Shocks and stresses confronting Da Nang
09/05/2016 14:42:40

Although considered one of the best cities to live in in Vietnam, also chosen as an attractive place to visit of the planet, the city of Da Nang is vulnerable to shocks such as storms, floods, droughts… and stresses such as water shortage, unemployment, and lack of basic service providing for community especially vulnerable people.

Extreme weather has led to significant consequences to the city in the past few years. Unpredictable high-intensity storms, floods and droughts have occurred frequently, causing extensive damage.

 

Storms and tropical depression

On average, there are about 10 storms and tropical depressions every year that form in the East Sea, of which 5 to 6 events make landfall in Vietnam. Da Nang city is directly affected by one storm or tropical depression per year on average with wind velocities above Level 6 (40-50 km/h) at sea.
   
Table 2: Distribution of storms and tropical depressions directly affecting Da Nang by month(1976-2010 total)

Month

3

4

5

6

7

8

9

10

11

12

Year

Number

1

0

3

11

10

12

24

32

19

1

113

 
Floods
The annual flood season of the Vu Gia-Thu Bon river system is from October to December. However, the flood season is not stable. Many years see floods in September or January. Over more than 25 recent years, the highest flood peaks were recorded at different hydrological stations as follows:
 
Table 3: Highest flood peak recorded at hydrological stations (1976-2000)

Elements

Thanh My Station

Nong Son Station

Thời gian xuất hiện

20/11/1998

20/11/98, 4/12/1999

Lưu lượng lớn nhất (m3/s)

7000

10,600


Drought
Low rainfalls in dry seasons are the main reason for droughts, especially in the years without May-rain floods. Droughts frequently happen when water flows in rivers, streams and ponds or lakes, etc. are significantly reduced. It leads to a decline in soil moisture and groundwater levels.
In recent years, due to climate change impacts on annual rainfalls where low rainfalls are seen in dry seasons (only high rainfalls in wet seasons), droughts are increasingly appearing in the Vu Gia – Thu Bon river systems and other river systems within the city. 

Saline intrusion at estuaries
The average highest salinity boundaries in dry seasons on rivers in Da Nang and the highest salinity in the record drought year of 1983 are shown as follows:

Table 5: Numbers of days having saline intrusion and highest salinity at Cau Do in 2013
Month

2

3

4

5

6

7

8

Number of day having saltwater intrusion

28

31

30

27

28

14

9

S max (‰)

2.91

5.62

6.96

3.46

3.91

1.80

1.85

 
Housing issue
Housing development in Da Nang only serves the purpose of improve the city’s appearance, without consideration of natural disaster resilience. Therefore, when disasters, especially storms and floods, occur, the losses that households (mostly poor people) have to bear are huge.
Through collecting survey data on housing structure and housing situation of DaCRISS project in 07 districts 2008, it can be seen that houses with very poor, poor and acceptable improvement accounted for up to 73.2% of total houses in Da Nang. Housing for migrant workers (mainly boarding houses provided by the locals) accounted for 96% while there are few dormitories for migrant workers of businesses and local government. The demands for housing of migrant workers stay high while there is lack of housing providers, having no control of quality and price, leading to the instability in housing for migrant workers.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Da Nang Climate Change Coordination Office (CCCO)

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