Hydrological characteristics of Da Nang City
31/05/2014 08:37:42

Da Nang City does not have a large natural area, yet it has a quite complex river network. The city rivers mainly belong to the downstream of Vu Gia – Thu Bon river network. Its hydrological regime is dominated directly by a precipitation regime across the river basin. Most of the Vu Gia-Thu Bon river basin area is located in Quang Nam Province. Only Cu De and Tuy Loan river basin are confined entirely within the territory of Da Nang City.

According to the report by the Hydrometeorological Station in the Central Vietnam, in 2008, the river flows in Da Nang seemed to have complex and abnormal movements in comparison with their multi-year average. In the dry season, most of the river flows were quite stable, and particularly had sharp fluctuations in the end of April and the early May. There were 6 small and medium floods with the largest flood peak in the Han River reaching its warning level 2 while other rivers reach the warning level 3. Mean annual water level in the rivers wasapproximately higher than its multi-year average.

 

   

 

Cu DeRiver – Da Nang City (Source: Golden Hills)

 
1. Hydrological Situation in the dry season 
a) The mean water level

The mean water level without tidal influences has a decreasing tendency from January until mid – April, a small increasing trend in the late April & May, and is then back to its declining path until the mid-August. The lowest mean water level in the rivers is mainly in the end of July and the early August.
Meanwhile, the river flows with tidal influences had pretty regular fluctuations in the dry season in 2008. The mean water level in dry season had a declining tendency from January until July, except its higher level in May. The mean water level became lowest in July.

b) The lowest water level
 
The lowest water level displays the degree of depletion of river flows in the year. According to the data measured at the stations, in 2008, the lowest water level without tidal influence occured in the end of July and with tidal influences in the early July, particularly later in the late July at Cau Lau.
2. Hydrological situation in the flood season
a) The mean water level

In 2008, the mean water level in the flood season (September – December) was approximately higher than its multi-year average of the same period. Particularly in December, the mean water level in the Thu Bon River at GiaoThuy, Cau Lau was lower than its multi-year average.

b) The highest water level

The highest water level (the food peaks) expresses the degree of flood (big or small) in the year. In the flood season in 2008, the flood with its warning level 3 occured in most of the rivers, except warning level 2 of Han River at Cam Le. The highest water level in 2008 happened at Cam Le Station. The water level at the upstream stations including Thanh My, Hoi Khach, HiepDuc was lower than the highest water level of multi-year average whereas the water level at other stations was higher.
 
 

  

 

 
 
 
 
 
 
 
 
 
 
 
 
 
              
 
 
 
 
 
 
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