This presentation is part of the ProSPER.Net Young Researchers' School 2017 ‘Water Security For Sustainable Development in a Changing Climate’.

1. Proposed Soai Rap River
tidal barrier for flood &
inundation and salt
intrusion management in
the HCMC – Dong Nai –
Long An area
Prof. Dr. Nguyen Tat Dac

2. Content
• HCMC and related issues to urban flooding
• Planning hydraulic structures and advantages
and disadvantages of these structures
• Proposed Soai Rap River tidal barrier
• Obtained results of Soai Rap River tidal barrier
• Advantage and disadvantage of Soai Rap River
tidal barrier
• The correlation of Soai Rap River tidal barrier to
hydraulic structures in planning of urban flood
control (Decision No. 1547)
• Sea level rise
• Conclusion and recommendation

3. HCMC & related issues
 Topography:
 <= 1,5 m(65%)
 <=2,0 m(75,6%)
 Waterlevel
 Spring tide from December
toFebruary (next year) and
neap tidefrom May to
August.
 Maximum water level at
Phu An 1,40-1,50m(1.54m
11/20081.56m11/2009).

4. INLAND WATERWAY NETWORK

5. LOCATION OFREGULAR FLOODED AREAS
Area of District 5

6. Flooded by rainfall and tide
• Flooded by tide
• Flooded by rainfall

7. Flooded by rainfall

8. SYNTHESISOF URBANFLOODINGCAUSESINHCMC
TAY NINH
LONGAN
BINH DUONG
DONGNAI
BA RIA – VUNG TAU
TIDE
RAINFALL
The water level in the upstream of Thu Dau
Mot is affected by flood discharge from Dau
Tieng Reservoir
The water level in the downstream of
Thu Dau Mot is affected by tide
mainly (including sea level rise?)
Flooded by climate change and sea level rise

9. PROPOSED SOLUTIONS AND ADVANTAGE & DISADVANTAGE OF THESE
SOLUTIONS
A. SOLUTION OF FLOOD AND INUNDATION MANAGEMENT AT THE OUTER RING (Flood and inundation management team – MARD)
This solution is the most
effective one for tide control
at the outer ring but the
scope and investment cost are
significant, meanwhile the
hazard of ecosystem is
potential afterward.
High impact on inland
waterway

10. PROPOSED SOLUTIONS AND ADVANTAGE & DISADVANTAGE
OF THESE SOLUTIONS
B1. Tidal gates at the inner ring

11. Dike and 12 tidal gates at the inner ring
1- Rach Tra
2- Vam Thuat
3- Ben Nghe
4- Tan Thuan
5- Phu Xuan
6- Muong Chuoi
7- Song Kinh
8- Kinh Lo
9- Kinh Hang
10- Thu Bo
11- Ben Luc
12- Kinh Xang

12. 6 gates: Ben nghe,Tan Thuan, Phu xuan,Muong
chuoi, Cay Kho, Phu dinh are in construction

13. PROPOSED SOLUTIONS AND ADVANTAGE & DISADVANTAGE OF THESE SOLUTIONS
B2. SOLUTION OF DISCHARGE AND TIDE CONTROL AT THE INTERFLOW OF SAIGON – DONG
NAI RIVERS (MIDDLE RING); (Flood and inundation management team – MARD)
This solution is effective
in tide control, decreasing of
water level inside at District 2
and 9, improving of drainage
capability in the urban area
and flood and inundation
mitigation caused by tide.
Big investment in dike
and tidal gates as well as
increasing of ground
elevation.
Operation procedure of
each tidal gate is necessary.
Impacts on inland
waterway.

14. HYDRAULIC SCHEME USED IN
FLOOD AND INUNDATION
MANAGEMENT SIMULATION
THE
RELATIONSHIP
WITH MEKONG
DELTA IS
NEGLECTED

15. Some figures of flood and inundation
management solution in HCMC (flood
management team – MARD)
• 43 big and small tidal gates, total width 940
m as planned (710 m as proposed)
• Dike: A hundred of km (172kM)
• Effect: Flood and inundation management in
HCMC (rainfall and tide management)
• Impact: waterway (tidal gates closed
averagely 8.8 hours/day during a period of 5
months)
• Increase water level in the main river → Salt
intrusion to intakes of drinking water
treatment plants

16. Obtained conclusions from
hydraulic simulation
• Max water level at Nha Be increased about 0.37 m
compared to existing situation
• Max water level at Phu An increased about 0.43 m
compared to existing situation
• Max water level at Ben Luc increased about 0.41 m
compared to existing situation
• 3 tidal gates (Thu Bo, Muong Chuoi, Kinh Lo)
installed, water level decreased 2-8 cm, eventhough
these 3 tidal gates are in operation of 1 way only.
• 5 tidal gates (Thu Bo, Muong Chuoi, Kinh Lo, Song
Kinh, Kinh Hang) installed in Southern area, water
level decreased 26-45 cm. However, the flows
velocity at Ben Nghe, Tan Thuan and Phu Xuan is in
trend of increasing.

17. C. HYDRAULIC STRUCTURE OF FLOOD AND INUNDATION MANAGEMENT AT THE
FURTHEST OUTER RING (Directorate of Water Resources) – INSTALL TIDAL BARRIER 33
KM CONNECTED VUNG TAU AND GO CONG
This is the greatest
tidal barrier in Vietnam
that significantly
impacts on waterway
system and ecosystem in
terms of mangrove
forest at Can Gio.
Impacts on salt
intrusion at Tien Giang
and sediment
accumulation at Dai and
Tier estuaries.
Ongoing study
PROPOSED SOLUTIONS AND ADVANTAGE & DISADVANTAGE OF
THESE SOLUTIONS
C1- Solution of shiplock

18. C2- Vung Tau – Go Cong tidal barrier: Bridge solution
THE RELATIONSHIP WITH MEKONG DELTA IS NEGLECTED; HAZARD OF
SALT INTRUSION IN TIEN GIANG, SEDIMENT ACCUMULATION AT DAI AND
TIEU ESTUARIES

19. PROPOSED SOAI RAP RIVER TIDAL BARRIER
 River width: 3km
 Total width of
tidal barrier:
maximum 800m-
1km
 Operated in 3
periods:
- January – May:
barrier opened in
400 m
- June – August:
barrier opened in
150 m
- September –
December:
opened 100 m,
opened more 500
– 600 m for the
direction of
upstream to
downstream for
tide control and
released
discharge to the
sea
SOAI RAP TIDAL BARRIER
Cho Gao canal

20. SIMULATION BASE FOR PROPOSED STRUCTURE
• Used detailed modelling
scheme for entire
catchment including
detailed network of Sai
Gon – Dong Nai – Nha
Be – Thi Vai Rivers
• Salt intrusion simulation
in 6 months of dry season
2008
• Discharge simulation in
12 months of 2000 (the
year of big discharge)

21. Simulated options for dry season (2008)
• Existing situation in 2008: Represented by HT
• Definitely closed of Soai Rap tidal barrier:
represented by Dg
• Opened in according to the width of 100, 200,
300, 400, 500, 600, 700 (m) are M10, M20, M30,..
• The representative signs used in simulated
tables of dry season: HTHmax, HTSma (existing
H max and S max).
• Dg-HT, M10-HT, M20-HT,…are comparisons of
increasing (+) and decreasing (-) with existing
(HT) for the cases of closing tidal barrier (Dg),
opening 100m (M10), opening 200m (M20),…

