Tóm tắt ta nghiên cứu xây dựng các giải pháp tổng hợp nâng cao hiệu quả công tác quản lý thoát nước tại thành phố cần thơ

Tóm tắt ta nghiên cứu xây dựng các giải pháp tổng hợp nâng cao hiệu quả công tác quản lý thoát nước tại thành phố cần thơ Tóm tắt ta nghiên cứu xây dựng các giải pháp tổng hợp nâng cao hiệu quả công tác quản lý thoát nước tại thành phố cần thơ Tóm tắt ta nghiên cứu xây dựng các giải pháp tổng hợp nâng cao hiệu quả công tác quản lý thoát nước tại thành phố cần thơ Tóm tắt ta nghiên cứu xây dựng các giải pháp tổng hợp nâng cao hiệu quả công tác quản lý thoát nước tại thành phố cần thơ Tóm tắt ta nghiên cứu xây dựng các giải pháp tổng hợp nâng cao hiệu quả công tác quản lý thoát nước tại thành phố cần thơ Tóm tắt ta nghiên cứu xây dựng các giải pháp tổng hợp nâng cao hiệu quả công tác quản lý thoát nước tại thành phố cần thơ

MINISTRY OF EDUCATION AND TRAINING CAN THO UNIVERSITY -o0o - SUMMARY OF DOCTORAL DISSERTATION Major: Land and Water Environment Code: 9440303 NGUYEN THANH NGAN RESEARCHING FOR BUILDING INTEGRATED SOLUTIONS TO IMPROVE THE EFFICIENCY OF DRAINAGE MANAGEMENT IN CAN THO CITY Can Tho, 2024 THIS STUDY WAS ACHIEVED AT CAN THO UNIVERSITY Supervisor: Assoc Prof Dr Nguyen Hieu Trung The dissertation is defended under the School-level Doctoral Dissertation Assessment Committee Meeting at: … Time and Date: … Reviewer 1: … Reviewer 2: … The dissertation is available at: Learning Resource Center of Can Tho University National Library Vietnam LIST OF PUBLICATIONS Nguyen Thanh Ngan, Nguyen Hieu Trung (2021) Application of Kriging Interpolation Method on Building Digital Elevation Model for Ninh Kieu and Cai Rang Districts of Can Tho City Proceedings International Conference on GeoInformatics for Spatial-Infrastructure Development in Earth and Allied Sciences GIS-IDEAS 2021, Naresuan University, ISBN: 978-4-901668-37-8, pp 219-226 Nguyen Thanh Ngan, Nguyen Hieu Trung (2021) Application of GIS for Building the Geographic Database for Ninh Kieu and Cai Rang Districts of Can Tho City Proceedings International Conference on GeoInformatics for Spatial-Infrastructure Development in Earth and Allied Sciences GIS-IDEAS 2021, Naresuan University, ISBN: 978-4-901668-37- 8, pp 364-369 Nguyen Thanh Ngan, Nguyen Hieu Trung (2021) Applying Google Earth Engine to assess the impact of urban flooding in Ninh Kieu district in the period from 2018 to 2021 42nd Asian Conference on Remote Sensing (ACRS 2021), Curran Associates, Inc., ISBN: 978-1-7138-4381-8, pp 835-842 Nguyen Thanh Ngan, Dinh Diep Anh Tuan, Nguyen Hieu Trung (2022) Application of GIS on building the spatial database for supporting drainage management in Ninh Kieu District IOP Conference Series: Earth and Environmental Science, IOP Publishing, Online ISSN: 1755-1315, 964, 012002, doi:10.1088/1755-1315/964/1/012002 Nguyen Thanh Ngan, Nguyen Hieu Trung (2023) Application of GIS and SWMM model to assess urban flooding in Metro Residential Area of Ninh Kieu District IOP Conference Series: Earth and Environmental Science, IOP Publishing, Online ISSN: 1755-1315, 1170, 012007, doi:10.1088/1755-1315/1170/1/012007 Nguyễn Thanh Ngân, Nguyễn Hiếu Trung (2022) Tổng quan hệ thống nước thị bền vững SUDS Tạp chí Khí tượng Thủy văn 2022, EME4, Tổng cục Khí tượng Thủy văn, in Cơng ty TNHH Đầu Tư Nông Nghiệp Việt Nam, ISSN Print: 2525-2208, pp 158-168, doi:10.36335/VNJHM.2022(EME4).158-168 Chapter INTRODUCE 1.1 Rationale of the research Can Tho City is one of the important economic, political, scientific, educational, social and cultural centers of South Vietnam According to Decision 889/QD-TTg issued in 2009, Can Tho City is recognized as a grade I urban center directly under the Central Government, the largest city in the Mekong Delta region (Prime Minister, 2009; General Statistics Office, 2022) In terms of natural area, Can Tho City has an area of 1,440.4 km2, accounting for 3.52% of the area of the whole region (40,921.7 km2), which is the smallest administrative unit in the Mekong Delta (General Statistics Office, 2022) In terms of population, the city has an average population of 1,247,000 with 619,100 men and 627,900 women (General Statistics Office, 2022) Population Can Tho City accounts for 7.16% of the whole region's population with 17,422,600 people (General Statistics Office, 2022) As of December 2021, the whole city has a population density of 866 people/km2, making it one of the administrative units with the highest population density in the Mekong Delta (General Statistics Office, 2022) Can Tho city is considered as a typical “dynamic