Abstract
Abstract Dense urbanization leading to uncontrolled transformations within settlements result in flash flooding with overflowing drains leading to a greater inconvenience for the public and damage to private properties. Hence mapping of flash floods would be useful in identifying the high-risk flood zones for disaster response and urban services, during emergencies with rainfall events of high intensity. This article aims to prepare a flood hazard map of Warangal Municipal Corporation (WMC) in Telangana State, India. WMC is chronically affected due to a rise in water levels resulting in flash floods, with an increase in encroachments. The factors considered in this study are rainfall (curve number), surface slope and surface roughness, type of soil, and distance to main channel, drainage density, and land use cover. To decide the relative weight of the impact of each flood causative factors an Analytical Hierarchical Process (AHP) was used. Accordingly, a composite Flood Hazard Index (FHI) has been derived by using the multiple-criteria decision-making tools by integrating these into a Geographical Information System (GIS). The Soil and Water Assessment Tool (SWAT) in Quantum GIS (QGIS), which is a hydrological model, was used to evaluate the projection of streamflow over the water basin and model parameters were optimized using water balance equations during calibration and validation periods.
Highlights
In the most recent years, a flood was forecasted by applying hydrologic and hydraulic models, The quick beginning of a flood with a brief span which needed large-scale data that are not accessible. and a moderately high peak discharge is largely The utilization of Geographical Information System (GIS)-based MCDA about flood characterized as a flash flood
The raster gives the course in which inlet water will flow out of a cell with regards to its surrounding cells, showing the steepest heading from a cell to the surrounding cells
Flow direction is given as an input raster to basin function, to derive all the connected cells that come from the same drainage basin (ELKHRACHY, 2015)
Summary
In the most recent years, a flood was forecasted by applying hydrologic and hydraulic models, The quick beginning of a flood with a brief span which needed large-scale data that are not accessible. and a moderately high peak discharge is largely The utilization of GIS-based MCDA about flood characterized as a flash flood. A moderately high peak discharge is largely The utilization of GIS-based MCDA about flood characterized as a flash flood. It happens quickly hazard evaluation was uncommon before 2000. An outline of changes was presented by BLACK & BURNS (2002) in the estimation of flood hazard on Scottish waterways with a time line by re-examining the history of flood occurrence. Surface runoff happens as a flash flood are multidimensional phenomena with a spatial (ELKHRACHY, 2015). Increase in urbanization has dimension, which makes GIS very applicative for such been accounted to aggravate flooding by making ground surfaces impermeable, which decreases infiltration. Making settlements the obvious victims of natural hazards like flash floods, which could attack a city without pre-warning
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