22. SIMULATION OF WATER LEVEL IN THE DRY SEASON 2008
River/Canal Location HTHma Dg-HT M10-Ht M20-HT M30-HT M40-HT M50-HT M60-HT M70-HT
My Tho-Cho Gao 1.4 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01
1.17 -0.58 -0.45 -0.38 -0.32 -0.28 -0.24 -0.21 -0.19
1.1 -0.59 -0.46 -0.37 -0.31 -0.26 -0.22 -0.19 -0.17
Cho Gao-Vam Co 1.09 -0.58 -0.45 -0.37 -0.31 -0.26 -0.22 -0.19 -0.17
Tuyen Nhon 0.88 -0.33 -0.21 -0.14 -0.1 -0.08 -0.06 -0.05 -0.04
0.88 -0.34 -0.23 -0.16 -0.11 -0.09 -0.06 -0.05 -0.04
0.86 -0.34 -0.24 -0.16 -0.12 -0.09 -0.07 -0.05 -0.04
Interflow of VCT - VCD 0.85 -0.33 -0.23 -0.16 -0.12 -0.09 -0.07 -0.05 -0.04
VCD 0.65 -0.3 -0.21 -0.15 -0.11 -0.09 -0.07 -0.06 -0.05
0.7 -0.31 -0.22 -0.16 -0.12 -0.09 -0.07 -0.06 -0.05
Ben Luc 0.74 -0.33 -0.23 -0.16 -0.12 -0.09 -0.07 -0.06 -0.05
0.8 -0.35 -0.24 -0.18 -0.13 -0.1 -0.08 -0.07 -0.06
Interflow of VCT - VCD 0.85 -0.33 -0.23 -0.16 -0.12 -0.09 -0.07 -0.05 -0.04
1.24 -0.73 -0.59 -0.49 -0.43 -0.37 -0.32 -0.27 -0.23
Vam Co - Soai Rap 1.41 -0.9 -0.74 -0.63 -0.55 -0.48 -0.41 -0.33 -0.28
SG: Thi Tinh 1.29 -0.67 -0.52 -0.37 -0.27 -0.2 -0.15 -0.12 -0.09
Thu Dau Mot 1.29 -0.68 -0.52 -0.39 -0.28 -0.21 -0.16 -0.13 -0.1
Thanh Da 1.26 -0.67 -0.51 -0.39 -0.29 -0.22 -0.17 -0.13 -0.11
Tan Thuan 1.29 -0.72 -0.56 -0.44 -0.34 -0.26 -0.2 -0.16 -0.13
1.31 -0.74 -0.58 -0.46 -0.35 -0.27 -0.21 -0.17 -0.13
Den Do (SG) 1.32 -0.75 -0.59 -0.46 -0.36 -0.28 -0.21 -0.17 -0.14
Cho Gao
canal
Vam Co Tay
VCD towards
Soai Rap
Sai Gon
River: from
Thi Tinh
towards Den
Do
The increasing or decreasing of water level (m) in accordance with the width of opening the barrier

23. SIMULATION OF WATER LEVEL IN THE DRY SEASON 2008
River/Canal Location HTHma Dg-HT M10-Ht M20-HT M30-HT M40-HTM50-HT M60-HT M70-HT
Dong Nai Bridge 1.41 -0.79 -0.63 -0.46 -0.34 -0.26 -0.2 -0.15 -0.12
D.Nai: Cat Lai 1.31 -0.73 -0.57 -0.44 -0.34 -0.26 -0.2 -0.16 -0.13
1.31 -0.73 -0.58 -0.45 -0.34 -0.26 -0.2 -0.16 -0.13
Den Do (Dong Nai) 1.32 -0.75 -0.59 -0.46 -0.36 -0.28 -0.21 -0.17 -0.14
1.33 -0.76 -0.6 -0.48 -0.37 -0.29 -0.22 -0.18 -0.14
Nha Be 1.33 -0.76 -0.61 -0.49 -0.38 -0.29 -0.23 -0.18 -0.15
1.48 -0.94 -0.77 -0.65 -0.54 -0.44 -0.36 -0.29 -0.24
1.51 -0.98 -0.81 -0.69 -0.58 -0.49 -0.4 -0.32 -0.27
Upstream of Soai Rap barrier1.61 -1.09 -0.92 -0.81 -0.71 -0.61 -0.5 -0.42 -0.35
Downstream of Soai Rap barrier1.61 -0.02 -0.02 -0.02 -0.02 -0.02 -0.02 -0.02 -0.02
Long Tau (Nha Be) 1.33 -0.76 -0.61 -0.49 -0.38 -0.29 -0.23 -0.18 -0.15
1.43 -0.58 -0.47 -0.35 -0.27 -0.21 -0.17 -0.13 -0.11
1.71 -0.09 -0.07 -0.06 -0.05 -0.04 -0.04 -0.03 -0.03
1.67 -0.04 -0.03 -0.03 -0.02 -0.02 -0.02 -0.01 -0.01
Chu Y bridge 1.27 -0.73 -0.57 -0.46 -0.36 -0.29 -0.23 -0.18 -0.15
This waterway 1.28 -0.77 -0.61 -0.51 -0.42 -0.35 -0.3 -0.25 -0.21
Close to Vam Co 1.27 -0.76 -0.61 -0.51 -0.44 -0.38 -0.33 -0.27 -0.23
Can Giuoc 1.06 -0.57 -0.43 -0.34 -0.27 -0.21 -0.17 -0.14 -0.12
1.28 -0.77 -0.61 -0.51 -0.42 -0.35 -0.3 -0.25 -0.21
Ben Luc (VCD) 0.8 -0.35 -0.24 -0.18 -0.13 -0.1 -0.08 -0.07 -0.06
0.87 -0.41 -0.29 -0.21 -0.16 -0.13 -0.1 -0.08 -0.06
Ben Luc (Can Giuoc) 1.06 -0.57 -0.43 -0.34 -0.27 -0.21 -0.17 -0.14 -0.12
Along Dong
Nai, Nha Be,
Soai Rap
Rivers
Long Tau
River: from
Nha Be
interflow
towards the
From Chu Y
bridge to Vam
Co River
(waterway)
Can Giuoc
river
Ben Luc river:
from VCD to
upstream Can
Giuoc river
The increasing or decreasing of water level (m) in accordance with the width of opening the barrier (cont.)