city” of the Southern Region, the city's development will play a role in the development of the whole Mekong Delta region (World Bank, 2014) In the current period, along with economic growth, the phenomenon of urbanization in Can Tho City is also taking place at a fast pace and with a complicated direction This has caused great difficulties and challenges for urban managers in this area Besides urbanization, Can Tho City also faces a number of specific environmental problems such as climate change, urban flooding, sea level rise and land subsidence (World Bank, 2014) The combination of these environmental problems creates a great pressure on drainage management activities in the city The traditional method currently used in drainage management in Can Tho City cannot meet the current demand for many subjective and objective reasons To solve these problems, city managers have applied many new technologies to drainage management The city has built a digital map system for the management of infrastructure of water supply and drainage systems as well as irrigation works (Nguyen Hieu Trung, Trinh Cong Doan, 2011; Nguyen Hieu Trung et al., 2012; Nguyen Hieu Trung et al., 2014) Besides, the city has also operated WebGIS to support environmental and water resource management (Ky Quang Vinh, 2010; Nguyen Hieu Trung et al., 2011, Truong Chi Quang et al., 2013; Le Van Thanh et al., 2014) as well as applying modeling tools to drainage management activities (Nguyen Thanh Loc, 2016; Nguyen Ngoc Toan, Nguyen Dinh Giang Nam, Nguyen Vo Chau Ngan, 2021) The city government plans to renovate and build a new drainage system on 32 roads and two pumping stations in Ninh Kieu District (Tien Phong Electronic Newspaper, 2022) In addition, Can Tho City also proposes to use cameras, maps, drones, establish a network of collaborators to warn of floods, develop a planning plan that needs to take into account the topographical background (Tien Phong Electronic Newspaper, 2022) Sponsored by the World Bank and SECO, the ODA Project Management Unit in collaboration with city departments and agencies has implemented the project “Development of Can Tho City and Strengthening Urban Adaptability” (also known as Project 3) with three main components, in which Component has the content “Building a flood risk management information system for Can Tho City” named FRMIS (Can Tho City Portal, 2022) FRMIS is a support tool to help manage flood risks intelligently, automatically adjusting water levels, based on spatial data, water level data, hydrometeorological data, automatic control tools and equipments The system consists of two main parts, the FRMIS Operation Center and the SCADA system, which includes water level gauges, water quality probes, hydrometeorological probes, street cameras, data transmission system and the control system for the operation of culverts and pumping stations operates continuously all year round In addition, Project also built a shared database component that has standardized 25 data layers of sectors of Resources and Environment, Construction, Labor Invalids and Social Affairs (Traffic Electronic Newspaper, 2022) These projects show great efforts of scientists and managers in Can Tho City in renewing and improving management efficiency However, these projects have not been able to solve the existing problems with urban drainage management and flood reduction in Can Tho City Ninh Kieu and Cai Rang are the modern economic, social, political, cultural and tourist centers of Can Tho City These are two of the nine district-level administrative units of the city, established under Decree No 05/2004/ND-CP dated 02/01/2004 of the Government (Government, 2004) In the eyes of urban managers, these two central districts are considered as the development nucleus of Can Tho City, playing a role in promoting the overall development of the whole city Similar to the general characteristics of Can Tho City, the urbanization process in Ninh Kieu and Cai Rang takes place at a fast and strong speed This has made the drainage system no longer able to meet the current needs of the residential community, which has resulted in urban flooding becoming more and more serious over time This phenomenon has increased pressure as well as created great difficulties and challenges for drainage management in Ninh Kieu and Cai Rang In order to have a basis for building practical, effective and synchronous solutions to this situation, the problem is to determine the current status of drainage management, urban flooding and flooded water quality