Statistical study suggests an incre

Statistical study suggests an increasing trend in water level of about 1.5 cm per year over the last 20 years at Sai Gon River and surroundings. Some scenarios were simulated for a typical project in Ho Chi Minh City, which was found that SLR would reduce effectiveness of conduit system remarkably. The problem is enhanced by land subsidence relating to ground water exploitation and high-rise buildings.
- Hypothesis of increasing trend of heavy rainfall at Ho Chi Minh City for the past 52 years is statistically confirmed with at least 95% confidence limit. The overall linearly increasing rate is estimated as much as 0.8mm per year. This fact agrees with theories of Heat Island Effect on heavy rainfall. The effect of rainfall increasing on capacity of drainage system would be very serious. The problem should be solved by application of water detention techniques.
- Climate change and SLR would result in overload and surcharge of storm sewer systems in the future. Modification of the conventional design code for sewer system to operate under overload conditions in the future requires sophisticated studies including modeling and non-conventional analysis techniques.
- Introduction of tide control gates that work with tide level signal to cut-off tide peak only would produce satisfying results in most of cases in the future

Results (Vietnamese) 2:

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