24. SIMULATION OF SALINITY IN THE DRY SEASON 2008
River/Canal Location HTSma Dg-HT M10-Ht M20-HT M30-HT M40-HT M50-HT M60-HT M70-HT
My Tho-Cho Gao 2.38 0.2 0.18 0.19 0.17 0.11 0.04 0.03 0.03
14.68 -3.66 -5.91 -5.34 -4.32 -5.29 -4.15 -4 -3.75
Cho Gao-Vam Co 21.57 -6.7 -9.16 -8.32 -5.88 -5.46 -3.3 -3.55 -2.73
Tuyen Nhon 0.91 -0.84 -0.82 -0.79 -0.65 -0.63 -0.43 -0.39 -0.21
5.63 -5.05 -4.95 -4.41 -3.62 -3.13 -2.41 -2.14 -1.02
VCT-VCD interflow 21.68 -6.07 -7.88 -7.08 -5.02 -4.73 -2.98 -2.62 -2.1
Vam Co Dong 20.09 -5.55 -7.52 -6.8 -4.78 -4.54 -3.06 -2.52 -1.93
Ben Luc 20.57 -5.78 -7.73 -6.99 -4.92 -4.61 -3.12 -2.54 -1.95
VCD-VCT interflow 21.68 -6.07 -7.88 -7.08 -5.02 -4.73 -2.98 -2.62 -2.1
22.85 -4.68 -6.31 -5.33 -3.96 -3.27 -2.36 -2.43 -1.91
Vam Co-Soai Rap 23.87 -4.32 -5.52 -4.41 -3.27 -2.58 -2.05 -2.06 -1.51
Sai Gon-Thi Tinh 0.69 0.01 -0.1 -0.18 -0.14 -0.12 -0.15 -0.12 -0.11
Thu Dau Mot 1.05 0.17 -0.11 -0.24 -0.2 -0.18 -0.24 -0.22 -0.2
Thanh Da 2.71 1.73 0.61 -0.33 -0.48 -0.4 -0.7 -0.76 -0.51
Tan Thuan 5.98 5.42 1.81 0.22 -0.66 -0.62 -0.57 -0.7 -0.93
Den Do (Sai Gon River) 7.72 5.71 2.32 0.14 -0.59 -1.1 -1.36 -1.49 -1.47
Can Giuoc 12.73 3.39 -1.14 -2.5 -2.33 -2.47 -2.29 -2.24 -1.87
13.95 3.73 -1.43 -2.99 -2.66 -2.64 -2.37 -2.46 -2.15
Can Giuoc river
Cho Gao canal
Vam Co Tay
Vam Co Dong-
Soai Rap
interflow
Sai Gon River:
from Thi Tinh to
Den Do interflow
The increasing or decreasing of salinity (g/L) in accordance with the width of opening the barrier

25. River/Canal Location HTSma Dg-HT M10-Ht M20-HT M30-HT M40-HT M50-HT M60-HT M70-HT
Dong Nai Bridge 0.56 -0.39 -0.28 -0.26 -0.22 -0.2 -0.2 -0.19 -0.17
1.42 -0.62 -0.48 -0.49 -0.42 -0.4 -0.4 -0.39 -0.38
Dong Nai-Cat Lai 5.94 3.17 1.47 0 -0.45 -0.93 -1.11 -1.19 -1.19
Ddo 7.72 5.69 2.31 0.12 -0.59 -1.12 -1.37 -1.5 -1.48
7.72 5.74 2.35 0.15 -0.58 -1.1 -1.35 -1.49 -1.47
Nha Be 11.61 11.77 5.74 1.58 -0.54 -1.82 -2.77 -3.01 -2.65
15.94 5.31 -1.51 -3.63 -3.56 -3.48 -3.09 -3.12 -2.56
22.9 -2.47 -3.92 -3.65 -4.19 -4.06 -3.47 -3.4 -2.6
25.03 -11.02 -3.87 -3.13 -2.34 -1.88 -1.51 -1.55 -1.18
Upstream of Soai Rap barrier25.44 -17.28 -2.83 -2.42 -1.8 -1.45 -1.2 -1.26 -0.95
Downstream of Soai Rap barrier25.47 0.57 -2.84 -2.42 -1.81 -1.46 -1.21 -1.27 -0.96
Nha Be - Long Tau 11.62 11.82 5.8 1.65 -0.42 -1.73 -2.72 -3.15 -2.67
14.2 10.61 6.16 3.12 2.09 1.18 0.23 -0.2 -0.41
12.04 12.32 7.28 4.21 2.63 1.77 0.33 -0.07 -0.41
14.96 9.96 5.72 3.68 2.83 2.17 0.75 0.56 0.3
18.87 7.21 4.16 2.06 1.41 0.78 0.08 -0.15 -0.31
Chu Y Bridge 9.76 3.91 -0.27 -1.9 -2.03 -2.23 -2.09 -2.16 -1.91
11.36 6.21 1.2 -0.93 -1.25 -1.68 -1.69 -1.89 -1.74
This waterway 13.95 3.44 -1.64 -2.99 -2.66 -2.7 -2.37 -2.46 -2.15
19.33 0.06 -4.51 -4.86 -4.11 -4.03 -2.92 -2.68 -2.18
Close to Vam Co 19.93 -2.19 -6.11 -6.42 -4.9 -4.71 -3.01 -2.58 -1.94
Ben Luc river-from Vam Co20.7 -5.86 -7.78 -7.01 -4.92 -4.61 -3.1 -2.53 -1.94
13.97 0.83 -3.88 -4.37 -3.44 -3.43 -2.63 -2.31 -1.83
12.72 2.14 -2.72 -3.67 -3.05 -3.03 -2.5 -2.28 -1.84
Ben Luc river-Upstream Can Giuoc11.81 3.78 -1.7 -3.04 -2.73 -2.75 -2.38 -2.22 -1.85
Ben Luc river:
from Vam Co to
upstream of Can
Giuoc river
Dong Nai-Nha Be-
Soai Rap Rivers
Long Tau river:
from Nha Be
interflow
The waterway
from Chu Y
bridge to Vam
Co river
SIMULATION OF SALINITY IN THE DRY SEASON 2008
The increasing or decreasing of salinity (g/L) in accordance with the width of opening the barrier (cont.)

26. REMARKS ON DRY SEASON
• AS LITTLE OPENING OF SOAI RAP TIDAL BARRIER AS
SIGNIFICANT IN DECREASING OF WATER LEVEL INSIDE
• AS BIG OPENING OF SOAI RAP TIDAL BARRIER AS LITTLE
INCREASING OF SALT INTRUSION AT MY THO AND LITTLE
DECREASING OF SALT INTRUSION IN ENTIRE RIVERS
SYSTEM (SAI GON – DONG NAI – VAM CO).
• As closing or opening tidal barrier 100 m in dry season, salinity
of Sai Gon – Dong Nai Rivers and at My Tho increased.
• Water level decreased towards the South
• OPENING TIDAL BARRIER IS OPTED TO DECREASE SALT
INTRUSION AND TIDE LEVEL IN THE INTIRE SYSTEM (SAI
GON – DONG NAI – VAM CO), TO BE LITTLE IMPACT ON TIEN
GIANG AREA:
TEMPORARILY OPT TO OPEN TIDAL
BARRIER 400 M FROM JANUARY TO THE
END OF MAY

27. Simulated options for rainy season (2000)
• Existing situation 2000: Represented by HT
• Open Soai Rap tidal barrier in according to the width of 300, 400,
500 (m) are C3, C4, C5
• The representative signs used in simulated tables of rainy season:
HTHmax is existing H max.
• C1-HT,C1.5-HT,C2-HT,C3-HT, C4-HT, C5-HT, C6-HT,C7-HT are
comparisons of increasing (+) and decreasing (-) with existing (HT)
for the cases of opening 100 m (C1), 150 m (C1.5), 200 m (C2),…
• C5D1-HT, C6D1, C7D1 are the cases of opening 500, 600, 700 m in
one way of upstream to downstream only.
• 2C5-HT, 2C6-HT, 2C7-HT are the cases of opening two ways of 100
m for waterway, meanwhile also opening one way of upstream to
downstream in line with 500m, 600m, 700m for releasing discharge
objective.