in the two urban districts, where the drainage system is rapidly deteriorating and urban flooding is complicated Because of the above reason, this research is carried out with the goal of building integrated solutions to improve the efficiency of drainage management and reduce urban flooding under the impact of uncertain factors on natural conditions and rapid socio-economic development like Can Tho City These solutions will help managers solve many outstanding problems, improve the efficiency of drainage management and reduce urban flooding in the study area The scope of the research focus mainly on solutions to manage drainage system and reduce urban flooding in the inner districts of Can Tho City because this is a very urgent problem that the city needs to solve immediately The results of the project will be the basis for improving people's quality of life and socio-economic development in Can Tho City 1.2 Research objectives 1.2.1 Overall objectives Researching for building integrated solutions to improve the efficiency of drainage management and reduce urban flooding under the impact of uncertain factors on natural conditions and rapid socio- economic development like Can Tho City 1.2.2 Specific objectives - Assessing the current status of drainage management, urban flood reduction and flooded water quality in the study area - Determining the impacts of changes in natural and socio-economic conditions on drainage management and urban flood reduction in the study area - Proposing groups of integrated solutions to improve the efficiency of drainage management and reduce urban flooding in Can Tho City 1.3 Research contents - Content 1: results of assessment of the current status of drainage management, urban flood reduction and flooded water quality in the study area - Content 2: types of impacts and magnitude of changes in natural and socio-economic conditions on drainage management and urban flood reduction in the study area - Content 3: integrated solutions to improve the efficiency of drainage management and reduce urban flooding in the study area 1.4 Scientific and practical significance 1.4.1 Scientific significance In scientific terms, the research has systematized theoretical and practical issues related to drainage management and urban flood reduction in conditions of high natural variability and urbanization like Can Tho City The research is the methodological basis, orientation and reference for further studies on urban drainage management and flood reduction that will be implemented in Can Tho City as well as in the Mekong Delta in the future The research has evaluated the applicability of the SWMM drainage model in the simulation of urban drainage and flooding Besides, the research will also be a useful scientific basis for building solutions to improve the efficiency of drainage management and reduce urban flooding in areas of similar nature 1.4.2 Practical significance In practical terms, the research has collected and built a comprehensive dataset on drainage management and urban flood reduction in Can Tho City This is a useful reference data source for future studies in the field of water supply and drainage as well as environmental science in the study area in particular and Can Tho City in general The developed drainage scenarios and the forecast results of urban flooding are a reference source for assessing the impact of urban flooding on the population in the study area, this is a source of useful information for urban managers in Can Tho City With reliable input data sources, combined with appropriate research methods, the integrated solutions built from this research will be the basis for solving the remaining problems, improving the efficiency of drainage management and reducing urban flooding, thereby reducing the impacts of flooding, contributing to stabilizing people's living conditions and ensuring stable economic development in the Can Tho City 1.5 New point of the thesis - The research proposed a scientific and integrated approach to urban flood management, including calculating flood dynamics (mathematical model), analyzing the impact of drainage infrastructure management, assessing the impact of urban communities on drainage capacity and flooded water quality under the impact of uncertain factors such as changes in the Mekong River flood regime, rainfall regime due to climate change and local socio-economic development activities - The research analyzed the feasibility and effectiveness of new solutions in reducing urban flooding according to the Green