Urban Flood Simulation in Erbil City by Using Storm Water Management Model (SWMM) (original) (raw)
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Utilization of Storm Water Management Model for Urban Flood Scenario
Blue Eyes Intelligence Engineering and Sciences Publication, 2020
Majors cities in India have witnessed huge floods from past few decades. Due to rapid population growth and improper urban planning the chances of creek, localised or flash urban floods have drastically increased. Climatic changes are also a key reason for heavy rainfall that increases the flood volume and depth in a catchment. Modelling of Storm water plays a key role in estimating flood runoff quantity and quality. To check these issues SWMM is used to simulate floods scenario in Urban areas. This hydrological study is carried out to simulate and understand the rainfall runoff characteristics of the study area by using SWMM. It is an effective tool used for simulating flash floods and runoff in urban areas. In this study catchments have been subdivided into 14 parts and modelled for year 2017 rainfall events of 1-hr interval. The present study area is evaluated by importing AutoCAD map of the area in SWMM. Further Rainfall Data is imported as time series in the model. The results depict that the Runoff for the Sub catchments of S1, S2, S3, S9, S13 blocks are maximum. The study states that no nodes are flooded and also no overflow sections. Thus, the selected study area storm network system has been well planned and has enough carrying capacity to carry the simulated rainfall for a prolonged duration.
Simulation of Urban Drainage System Using a Storm Water Management Model (SWMM)
Asian Journal of Engineering and Applied Technology
Urban floods are caused due to increase in population density, development of urban infrastructure without paying due consideration to drainage aspects and increase in paved surfaces. Storm water modelling plays an important role in checking issues such as flash floods and urban water-quality problems. The SWMM (Storm Water Management Model) has been an effective tool for simulating floods in urban areas. In this study a SWMM model is developed to analyze drainage network for the campus of National Institute of Technology, Warangal in the city of Warangal, Telangana, India. The model is simulated for one real storm event and 2-year return period of interval 1-hour design storm intensity. Frequency analysis is performed using best fitted distribution i.e., Gumbel’s distribution for different return periods and the frequency values are used for development of IDF (intensity-duration-frequency) curves. Design storm intensity derived from IDF curves for different return periods is used ...
STORM WATER FLOOD MODELING IN URBAN AREAS
Storm water flood simulations were attempted through the existing drainage networks of Patna and Chennai urban areas using Storm Water Management Model (SWMM). The input for the model was extracted from different sources and maps in GIS environment. The existing drainage networks catchments were delineated using the Digital Elevation Model (DEM) and flow direction in drainage network. The simulation results are calibrated with observed hydrograph peaks and shape of the hydrographs. The model was run considering the original designed dimensions of the drainage network without any blockage still it is not adequate to dispose of the runoff for two years return period rainfall in both urban areas.
Urban Flood Modelling and Management using Storm Water Management Model
Mattingley Publishing Co., Inc., 2020
Urban areas are the major hotspots for the origination of floods. Occupying the surfaces with various impervious surface features there is an opportunity of changeover of rainfall to runoff which results in flooding. Variations of atmospheric changes is also a crucial factor for precipitation events in unusual times that outcomes in rising flood peaks. Volume of runoff from the investigation area is assessed by adopting Storm Water Management Model (SWMM). The major purpose of utilizing SWMM is to monitor the quality along with quantity of overflow originating from the sub catchments. This study is to illustrate the flooding situations for the urban area for historical utmost intense precipitation event as well as future intense rainfall situations. Flooding conditions of future is assessed by using RCP 4.5 NOAA-GFDL-ESM2M climate model downscaled data. Infiltration and Flow routing are the two essential aspects of SWMM. Modified Green-Ampt method is used for the infiltration while Dynamic Wave method is chosen for Flow Routing. SWMM outcomes are demonstrated in the form of graphs, tables which helps in understanding the overflow section and nodes.
Modelling the impact of design rainfall on the urban drainage system by Storm Water Management Model
Journal of Water and Land Development
Flood modelling is an effective way to manage the stormwater network in cities. It aims to understand and predict the behaviour of stormwater network so that it can test and evaluate effective solutions to structural and operational problems. So simulation modelling stays a preoccupation for building a successful hydraulic modelling in urban areas. This study investigates the impact of the design rainfall on the hydraulic modelling results for the Azzaba stormwater network located in the North-East of Algeria by using the Storm Water Management Model (SWMM). Four scenarios of design rainfall events were compared for 10, 25 and 50-year return periods, where we used double triangle and composite curves for the design rainfall event definition. The results show the impact of the choice of design rainfall on the behaviour of the stormwater network, from which the results of simulation by the double triangle method for the short durations represents a great risk on the probability that t...
Flood Management and Estimation for Urban Area using Storm Water Management Model
National Conference on Emerging Trends in Civil Engineering, 2020
Enlarging populace and movement of individuals to urban communities around the world causes inappropriate urbanization issues, due to this urban foundation is thickly distracted. Simultaneously, anthropogenic movement of human in urban areas upsets the water cycle, appearing about urban warmth island impact. Every one of these prompts the initiation of urban flooding circumstances in a regional zone. Urban territories are the significant hot spots for the commencement of floods. Occupying the surfaces with various impervious surface features there is an opportunity of changeover of rainfall to runoff which results in flooding. Volume of overflow from the examination territory is evaluated by the support of Storm Water Management Model (SWMM). This investigation is to represent the flooding circumstances for the urban territory for authentic most extreme exceptional precipitation occasion just as future extraordinary precipitation circumstances. Flooding circumstances of future is computed by using RCP 4.5 NOAA- GFDLESM2M climate model downscaled data. Infiltration and Flow routing are the two essential aspects of SWMM. Modified Green-Ampt strategy is utilized for the penetration while Dynamic Wave technique is picked for Flow Routing. SWMM results are exhibited as diagrams, tables which helps in understanding the flood area and hubs.