28. SIMULATION OF WATER LEVEL JAN-MAY/2000
River/Canal Location HTHma C3-HT C4-HT C5-HT
My Tho-Cho Gao 1.28 -0.01 -0.01 -0.01
1.04 -0.2 -0.16 -0.12
Cho Gao-Vam Co 0.98 -0.19 -0.16 -0.12
Tuyen Nhon 0.89 -0.07 -0.05 -0.04
0.88 -0.09 -0.06 -0.05
VCT-VCD interflow 0.85 -0.1 -0.07 -0.06
Ben Luc 0.73 -0.08 -0.06 -0.05
VCT-VCD interflow 0.85 -0.1 -0.07 -0.06
1.08 -0.27 -0.22 -0.18
Vam Co-Soai Rap 1.25 -0.41 -0.34 -0.3
Sai Gon River: Thi Tinh 1.15 -0.19 -0.15 -0.11
Thu Dau Mot 1.14 -0.19 -0.14 -0.11
Thanh Da 1.11 -0.19 -0.14 -0.11
Tan Thuan 1.13 -0.22 -0.17 -0.13
1.15 -0.23 -0.18 -0.14
Den Do (Sai Gon River) 1.16 -0.24 -0.19 -0.15
Can Giuoc 0.97 -0.18 -0.14 -0.11
1.12 -0.27 -0.22 -0.18
Vam Co Tay
river
Can Giuoc
river
Vam Co Dong
river-Soai Rap
interflow
Sai Gon River:
from Thi Tinh
to Den Do
Cho Gao
canal
The increasing or decreasing of water level (m) in accordance with the width of opening the barrier

29. SIMULATION OF WATER LEVEL IN FLOOD PERIOD JAN-MAY/2000
River/Canal Location HTHma C3-HT C4-HT C5-HT
Dong Nai bridge 1.24 -0.23 -0.18 -0.14
Dong Nai River: Cat Lai 1.15 -0.22 -0.16 -0.13
Den Do (Dong Nai River) 1.16 -0.24 -0.19 -0.15
Nha Be 1.17 -0.25 -0.2 -0.16
1.26 -0.35 -0.28 -0.24
1.31 -0.4 -0.34 -0.29
1.44 -0.56 -0.49 -0.43
Upstream Soai Rap barrier1.47 -0.59 -0.52 -0.45
Downstream Soai Rap barrier1.47 0.01 0.01 0.01
Long Tau (Nha Be) 1.17 -0.25 -0.2 -0.16
1.26 -0.23 -0.18 -0.14
1.56 -0.04 -0.04 -0.03
1.53 -0.03 -0.02 -0.02
Chu Y bridge 1.11 -0.22 -0.17 -0.13
This waterway 1.12 -0.27 -0.22 -0.18
Nearby Vam Co river 1.11 -0.29 -0.23 -0.19
Ben Luc (VCD) 0.79 -0.1 -0.08 -0.06
0.94 -0.17 -0.13 -0.1
Ben Luc (Can Giuoc river) 0.97 -0.18 -0.14 -0.11
The
waterway
from Chu Y
bridge to
Ben Luc river:
from Vam Co
Dong to
upstream
Along Dong
Nai, Nha Be,
Soai Rap
Rivers
Long Tau
river: from
Nha Be
interflow
towards the
Sea
The increasing or decreasing of water level (m) in accordance with the width of opening the barrier (cont.)

30. SIMULATION OF WATER LEVEL IN FLOOD PERIOD JUN-AUG/2000
River/Canal Location HTHma C1-HT C1.5-HT C2-HT C3-HT
My Tho-Cho Gao 1.49 0 0 0 0
1.13 -0.29 -0.28 -0.28 -0.2
Cho Gao-Vam Co 1.11 -0.28 -0.28 -0.27 -0.19
Tuyen Nhon 1.52 0.05 0.02 -0.01 -0.05
1.07 -0.12 -0.13 -0.13 -0.11
1.05 -0.11 -0.12 -0.13 -0.1
0.99 -0.14 -0.14 -0.14 -0.11
VCT-VCD interflow 0.98 -0.14 -0.14 -0.14 -0.11
Ben Luc 0.8 -0.16 -0.16 -0.15 -0.09
0.88 -0.16 -0.17 -0.16 -0.11
VCT-VCD interflow 0.98 -0.14 -0.14 -0.14 -0.11
1.18 -0.34 -0.34 -0.33 -0.23
Vam Co-Soai Rap 1.26 -0.42 -0.4 -0.39 -0.28
Sai Gon River: Thi Tinh 1.24 -0.22 -0.22 -0.2 -0.13
Thu Dau Mot 1.24 -0.24 -0.24 -0.21 -0.14
Thanh Da 1.22 -0.27 -0.27 -0.22 -0.15
Tan Thuan 1.22 -0.28 -0.28 -0.25 -0.16
1.23 -0.29 -0.29 -0.25 -0.17
Sai Gon River: Den Do 1.23 -0.29 -0.28 -0.25 -0.16
Can Giuoc 1.06 -0.24 -0.24 -0.22 -0.15
1.2 -0.32 -0.32 -0.31 -0.22
Can Giuoc river
Vam Co Dong
river: from Ben
Luc to Soai Rap
interflow
Sai Gon River:
from Thi Tinh to
Den Do
Cho Gao canal
Vam Co Tay
river: from
Tuyen Nhon to
the interflow
The increasing or decreasing of water level (m) in accordance with the width of opening the barrier

31. River/Canal Location HTHma C1-HT C1.5-HT C2-HT C3-HT
Dong Nai bridge 1.34 -0.26 -0.25 -0.23 -0.16
Dong Nai River: Cat Lai 1.24 -0.28 -0.28 -0.24 -0.16
1.24 -0.29 -0.29 -0.25 -0.16
Dong Nai River: Den Do 1.23 -0.29 -0.28 -0.25 -0.16
1.23 -0.29 -0.28 -0.25 -0.16
Nha Be 1.23 -0.3 -0.29 -0.26 -0.17
1.31 -0.39 -0.38 -0.37 -0.26
1.32 -0.41 -0.41 -0.39 -0.28
1.35 -0.5 -0.49 -0.46 -0.34
Upstream Soai Rap barrier1.36 -0.52 -0.51 -0.47 -0.35
Downstream Soai Rap barrier1.36 0.01 0.01 0.01 0
Long Tau (Nha Be) 1.23 -0.3 -0.29 -0.26 -0.17
1.29 -0.25 -0.22 -0.2 -0.13
1.43 -0.04 -0.04 -0.03 -0.02
1.43 -0.05 -0.04 -0.04 -0.03
Close to the estuary 1.4 -0.02 -0.02 -0.01 -0.01
Chu Y bridge 1.2 -0.28 -0.29 -0.26 -0.17
1.2 -0.31 -0.31 -0.29 -0.2
This waterway 1.2 -0.32 -0.32 -0.31 -0.22
Close to Vam Co river 1.19 -0.34 -0.34 -0.32 -0.23
Ben Luc (VCD) 0.88 -0.16 -0.17 -0.16 -0.11
0.94 -0.19 -0.2 -0.18 -0.12
Ben Luc (Can Giuoc) 1.06 -0.24 -0.24 -0.22 -0.15
The
waterway
from Chu Y
bridge to
Ben Luc
river: from
VCD to
Along Dong
Nai, Nha Be,
Soai Rap
Rivers
Long Tau
River: from
Nha Be
interflow
towards the
SIMULATION OF WATER LEVEL IN FLOOD PERIOD JUN-AUG/2000
The increasing or decreasing of water level (m) in accordance with the width of opening the barrier (cont.)

