities.
At noon on 04 December 1999, the Minister - Director of the CCFSC came to the Central Provinces to directly monitor the flood preparedness and mitigation.
The Ministry of Defence sent 2 helicopters to Quang Ngai Province and organised 5 flights carrying life buoys and aid commodities to flood-affected areas. The ministry also sent helicopters carrying 1850 life buoys to Da Nang City and Quang Ngai Province.
The CCFSC contacted to the People's Committee of Da Nang, requesting them to prepare 20 tons of constant noodles to support to 200,000 households in Quang Ngai Province.

The Ministry of Police issued Official Telegram No. 752 -HT dated 04 December 1999 and sent it to the Provincial Services of Police from Thua Thien - Hue to Khanh Hoa, requesting them to coordinate with relief agencies in implementing relief missions.
The Provincial People's Committee of Quang Nam mobilised 1200 soldiers of the 315 Division and 270 Brigade of the V Military Zone and many means of rescuing to save to the dam of the Phu Ninh Lake at night on 03 December 1999.
IV. Pressing activities needed to be done at present:
Monitor localities in mobilising people for relief missions in seriously inundated areas. Implement aftermath overcoming activities to stabilise people's lives and production.
Monitor the implementation of measures for securing reservoirs in preparation for bad and complicated weather.
Request the Ministry of Transport and Communication to immediately rehabilitate destroyed transport lines to facilitate relief mission and stabilisation of people's lives and production.
Request the Ministry of Police to monitor social order and security in inundated areas.

Distribution:
Deputy Prime Minister Nguyen Cong Tan
The Central Office of the Party
The National Assembly Office
The President Office
The Government Office
Relevant Ministries and Sectors
Viet Nam News Agency, Viet Nam Television, the Voice of Viet Nam
Nhan Dan Newspaper
Records
Director of the Standing Office of the CCFSC
Nguyen Ty Nien