Infrastructure approach in scenarios of changes in flow and rainfall in the future under impact of climate change Through integrating this Green Infrastructure solution into mathematical models and Geographic Information Systems to quantitatively analyze the spatial distribution and flooding time of the study area Thereby quantifying the effectiveness of the solution, creating a scientific foundation for making flood management decisions as well as planning and designing urban residential areas in the Mekong Delta Chapter SUBJECTS AND METHODOLOGY 2.1 Research subjects and scope 2.1.1 Research subjects - Processes in urban drainage management and flood reduction in Can Tho City - Current status of urban drainage management and flood reduction in Can Tho City - Drainage management includes water quantity (flooded area, flooded time) and flooded water quality in urban residential areas - Urban flooding phenomenon and flood reduction work in Can Tho City - Remaining problems in drainage management and urban flooding reduction in Can Tho City - Impact of uncertain factors on natural conditions and socio-economic development on drainage management and urban flooding reduction in Can Tho City - Applicability of the "Green Infrastructure" solution in drainage management and urban flooding reduction in Can Tho City 2.1.2 Research scope - Spatial scope: the study area of the research is Can Tho city, the geographical location of this city is located in the center of the Mekong Delta region (Can Tho Department of Natural Resources and Environment, 2019): + The north borders Dong Thap province + The northwest borders An Giang province + The east borders Vinh Long province + The south borders Hau Giang province + The southwest borders Kien Giang province The research topic focuses mainly on two urban districts of Can Tho City, including Ninh Kieu District and Cai Rang District In each of the above districts, the author chooses a typical residential area frequently affected by urban flooding to simulate this phenomenon by SWMM drainage model and propose appropriate management solutions The selected areas are Metro Residential Area in Ninh Kieu district and Hung Phu Residential Area in Cai Rang District - Scope of time: the research period is expected to be from 2019 to 2022 - Scope of content: the research content focuses mainly on drainage management and urban flood reduction in the study area 2.2 Research Methods 2.2.1 Content - Synthesizing and screening documents, data, maps, drawings, lectures, textbooks, reports, researches, projects, scientific papers related to drainage management and urban flood reduction in Can Tho City to perform the following three tasks: + Researching theoretical foundations of drainage management and urban flood reduction in Can Tho City + Researching legal bases, legal documents, policies on drainage management and urban flood reduction in Can Tho City + Researching practical basis of drainage management and urban flood reduction in Can Tho City - From the research of the above issues, it will systematize the scientific, legal and practical bases on drainage management and urban flood reduction in the study area This is an important step to orient and define the objectives, contents, scope of research as well as methods and processes to carry out the research - Consulting with supervisors, experts and colleagues to assess whether the research orientation is consistent with the actual requirements at the study area - Conducting field surveys at the study area to update detailed and factual information for the research process: + Collecting data and documents on: (1) natural and socio-economic conditions in the study area, (2) hydro-meteorological characteristics in the study area, (3) the current status of the drainage system, (4) current status of drainage management, (5) urban flooding + Taking pictures and preliminary assessment of the current status of the drainage system by actual observation Surveyed objects include sewer lines, water collection manholes, receiving sources, rivers and canals + Taking photos and preliminary assessment of urban flooding by actual observation Surveyed objects include flooded locations, inundation depth, inundation time, and damage caused by flooding - Collecting digital maps, CAD drawings, satellite images for research including: (1) administrative boundaries, (2) transportation systems, (3) waterways systems, (4) topographical surfaces, (5) land use features, (6) drainage systems, (7) urban flooding, (8) satellite images with different spatial