Hydrologic Performance of Drainage Network under Different Climatic and Land-Use Conditions, A Case Study of Chattogram (original) (raw)

Urbanisation Effect on Hydrological Response: A Case Study of Asan River Watershed, India

Journal of Environment …, 2012

Human being keeps on modifying the environment especially land use/land cover (LULC), in pursuance of excel, comfort and development. The subsequent impact of urbanization to the environment, especially land cover change, now occurs on scales that significantly affect hydrologic variations. The altering environment makes it necessary to understand and quantify various hydrological components for efficient water resource management. Therefore, in the present study, an attempt was made to study the impact of LULC change on runoff generation potential. Asan River watershed, which lies in Dehradun, capital of newly created Uttarakhand State, India, is selected as study region. A huge industrialization is been taken place within this watershed immediately after declaration of state in year 2000. Initially, LULC change detection analysis was carried out by simple LULC class area difference between two years under consideration i.e. 2000 and 2010. The hydrological simulation using variable infiltration capacity macro-scale hydrological model depicted increase in runoff after urbanization took place.

A Review Article on Impact of Urbanization on Hydrological Parameters

2018

As long as human being continues to exists, urbanization continues. Urbanization has a direct effect on environment which in turn effects the variations in hydrology. It may results from changes in the land use pattern to built-up areas resulting in runoff which ultimately leads to flood. Most of the studies revealed that land use pattern has drastically changed in which the built up area increases year after year. The land use land cover changes can be identified using GIS. Many researchers have found that urbanization has an impact on hydrological parameters such as runoff volume, discharge in drains, infiltration, interception, evapotranspiration etc. An attempt has been made to consolidate the review of literature related to impact of urbanization on hydrological parameters.

Urban sprawl and water stress with respect to changing landscape: Study from Lucknow, India

Lucknow is the capital city of India's most populous state Uttar Pradesh. Urban growth currently is largely on par with other cities of similar size, and is anticipated to be slightly faster in the immediate future. The better economic prospect has lead to an increase in the urban population of the city during last few years. It has lead to large-scale urban sprawl and the inherent distinctiveness of hydrological environment is being neglected in urban planning. With the expansion of the urban sprawl and the increasing population, there has been a surmounting pressure on a) natural and built drainage systems b) surface/subsurface hydrological storage units, of Lucknow. The anthropogenic factors have also contributed to the presence of heavy metals in the hydrological units of the city. Upto now the regeneration of water by nature kept the surface and subsurface water ecosystem pure, satisfying the urban and peri-urban requirements. But during last few years, increasing demands from new urban extensions as well as intense agriculture and irrigation practices in surrounding rural areas have stressed the hydrological cycle considerably, raising questions over the sustainability of the water resources in the city. This paper attempts to highlight some important environmental criteria and propose methodology to achieve it, during the design of master plan with a focus on surface and subsurface water integrity of Lucknow building upon city's natural and built environments. Changes in land use and land cover are estimated with respect to urban sprawl from year 1973 and 2005 based upon Survey of India toposheets and satellite data of IRS -1D LISS III PAN Sharpened. Drainage network map is overlaid with land use patterns drawing implications on water environment.

Behavioral study of urban watersheds in Bhopal-city of lakes

International Journal of Hydrology, 2020

Urbanization have crossed the limits of natural carrying capacity challenging mankind and its development in terms of progress. The most notable changes in the natural system observed are related to the urban and hydrological system where built up areas in urban region have increased from 100,000km2 in 1994 to 5,000,000km2 in 2005. It is assumed that almost 0.5% of the world surface is occupied by urban areas The aim of the study is to study the behavioural changes in Urban watersheds for recharge and runoff along with increasing Built up areas contributing impervious surfaces over natural ones. Objective is to develop a better understanding of the interactions between surface water flows and water replenishment with changes in land cover characteristics resulting from urbanization at the local, neighbourhood and regional scales. Another objective is to find out relationship between built up and water (surface and sub surface) with empirical, observational and simulation processes f...

Assessing the Performance of Urban Drainage Networks in Settlements as an Impact of Urbanization

Technium: Romanian Journal of Applied Sciences and Technology

The increase in the number of residents in the city area due to urbanization and the rapid growth of the city's population itself causes many environmental problems, one of which is flooding. The drainage network becomes a vital infrastructure in the development of the city to be free from flood problems, especially in dense areas such as settlements or housing, which are increasingly densely populated every year. The purpose of this study is to examine whether the drainage network in the Berlian Simpati Blorep housing estate in the middle of Merauke City is able to accommodate flood discharge for the next few years. The methods used in this study are quantitative and qualitative, based on the results of the analysis. The results showed that with an existing channel capacity (Qs) of 0.097 m3/sec < the planned flood calculation discharge (Qr) of 13.657 m3/sec, the existing channel capacity was not able to function effectively with a 5-year recurrence period.

Hydrogeological Studies of Urban–Rural Interface in the Northwest Part of Pune Metropolis, India

The Urban Book Series, 2021

Rapid and haphazard urbanization is posing a threat to geo-environment in general and water resources in particular along the fringe areas of metropolitan cities in the world. This problem has reached an alarming stage in developing countries like India. Keeping this fact in view, thematic layers of contours, drainage network, geology and Land use/Land cover were prepared in the GIS environment for two sub-watersheds of River Mula in the NW part of Pune, namely Ramnadi and Pirangut. The superimposed picture of these thematic layers was obtained and interpreted. The overlay of contour- and Land use/Land cover layers in the Ramnadi watershed revealed that 44%, 10% and 2% area occurring, respectively, below 660 m altitude, between 660 and 720 m altitude and above 720 m has been urbanized and thus, is responsible for flash floods, reduction in groundwater recharge vis-a-vis minimizing the groundwater storage capacity. In comparison with this, the Pirangut watershed depicts less impact o...

Hydrological Analysis on Semi-Urban and Urban Areas in Kajang

— Flooding is a natural phenomenon occurred mainly due to heavy rain and improper water resources planning. It is one of the serious natural hazards that may cause damage to human lives, agriculture, environment and structures. This study focuses on the establishment of the latest trending on intensity duration frequency (IDF) curves and determination of various hydrological parameters such as curve number (CN), hydrograph peak time (t p), time of concentration (t c) and manning's roughness coefficient (n) for urban and semi-urban areas in Kajang, Selangor, Malaysia. 25 years of rainfall data from 1990 to 2014, obtained from the Department of Irrigation and Drainage (DID), Malaysia were used in this study. Moreover, the temporal pattern in this study is built of 15 minutes, 30 minutes, 60 minutes, 120 minutes, 180 minutes, 360 minutes, 720 minutes and 1440 minutes. Results from this study exhibited the new established IDF curves developed for Kajang at both semi-urban and urban areas for Sg. Jelok sub-catchment. Based on the calculations conducted, it is found that although the urban areas has a larger value of time of concentration, t c at 12.98 hour and highest value of hydrograph peak time, t p at 0.87 hour, various flooding events are still occurring in several places in the urban areas. These flooding are probably still occurring due to the current active residential constructions and ongoing constructions of elevated inner city train (LRT) in addition to the old drainage system still used in the urban areas of Kajang that hinder the flow of surface runoff.