Integrated Hydrological-Hydraulic Model for Flood Simulation in Tropical Urban Catchment (original) (raw)
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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.
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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.
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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 ...
To avoid the nuisance of frequent flooding during rainy season, designing an efficient stormwater drainage system has become the need of the hour for present world engineers and urban planners. The present case study deals with providing a solution to stormwater management problem in an urbanized area. Mann-Kendall and Sen's slope tests are used to perform the trend analysis of rainfall events using daily rainfall data , while the L-moments-based frequency analysis method is employed to estimate the design storm for a small urbanized area in West Bengal, India, using daily annual maximum rainfall . SWMM (Storm Water Management Model) and MIKE URBAN models are used to design an efficient drainage system for the study area. Two-dimensional (2D) MIKE URBAN model is primarily used to overcome the limitation of one-dimensional (1D) SWMM in simulating flood extent and flood inundation. Model simulation results from MIKE URBAN are shown for an extreme rainfall event of July 29, 2013. A multi-purpose detention pond is also designed for groundwater recharge and attenuating the peak of outflow hydrograph at the downstream end during high-intensity rainfall. This study provides an insight into the importance of 2D model to deal with location-specific flooding problems.
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