32. River/Canal Location HtHma C4-HT C4D1-HT C5-HT 2C5-HTC5D1-HT C6-HT 2C6-HTC6D1-HT C7-HT 2C7-HT C7D1-HT
My Tho-Cho Gao 1.97 0 0 0 0 0 0 0 0 0 0 0
1.54 -0.07 -0.34 -0.06 -0.27 -0.35 -0.05 -0.28 -0.37 -0.04 -0.29 -0.37
1.48 -0.08 -0.31 -0.07 -0.3 -0.32 -0.05 -0.3 -0.34 -0.04 -0.3 -0.34
Cho Gao-Vam Co 1.47 -0.08 -0.3 -0.07 -0.29 -0.32 -0.06 -0.29 -0.33 -0.05 -0.29 -0.34
Tuyen Nhon 2.48 0.01 -0.03 0 -0.04 -0.04 0 -0.05 -0.06 0 -0.05 -0.07
1.52 -0.04 -0.21 -0.04 -0.2 -0.22 -0.03 -0.2 -0.23 -0.03 -0.2 -0.23
1.47 -0.04 -0.21 -0.04 -0.19 -0.23 -0.03 -0.19 -0.25 -0.03 -0.2 -0.24
VCT-VCD interflow 1.45 -0.05 -0.25 -0.05 -0.23 -0.27 -0.04 -0.24 -0.29 -0.03 -0.24 -0.28
Ben Luc 1.19 -0.03 -0.19 -0.03 -0.18 -0.22 -0.02 -0.18 -0.23 -0.02 -0.18 -0.23
1.42 -0.05 -0.25 -0.04 -0.23 -0.27 -0.04 -0.23 -0.29 -0.03 -0.23 -0.28
VCT-VCD interflow 1.45 -0.05 -0.25 -0.05 -0.23 -0.27 -0.04 -0.24 -0.29 -0.03 -0.24 -0.28
1.53 -0.1 -0.37 -0.09 -0.36 -0.38 -0.07 -0.36 -0.4 -0.06 -0.36 -0.4
Vam Co-Soai Rap 1.59 -0.12 -0.44 -0.1 -0.42 -0.44 -0.08 -0.42 -0.46 -0.06 -0.43 -0.46
Sai Gon: Thi Tinh 1.57 -0.03 -0.35 -0.03 -0.24 -0.37 -0.02 -0.24 -0.39 -0.02 -0.25 -0.4
Thu Dau Mot 1.55 -0.03 -0.35 -0.03 -0.24 -0.38 -0.02 -0.24 -0.39 -0.02 -0.25 -0.4
Thanh Da 1.51 -0.03 -0.34 -0.03 -0.24 -0.36 -0.02 -0.25 -0.38 -0.02 -0.26 -0.38
Tan Thuan 1.53 -0.05 -0.37 -0.04 -0.28 -0.38 -0.04 -0.28 -0.4 -0.03 -0.29 -0.4
1.53 -0.05 -0.37 -0.04 -0.28 -0.38 -0.03 -0.28 -0.4 -0.03 -0.29 -0.4
Den Do (Sai Gon) 1.54 -0.05 -0.38 -0.04 -0.29 -0.4 -0.04 -0.29 -0.41 -0.03 -0.3 -0.41
Can Giuoc 1.42 -0.05 -0.3 -0.05 -0.27 -0.32 -0.04 -0.27 -0.33 -0.03 -0.28 -0.33
1.53 -0.08 -0.37 -0.07 -0.33 -0.39 -0.05 -0.33 -0.4 -0.04 -0.35 -0.41
Can Giuoc
river
Cho Gao canal
Vam Co Tay
river
Vam Co Dong:
from Ben Luc
to Soai Rap
interflow
Sai Gon River:
from Thi Tinh
to Den Do
SIMULATION OF WATER LEVEL IN FLOOD PERIOD SEPT-DEC/2000
The increasing or decreasing of water level (m) in accordance with the width of opening the barrier

33. River/Canal Location HtHma C4-HT C4D1-HT C5-HT 2C5-HTC5D1-HT C6-HT 2C6-HTC6D1-HT C7-HT 2C7-HT C7D1-HT
Dong Nai bridge 1.69 -0.06 -0.42 -0.05 -0.29 -0.44 -0.04 -0.3 -0.47 -0.03 -0.31 -0.47
1.63 -0.04 -0.39 -0.03 -0.27 -0.42 -0.03 -0.28 -0.44 -0.02 -0.29 -0.45
Dong Nai: Cat Lai 1.55 -0.05 -0.37 -0.04 -0.28 -0.4 -0.03 -0.28 -0.41 -0.03 -0.29 -0.42
1.54 -0.05 -0.37 -0.04 -0.28 -0.39 -0.03 -0.28 -0.41 -0.03 -0.29 -0.41
Den Do (Dong Nai) 1.54 -0.05 -0.38 -0.04 -0.29 -0.4 -0.04 -0.29 -0.41 -0.03 -0.3 -0.41
Nha Be 1.54 -0.06 -0.39 -0.05 -0.3 -0.4 -0.04 -0.3 -0.41 -0.03 -0.31 -0.42
1.59 -0.08 -0.44 -0.07 -0.36 -0.45 -0.05 -0.36 -0.46 -0.04 -0.37 -0.47
1.61 -0.1 -0.45 -0.08 -0.38 -0.47 -0.06 -0.38 -0.48 -0.05 -0.4 -0.49
1.62 -0.11 -0.46 -0.09 -0.4 -0.48 -0.07 -0.4 -0.49 -0.05 -0.41 -0.5
1.63 -0.11 -0.47 -0.09 -0.42 -0.49 -0.07 -0.42 -0.5 -0.06 -0.43 -0.51
1.63 -0.13 -0.48 -0.11 -0.44 -0.48 -0.08 -0.44 -0.5 -0.07 -0.46 -0.51
1.63 -0.13 -0.48 -0.11 -0.45 -0.48 -0.08 -0.45 -0.5 -0.07 -0.46 -0.51
Upstream Soai Rap barrier1.67 -0.19 -0.5 -0.15 -0.5 -0.52 -0.13 -0.51 -0.54 -0.11 -0.52 -0.54
Downstream Soai Rap barrier1.67 0.01 -0.01 0.01 0 0 0.01 0 0 0.01 0 0
Long Tau (Nha Be) 1.54 -0.06 -0.39 -0.05 -0.3 -0.4 -0.04 -0.3 -0.41 -0.03 -0.31 -0.42
1.6 -0.04 -0.32 -0.04 -0.22 -0.35 -0.03 -0.22 -0.36 -0.02 -0.23 -0.37
1.76 -0.02 -0.07 -0.02 -0.05 -0.07 -0.02 -0.05 -0.07 -0.02 -0.05 -0.07
1.77 -0.03 -0.08 -0.03 -0.06 -0.08 -0.03 -0.06 -0.08 -0.03 -0.07 -0.08
1.73 -0.01 -0.03 -0.01 -0.03 -0.04 -0.01 -0.03 -0.04 -0.01 -0.03 -0.04
Chu Y bridge 1.51 -0.05 -0.35 -0.04 -0.28 -0.37 -0.03 -0.28 -0.38 -0.03 -0.29 -0.38
This waterway 1.53 -0.08 -0.37 -0.07 -0.33 -0.39 -0.05 -0.33 -0.4 -0.04 -0.35 -0.41
1.53 -0.09 -0.37 -0.07 -0.34 -0.38 -0.06 -0.34 -0.4 -0.04 -0.35 -0.4
Close to Vam Co 1.54 -0.1 -0.38 -0.09 -0.36 -0.39 -0.07 -0.36 -0.41 -0.06 -0.37 -0.41
Ben Luc (VCD) 1.29 -0.04 -0.22 -0.03 -0.2 -0.24 -0.03 -0.21 -0.26 -0.02 -0.21 -0.25
1.39 -0.04 -0.28 -0.04 -0.26 -0.3 -0.03 -0.26 -0.31 -0.02 -0.26 -0.31
Ben Luc (Can Giuoc) 1.42 -0.05 -0.3 -0.05 -0.27 -0.32 -0.04 -0.27 -0.33 -0.03 -0.28 -0.33
Ben Luc river:
from VCD to
upstream Can
Giuoc river
Along Dong
Nai, Nha Be,
Soai Rap
Rivers
Long Tau river:
from Nha Be
interflow
towards the
Sea
The waterway
Chu Y bridge
to Vam Co
river
SIMULATION OF WATER LEVEL IN FLOOD PERIOD SEPT-DEC/2000
The increasing or decreasing of water level (m) in accordance with the width of opening the barrier (cont.)

