Figure 2. Proposed alarm level compared to annual flood peak at Dong Hoi station
The number of Dak Mot station in central Highland (Figure 3) are five years (28%), twelve years (67%) and 16 years (89%) over alarm level III, II and I, respectively. In this station, water levels can reach to 584-585m and 585-587m for moderate and high floods. At Can Tho station in tidal area of the South (Figure 4), the maximum water level normally is higher than 2.0. The proposed flood alarm levels result 35% of 28 years water level over than alarm level III, 75% of collected years over alarm level II and 90% over alarm level I.