resolutions - Using GIS software to reprocess digital maps, CAD drawings with the same structure, format and coordinate system to be able to overlay and analyze data - Using statistical software to perform descriptive statistics about the parameters of the drainage system and the current flood situation in the study area - Carrying out survey by survey form for households living in two residential areas Metro and Hung Phu The number of subjects to conduct the survey is determined based on Slovin's formula (published in 1960) Slovin's formula looks like this: system Through the interview process, the surveyed subjects also demonstrated their understanding of the layout of drainage system components in these areas Most of the surveyed subjects assessed that the drainage system in two residential areas was operating normally (Metro residential area 91.86%, Hung Phu residential area 93.33%) In addition, there are also a small number of surveyed subjects evaluating that the drainage system in two residential areas is in good working order (Metro residential area 5.81%, Hung Phu residential area 6.67%) Particularly in Metro Residential Area, two surveyed subjects rated the drainage system not working well (2.33% of the survey votes) Residents in Metro Residential Area said that this area operates food services and hotels, so sometimes the smell from the sewers affects their lives and work In addition, people in this area also said that when there is heavy rain, rainwater mixes with sewage and sludge in the sewers to form a black, foul-smelling and viscous mixture of water The characteristics of the drainage system in two residential areas Metro and Hung Phu recorded from the field survey are as follows: - The drainage system is designed according to the common drainage solution for rainwater and domestic wastewater - Mixture of rainwater and wastewater is directed towards natural discharge into rivers and canals - The form of water drainage is to be drained in a closed sewer system, arranged along the sidewalks of public roads - Domestic wastewater and rainwater on the roofs of households are led to the collecting ditch in the technical corridor behind the house, from there leading to the common drainage system - Sanitary wastewater is pre-treated by a septic tank before being discharged into the manifold - The process of wastewater drainage can be deposited at manholes, which can take advantage of tidal water to wash and dissolve wastewater - Rainwater contributes to washing and cleaning the drain - The manifold is built with bricks in the form of an open ditch covered with a reinforced concrete knit cap - The common drainage system uses circular sewer pipes made of centrifugal reinforced concrete The design and material characteristics of the drainage system are one of the main reasons why the sewers are prone to clogging due to 12 garbage and sludge The above problem leads to the sewer system being frequently overloaded and not operating at its full design capacity, thereby causing prolonged and increasingly serious flooding in the study area 3.1.2 Survey results on the current status of drainage management in Metro and Hung Phu Residential Area According to the survey results, the majority of respondents rated the drainage management in the two residential areas at an average level (Metro Residential Area 81.40%, Hung Phu Residential Area 96.67%) In addition, there are also opinions that the drainage management in the two residential areas is not good (Metro Residential Area 13.95%, Hung Phu Residential Area 3.33%) Particularly in Metro Residential Area, surveyed subjects rated the drainage management at a good level (4.65% of the survey votes) The survey results also show that the drainage system in two residential areas is rarely dredged and renovated (Metro Residential Area 77.91%, Hung Phu Residential Area 70.00%) A small number of respondents commented that the drainage system in two residential areas is regularly dredged and renovated (Metro Residential Area 22.09%, Hung Phu Residential Area 30.00%) The surveyed households said that in both residential areas, the drainage system is usually dredged and cleared once a year, before the rainy season to avoid flooding Teams of dredging to clear the drainage system are contracted by Can Tho Water Supply and Sewerage Joint-Stock Company From the survey results and interviews at two residential areas Metro and Hung Phu 1, the process of analyzing stakeholders for the management of drainage and reducing urban flooding at the residential scale was carried