34. SIMULATION OF FLOW VELOCITY IN FLOOD PERIOD SEPT-DEC/2000
River/Canal Location HTUma C4-HT C41D-HT C5-HT C51D-HT C6-HT C61D-Ht C7-HT C71D-HT
My Tho-Cho Gao 0.2 0.02 0.07 0.02 0.08 0.01 0.08 0.01 0.08
0.72 -0.02 0.16 -0.01 0.18 -0.01 0.2 -0.01 0.21
Cho Gao-Vam Co 0.42 -0.05 -0.04 -0.04 -0.02 -0.03 -0.02 -0.03 -0.01
Tuyen Nhon 1.16 -0.09 -0.07 -0.07 -0.05 -0.05 -0.04 -0.04 -0.02
0.74 -0.07 -0.07 -0.05 -0.05 -0.04 -0.04 -0.03 -0.03
VCT-VCD interflow 0.16 -0.03 -0.03 -0.02 -0.03 -0.02 -0.02 -0.01 -0.02
Vam Co Dong 0.51 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1
Ben Luc 0.45 0.12 0.12 0.12 0.12 0.12 0.12 0.12 0.12
VCD-VCT interflow 0.22 0.07 0.07 0.07 0.07 0.07 0.07 0.07 0.07
1.59 -0.45 -0.47 -0.37 -0.39 -0.3 -0.33 -0.25 -0.28
Vam Co-Soai Rap 1.59 -0.55 -0.56 -0.45 -0.47 -0.37 -0.4 -0.3 -0.35
Sai Gon-Thi Tinh 0.61 -0.12 -0.15 -0.1 -0.12 -0.08 -0.11 -0.06 -0.09
Thu Dau Mot 0.61 -0.12 -0.14 -0.09 -0.12 -0.07 -0.1 -0.06 -0.09
Thanh Da 0.71 -0.15 -0.18 -0.12 -0.15 -0.09 -0.12 -0.07 -0.11
Tan Thuan 0.77 -0.2 -0.22 -0.15 -0.18 -0.12 -0.16 -0.1 -0.13
0.86 -0.24 -0.27 -0.19 -0.22 -0.15 -0.19 -0.12 -0.16
Den Do (Sai Gon) 0.9 -0.25 -0.28 -0.2 -0.24 -0.16 -0.2 -0.13 -0.17
Can Giuoc river Cam Giuoc 0.61 -0.16 -0.19 -0.12 -0.15 -0.09 -0.13 -0.07 -0.11
0.66 -0.24 -0.26 -0.19 -0.22 -0.15 -0.19 -0.12 -0.15
Cho Gao canal
Vam Co Tay
river
Vam Co Dong
river: from Ben
Luc to Soai Rap-
Nha Be-Vam Co
interflow
Sai Gon River:
from Thi Tinh to
Den Do
interflow
The increasing or decreasing of max flow velocity (m/s) in accordance with the width of opening the barrier

35. River/Canal Location HTUma C4-HT C41D-HT C5-HT C51D-HT C6-HT C61D-Ht C7-HT C71D-HT
Dong Nai bridge 0.57 -0.09 -0.1 -0.07 -0.08 -0.05 -0.07 -0.04 -0.06
Dong Nai-Cat Lai 0.92 -0.21 -0.25 -0.17 -0.22 -0.14 -0.18 -0.11 -0.16
Den Do 1.03 -0.25 -0.3 -0.2 -0.26 -0.16 -0.22 -0.13 -0.19
1.04 -0.29 -0.34 -0.23 -0.28 -0.19 -0.24 -0.15 -0.21
Nha Be 0.77 -0.21 -0.24 -0.17 -0.2 -0.13 -0.18 -0.11 -0.15
1.07 -0.49 -0.57 -0.42 -0.48 -0.35 -0.42 -0.3 -0.37
0.94 -0.44 -0.49 -0.38 -0.43 -0.32 -0.37 -0.27 -0.33
1.19 -0.59 -0.61 -0.51 -0.53 -0.45 -0.47 -0.4 -0.42
1.39 -0.77 -0.79 -0.65 -0.68 -0.55 -0.59 -0.47 -0.52
Upstream Soai Rap barrier1.53 -0.88 -0.9 -0.76 -0.79 -0.65 -0.69 -0.56 -0.61
Downstream Soai Rap barrier1.6 -0.75 -0.79 -0.62 -0.67 -0.51 -0.57 -0.43 -0.49
Nha Be-Long Tau 1.11 0.41 0.41 0.41 0.41 0.41 0.41 0.41 0.41
1.09 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25
1.51 0.2 0.08 0.16 0.02 0.12 -0.02 0.1 -0.04
0.82 0.03 -0.03 0.02 -0.06 0.01 -0.07 0 -0.05
0.92 0.03 -0.02 0.02 -0.03 0.01 -0.04 0.01 -0.04
0.84 0 -0.03 0 -0.04 0 -0.04 0 -0.04
Chu Y bridge 0.31 -0.05 -0.09 -0.04 -0.08 -0.03 -0.08 -0.03 -0.07
This waterway 0.58 -0.08 -0.18 -0.06 -0.16 -0.05 -0.15 -0.04 -0.15
Close to Vam Co 0.39 -0.11 -0.16 -0.08 -0.13 -0.07 -0.1 -0.05 -0.08
Ben Luc-Vam Co 0.27 -0.03 -0.03 -0.02 -0.03 -0.02 -0.02 -0.01 -0.02
0.56 -0.07 -0.08 -0.05 -0.06 -0.04 -0.05 -0.03 -0.05
0.57 -0.09 -0.1 -0.07 -0.08 -0.05 -0.07 -0.04 -0.06
Ben luc-Can Giuoc 0.49 -0.11 -0.12 -0.08 -0.1 -0.06 -0.08 -0.05 -0.07
Dong Nai, Nha
Be, Soai Rap
Rivers: DN-from
Dong Nai
bridge, NB-from
Den Do
interflow, Soai
Rap-from Nha
Be-Soai Rap-
Vam Co
interflow
Long Tau river:
from Nha Be
interflow
towards the Sea
The waterway
Chu Y bridge to
Vam Co river
Ben Luc river:
from Vam Co to
Can Giuoc
SIMULATION OF FLOW VELOCITY IN FLOOD PERIOD SEPT-DEC/2000
The increasing or decreasing of max flow velocity (m/s) in accordance with the width of opening the barrier