Aswan University Journal of Environmental Studies, 2021
Flash flood is one of the most important natural hazards all over the world. It is very dangerous because of its effect on people's lives and can lead to death. So we must be aware of the flash flood by studying the factors that affect it and predict it. In this paper, hydrological parameters that affect flash floods in arid or semi-arid areas are studied. The study area is Wadi Al-Baroud El-Abiad which is located to the northwest of Safaga city on the red sea coast that is frequently subjected to a severe flash flood. Parameters affecting floods are considered i.e. meteorological (climatic), morphological, and geological factors. Climatic data are analyzed to reach the design storm values for different return periods by knowing the annual rainfall values of the study area by using rainfall data from a rain gauge station near the area. In this research, the mean monthly rainfall values of Safaga meteorological station from 1994 to 2018 are used and the annual maximum values of rainfall rates are extracted from it. Digital elevation model (DEM) and digital terrain data of the catchment are obtained from the USGS EathExplorer website and inserted into WMS and ArcGIS software. To obtain the hydrological characteristics such as unit hydrograph, concentration-time, delay time, and storage coefficient, the land use and soil type in the study area must first be determined by the geomorphological and geological study. SCS and curve number methods are used in estimating the soil type and land use of the basin. Many software and tools are used in data analysis and watershed delineation among them, GIS, WMS, SURFER, HYFRAN, GOOGLE EARTH. From this study, watershed morphological characteristics, flood quantity, and flow hydrograph at Wadi Al-Baroud El-Abiad dam are estimated for different rainfall intensity, duration, and return periods. Moreover, the storage capacity of the dam reservoir at different rainfall intensity, duration and return periods is estimated and the time required for storage water to evaporate and infiltrate into the subsurface soil is identified. The results of this research can help the developer, planners, and decisionmakers for flood management in arid areas.
Simulation of Drainage System Using Storm Water Management Model (SWMM 5.1
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2022
Urban flood is one of the major problems in Guwahati city at present. The topography of the city is such that rainwater cannot drain out easily from the city. With rapid growth of the city, along with people cutting and constructing houses in the surrounding hills, result in high sediment yield from the immediate upper catchment, adding another dimension to this problem. The need for a proper storm water disposal drainage system is at prime in Guwahati. Therefore innovative planning and efficient design of the drainage network is necessary. An effort has been made to study finer details of the area by investigating drainage systems of various parts of the city. The existing drainage channel is studied and simulated using SWMM 5.1 modeling software. The model is simulated for rainfall of two-year return period of interval one-hour design storm intensity. Frequency analysis is performed using best fitted distribution i.e., Gumbel's distribution for different return periods and the frequency values are used for development of IDF (intensity-duration-frequency) curves. The city is divided into major flood prone areas according to ASDMA and then modeling is done with respect to different return period of rainfall. From simulation it is found that the existing drainage of the city is not efficient to drain out the storm-water completely, the primary cause of urban flood in Guwahati city.
Acta Scientiarum Polonorum Formatio Circumiectus
Aim of the study The current paper aims to give a detailed evaluation and analysis of some extreme rainfall events that happened in the last decade in terms of spatial and temporal rainfall distribution, intensity rate, and exceedance probability. Moreover, it examines the effects of each analysed aspect on the resulting flash floods in the studied area. Material and methods In their glossary of meteorology, American Meteorology Society (AMS) subdivided rainfall intensity types into four groups (light, moderate, heavy, and violent). Also, for estimating the exceedance probability, lognormal distribution was applied as a statistical model of the precipitation probability distribution function. Results and conclusions Out of six episodes, five of the analysed events were classified as heavy rainfall. However, the duration of those heavy rainfall events was not more than two hours. Four events of maximum daily rainfall (for a 39-year dataset) were rated at 1-10% of exceedance probability. To conclude, the current study can be an initial step in modelling hydrological events in the studied area, and in the process of transforming precipitation into the outflows of urban basins in the future.
Assessing Flood Occurrence and Modeling Impact of Urban Drainage Structure
2020
This study evaluated the catchment and flood prone area by applying physical and numerical modeling. This described rainfall data and presented evidences of flooding based from extreme precipitation events. Mathematical models were derived using the definition of discharge and Manning’s formula which finally were used to estimate the sufficiency of the river canal cross sectional area to transport great amount of water flow. Mt. Isarog, mountain ranges of Lagonoy and the low land area are the sources of flood water in Lagonoy River. The amount of daily precipitation is always insufficient to induce flooding except for a terrifying event that the area was heavily affected. The river canal cross sectional area is sufficient to accommodate flood water flow but the position of the moon which is indicating differences on river depth during full/new moon and first/third quartermoon, high tide and low tide, and with heavy and non-heavy rainfall.causes the flood while others are due to rive...