out This process helps the author to identify internal and external groups that affect drainage management and reduce urban flooding as follows: - Internal group inside: households, management board of residential areas, residential groups, People's Committees of Hung Loi and Hung Phu wards, Police of Hung Loi and Hung Phu wards - External group: People's Committee of Ninh Kieu and Cai Rang districts, Police of Ninh Kieu and Cai Rang districts, Department of Construction, Department of Agriculture and Rural Development, Department of Natural Resources and Environment, Department of Finance, Department of Planning and Investment, Department of 13 Industry and Trade, Department of Information and Communications, Can Tho Water Supply and Sewerage Joint-Stock Company Among the above related subjects, households, residential groups and people's committees of wards play an important role in the management and planning of water drainage as well as reducing flooding in the locality The survey results also show that due to the drainage system in the research area due to many stakeholders participating in the management and operation process, leading to a poor coordination with each other, causing asynchronous in implementation Many sewers in the study area have been damaged and degraded but have not been repaired in time In addition, there is a phenomenon that some drainage sections are blocked by garbage and sludge that have not been dredged regularly This situation is one of the important causes leading to flooding in the study area 3.1.3 Survey results of urban flooding in Metro and Hung Phu Residential Area Survey results show that both Metro and Hung Phu residential areas frequently flood (Metro Residential Area 100.00%, Hung Phu Residential Area 87.78%) Most of the surveyed subjects assessed that the flooding situation in two residential areas has not been overcome (Metro Residential Area 100.00%, Hung Phu Residential Area 92.22%) Flooding in the two surveyed residential areas has the following main characteristics: - In the Metro Residential Area, the flooding time usually takes place from hour to hours (91.86% of the survey votes), while in the Hung Phu Residential Area, the flooding time usually takes less than hour (70.00% of the survey votes) - In the Metro Residential Area, the flooded area is usually the whole route (90.70% of the survey votes), while in the Hung Phu Residential Area, the flooded area is mainly the area in front of the house (71.11% of the survey votes) - In both residential areas, the flood depth is mainly from 0.2 to 0.3 m (Metro Residential Area 94.19%, Hung Phu Residential Area 63.33%) - The cause of flooding in the two residential areas is mainly due to many factors combined (Metro Residential Area 80.23%, Hung Phu Residential Area 74.44%) 14 The results showed that 100% of surveyed subjects in two residential areas did not receive instructions on flood prevention measures The majority of respondents also commented that people in two residential areas have not had appropriate flood response measures (Metro Residential Area 91.86%, Hung Phu Residential Area 91.11%) The survey results also show that people in two residential areas not have appropriate measures to prevent flooding (Metro Residential Area 73.26%, Hung Phu Residential Area 78.89%) In addition, a small number of surveyed subjects answered that the measure to prevent flooding is to raise the floor of the house (Metro Residential Area 26.74%, Hung Phu Residential Area 21.11%) The survey results showed that 100% of people in two residential areas assessed that flooding affects their family's health Most of the subjects surveyed in the two residential areas assessed that flooding affects people's lives (Metro Residential Area 95.35%, Hung Phu Residential Area 72.22%) In the Metro Residential Area, people said that the flood situation greatly affects their family's business activities and jobs a lot because this area has many hotels, motels, restaurants and coffee shops (97.67% of the survey votes) In the Hung Phu Residential Area, people also said that the flood situation greatly affected their family's business activities and jobs, but with a smaller percentage (84.44% of the survey votes) Most of the surveyed subjects in the two residential areas assessed that the flooding caused only slight damage to their families (Metro Residential Area 75.58%, Hung Phu Residential Area 95.56%) In the Metro Residential Area, there are 21 surveyed subjects who rate the flooding causing heavy damage to their families (24.42% of