36. River/Canal Location HtUmi C4-HT C41D-HT C5-HT C51D-HT C6-HT C61D-Ht C7-HT C71D-HT
My Tho-Cho Gao -0.06 -0.11 -0.11 -0.11 -0.11 -0.11 -0.11 -0.11 -0.11
-0.53 0.02 0.09 0.01 0.09 0.01 0.09 0 0.09
Cho Gao-Vam Co -0.34 0.05 0.14 0.04 0.15 0.03 0.15 0.03 0.15
Tuyen Nhon -0.26 0.13 0.27 0.1 0.27 0.08 0.26 0.06 0.26
-0.24 0.08 0.17 0.06 0.16 0.05 0.16 0.04 0.16
VCT-VCD interflow -0.09 0.03 0.06 0.03 0.06 0.02 0.06 0.02 0.06
Vam Co Dong -0.84 0.04 0.12 0.04 0.12 0.03 0.12 0.02 0.13
Ben Luc -0.89 0.06 0.16 0.05 0.16 0.04 0.17 0.03 0.17
VCD-VCT interflow -0.51 0.07 0.13 0.06 0.13 0.04 0.13 0.03 0.13
-0.95 0.31 0.6 0.25 0.59 0.2 0.58 0.17 0.58
Vam Co-Soai Rap -0.92 0.32 0.6 0.26 0.59 0.22 0.59 0.18 0.58
Sai Gon-Thi Tinh -0.31 0.06 0.12 0.05 0.12 0.04 0.12 0.03 0.12
Thu Dau Mot -0.41 0.08 0.16 0.07 0.16 0.06 0.15 0.05 0.15
Thanh Da -0.6 0.12 0.22 0.1 0.21 0.08 0.21 0.06 0.2
Tan Thuan -0.55 0.11 0.21 0.08 0.2 0.07 0.2 0.05 0.19
-0.62 0.14 0.26 0.11 0.25 0.09 0.24 0.07 0.23
Den Do-Sai Gon -0.64 0.14 0.27 0.11 0.25 0.09 0.25 0.07 0.24
Can Giuoc -0.65 0.15 0.33 0.12 0.33 0.1 0.33 0.08 0.34
-0.6 0.14 0.33 0.11 0.33 0.09 0.33 0.07 0.33
Can Giuoc River
Cho Gao canal
Vam Co Tay
river
VCD: from Ben
Luc to Soai Rap-
Nha Be-Vam Co
interflow
Sai Gon River:
from Thi Tinh to
Den Do
interflow
SIMULATION OF FLOW VELOCITY IN FLOOD PERIOD SEPT-DEC/2000
The increasing or decreasing of min flow velocity (m/s) in accordance with the width of opening the barrier

37. River/Canal Location HTUma C4-HT C41D-HT C5-HT C51D-HT C6-HT C61D-Ht C7-HT C71D-HT
Dong Nai bridge -0.52 0.11 0.2 0.08 0.19 0.07 0.18 0.05 0.18
Dong Nai-Cat Lai -0.85 0.17 0.32 0.13 0.3 0.1 0.29 0.08 0.28
Den Do -0.9 0.17 0.34 0.13 0.33 0.1 0.31 0.08 0.31
-0.83 0.17 0.34 0.13 0.32 0.1 0.31 0.08 0.31
Nha Be -0.64 0.13 0.28 0.1 0.27 0.08 0.26 0.07 0.25
-0.88 0.23 0.5 0.21 0.51 0.17 0.51 0.14 0.51
-0.74 0.19 0.41 0.16 0.42 0.14 0.42 0.11 0.42
-0.98 0.28 0.57 0.24 0.6 0.2 0.6 0.16 0.58
-0.75 0.33 0.68 0.28 0.72 0.23 0.73 0.19 0.72
Upstream Soai Rap barrier-0.78 0.33 0.65 0.28 0.7 0.23 0.73 0.19 0.72
Downstream Soai Rap barrier-0.95 0.41 0.78 0.35 0.84 0.29 0.88 0.24 0.88
Nha Be-Long Tau -0.75 -0.1 -0.53 -0.08 -0.58 -0.07 -0.61 -0.06 -0.62
-0.67 -0.06 -0.36 -0.05 -0.4 -0.04 -0.43 -0.04 -0.44
-0.78 0.09 -0.07 0.06 -0.1 0.04 -0.12 0.03 -0.13
-0.72 0.11 -0.01 0.08 -0.04 0.06 -0.06 0.05 -0.07
-0.91 0.14 0.08 0.11 0.04 0.08 0.01 0.07 0
-0.7 0.03 0.02 0.03 0.01 0.02 0.01 0.02 0.01
Chu Y bridge -0.45 0.12 0.2 0.11 0.19 0.09 0.19 0.07 0.19
This waterway -0.76 0.15 0.18 0.12 0.16 0.1 0.14 0.07 0.13
Close to Vam Co -0.51 0.11 0.18 0.09 0.17 0.07 0.16 0.05 0.15
Ben Luc-Vam Co -0.26 0.05 0.11 0.04 0.11 0.03 0.11 0.02 0.11
-0.49 0.08 0.18 0.06 0.18 0.05 0.18 0.04 0.18
-0.51 0.09 0.18 0.07 0.17 0.06 0.18 0.05 0.18
Ben Luc-Can Giuoc -0.42 0.08 0.15 0.06 0.15 0.05 0.15 0.04 0.15
Ben Luc river:
from Vam Co to
Can Giuoc river
Dong Nai, Nha
Be, Soai Rap
Rivers: DN-from
Dong Nai
bridge, NB-from
Den Do
interflow, Soai
Rap-from Nha
Be-Soai Rap-
Vam Co
interflow
Long Tau river:
from Nha Be
interflow
towards the Sea
The waterway
Chu Y bridge to
Vam Co river
SIMULATION OF FLOW VELOCITY IN FLOOD PERIOD SEPT-DEC/2000
The increasing or decreasing of min flow velocity (m/s) in accordance with the width of opening the barrier