the survey votes), while in Hung Phu Residential Area is people (4.44% of the survey votes) All 100% of the surveyed subjects in two residential areas Metro and Hung Phu said that the time to restore their family's activities is right after the flood is over 3.1.4 Analysis results of flooded water quality in Metro and Hung Phu Residential Area Within the scope of the research, the author conducted sampling at 11 locations to assess the quality of flooded water, of which Metro Residential Area has six locations and Hung Phu Residential Area has five locations The selected monitoring time is two days of heavy flooding due to heavy rain combined with high tide peaking in the study area: Metro 15 Residential Area on 13/10/2022, Hung Phu Residential Area on 11/10/2022 Table 3.1 and 3.2 describe some key information of sampling locations in the study area Table 3.1 Flooded water sampling locations in Metro Residential Area Table 3.2 Flooded water sampling locations in Hung Phu Residential Area The analysis results of flooded water quality in two residential areas Metro and Hung Phu are shown in Table 3.3 and 3.4 The results of sampling and analysis of water quality at many locations in the study area showed that the main parameters of flooded water did not meet QCVN 08-MT:2015/BTNMT, so flooded water should be collected to the treatment plant and remove pollutants before discharging into natural river and canal systems The research results also show that the drainage management in the study area is not good, the number of times of dredging to collect sediment is still small, so the sewer system cannot operate at its design 16 capacity, thereby leading to flooding when the study area has rain and high tide occurs Table 3.3 Analysis results of flooded water quality in Metro Residential Area Table 3.4 Analysis results of flooded water quality in Hung Phu Residential Area 3.2 Determining the impacts on drainage management in the study area The results of the field survey and the synthesis of documents show that the drainage management and urban flood reduction in the study area are affected by the following factors: - Mechanisms and policies related to drainage managements - Infrastructure of the drainage system - Features of land use management - Hydrometeorological characteristics 17 - Demographic and occupational characteristics - Climate change and sea level rise The identification of natural and socio-economic impacts on drainage management and urban flood reduction will be done through the use of the SWMM model to simulate flooding in the study area for current and future scenarios 3.2.1 Simulation of urban flooding in the study area by SWMM model At Metro Residential Area, simulation results using SWMM model show that 107/111 nodes were flooded due to rain and high tide during the simulation period from 20/10/2021 to 23/10/2021 (Nguyen Thanh Ngan, Nguyen Hieu Trung, 2023) At simulation nodes, flooding time is from 0.01 hours to 0.38 hours, maximum flow is from 191.61 l/s to 23,650.39 l/s, total flood volume is from 1,000 l to 2.925,000 l (Nguyen Thanh Ngan, Nguyen Hieu Trung, 2023) The date with the highest number of flooded nodes during the simulation period is 23/10/2021 (Nguyen Thanh Ngan, Nguyen Hieu Trung, 2023) The results from the SWMM model also show that most of the roads in the Metro Residential Area are flooded during heavy rain and high tide The heavily flooded roads are Ngo Si Lien Street, Street 1, Street 2, and Street At Hung Phu Residential Area, simulation results using SWMM model show that 348/361 nodes were flooded due to rain and high tide during the simulation period from 20/10/2021 to 23/10/2021 The simulation results also show that the maximum discharge varies from 2.37 l/s to 19,022.46 l/s, the total flood volume varies from 1,000 l to 14,230,000 l, the flooding time varies from 0, 01 hours to 2.81 hours The date with the highest number of flooded nodes during the simulation period at KVNC is 22/10/2021 The results from the SWMM model also show that the northern area of Hung Phu Residential Area is flooded during heavy rain and high tide The heavily flooded roads are Ly Thai To Street, Nguyen Ngoc Bich Street, Hoang Van Thai Street, A2 Street, A6 Street, B3 Street, B18 Street, B20 Street and B23 Street 3.2.2 Simulation of future urban flooding scenario in the study area This research simulates the flooding in two residential areas Metro and Hung Phu with a future scenario in 2030 Through field surveys and interviews with managers, the entire area of two residential areas 18