38. REMARKS ON SIMULATION RESULTS IN FLOOD PERIOD
• WATER LEVEL IN THE NETWORK DECREASED FROM 25 cm TO 50
cm, IN CASE OF 1 WAY OPERATION OF BARRIER TO DISCHARGE TO
THE SEA.
• ALWAYS OPENED MINIMUM 100 M WHOLE YEAR TO MAKE SURE OF
WATERWAY TRANSPORTATION AND DECREASE WATER LEVEL &
SALT INTRUSION AS WELL.
• AS CLOSE TO THE SOUTH AS DECREASED IN WATER LEVEL, MORE
ADVANTAGEOUS FOR RELEASING DISCHARGE.
• FLOW VELOCITY IN THE WHOLE NETWORK DECREASED; EXCEPT
THE CASE AT UPSTREAM LONG TAU, THE FLOW TO DOWNSTREAM
INCREASED MAX 0.4 m/s BUT IT DOES NOT EXCEED 1.5 m/s.
• THE BARRIER OPENED OVER 700 M, IT IS NOT EFFECTIVE IN
DECREASING WATER LEVEL (the option 1500 m of flood and
inundation management team MARD is not effective)

39. Advantage and disadvantage of Soai Rap tidal barrier
Operation procedure:
• From Jan to end May: Open the barrier 400 m to allow 2 in-out
flow
• From Jun to end Aug: Open the barrier 150 m to allow 2 in-out
flow
• From Sept to end Dec: Open the barrier 100 m, + open 500-600
m to discharge one way to downstream at neap tide period and
control water level at spring tide period. (No need shiplock for
waterway transportation)
=> No obstruction in waterway transportation at Soai Rap (open
minimum 100 m), Long Tau, Thi Vai and the inland waterway
from HCMC to Mekong Delta

40. • Only 1 tidal barrier with the total width maximum
800/1000 m
• Easy to prepare the operation and management
procedure
• No effect to environment at Can Gio
• Decrease maximum tide level in the network (SG-DN-VC)
in order to flood and inundation management for HCMC
=> decrease dike crest (in case the dike is necessary).
• As close to the South as decreased a lot in water level, it
is easy for releasing discharge
• Decrease salinity in Go Cong 4-5 g/L
• Decrease salinity in Sai Gon and Dong Nai Rivers and
decrease the hazard of salt intrusion for drinking water
treatment plants supplying to HCMC
• Far away to the inland: it does not change the hydraulic
regime of Can Gio, Dai and Tieu estuaries
Advantage and disadvantage of Soai Rap tidal barrier (cont.)

41. RELATION TO 12 TIDAL GATES APPROVED
(DECISION No. 1547)
1- Rach Tra ?
2- Vam Thuat
3- Ben Nghe
4- Tan Thuan
5- Phu Xuan
6- Muong Chuoi
7- Song Kinh
8- Kinh Lo
9- Kinh Hang
10- Thu Bo
11- Ben Luc
12- Kinh Xang

42. RELATION TO 12 TIDAL GATES APPROVED
(DECISION No. 1547) – cont.
• The role of 6 tidal gates (from 1 to 6) is to control
water level coming in HCMC as significantly high
discharge (design discharge), hence it can be
studied more later on. For the case of Rach Tra tidal
gate, the canal can be widen to release discharge (no
need tidal gate)
• The tidal gates in the South and in Long An are not
necessary as Soai Rap tidal barrier always maintains
low water level
• Flood in 2000: No need tidal gates, the water level
was also decreased in Sai Gon – Dong Nai – Vam Co
Rivers

43. THE IMPACT OF SEA LEVEL RISE
BUILDING THE COUPLING MODEL 1-2D TO SIMULATE THE IMPACT
OF SEA LEVEL RISE

44. SOME RESULTS OF IMPACT SIMULATION OF
SEA LEVEL RISE
Max water level of March-2020 at 8 river mouth stations
coressponding to 3 cases: normal (BT), MSL rise (NBD) and MSL
rise+3 sluice gates (3CONBD)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
Vàm
Kênh
Bình
Đại
An
Thuận
B ến
Trại
M ỹ
Thanh
Gành
Hào
Ô Đốc Biện
Nhị
Rạch
Giá
River mouth Stations
MaxWL(m)
BT
NBD
3CONBD
Max Slinity of April 2020 at 8 river mouth station corresponding to
cases (Normal, MSL rise, 3 sluice gates+MSLR)
10
15
20
25
30
35
Vàm
Kênh
Bình Đại An
Thuận
Bến Trại M ỹ
Thanh
Gành
Hào
Ô Đốc Biện Nhị Rạch
Giá
River mout h st at ions
MaxSalinity(g/L)
BT
NBD
3CONBD

45. 0.2
0.25
0.3
0.35
0.4
0.45
V.Kênh B.Đại A.Thuận Bến Trại Mỹ Thanh G.Hào Ô.Đốc R.Giá
Increaseofwaterlevel(m)
Location of estuaries
Change of peak - bottom water level at 8 estuaries in case of SLR 30 cm in 2050 (6 tidal
gates)
Tang Max
Tang Min
SOME RESULTS OF IMPACT SIMULATION OF
SEA LEVEL RISE

46. -3
-2
-1
0
1
2
3
4
5
6
V.Kênh B.Đại An Thuận Bến Trại M.Thanh G.Hào Ô.Đốc R.Giá
Changeofsalinity(g/L)
Location of estuaries
Increase (+) and decrease (-) salinityat 8 estuaries for the case of SLR 30 cm in
2050 and6 tidal gates
TangMax Tang Min
SOME RESULTS OF IMPACT SIMULATION OF
SEA LEVEL RISE

47. Advantages of Soairap gate (Haskoning)

48. SOME REMARKS AND RECOMMENDATION
• SOAI RAP TIDAL BARRIER BRINGS A LOT OF BENEFIT AND IT
IS FEASIBLE ON MANY APSECTS IN THE BASIN (SG-DN-VC),
SIMPLE OPERATION AND MANAGEMENT, TIDE AND FLOOD
CONTROL NOT ONLY FOR HCMC IN THE CASE OF FLOOD IN
2000C BUT ALSO NO IMPACTS ON MEKONG DELTA AND
WATERWAY TRANSPORTATION
• DECREASE SALT INTRUSION FOR GO CONG AND DRINKING
WATER TREATMENT PLANTS ALONG SAI GON – DONG NAI
RIVERS
• NEED TO BE STUDIED MORE CAREFULLY IN DESIGN
DISCHARGE, SEA LEVEL RISE AND THE ROLE OF BIG TIDAL
GATES APPROVED.
• NEED TO BE STUDIED IN TOPOGRAPHY, GEOLOGY,
GEOMETRY AND ENVIRONMENT AT TIDAL GATES.

49. TIDAL BARRIER IN THE NETHERLANDS

50. THANK YOU FOR YOUR
KIND ATTENTION !