Impact of Land use Land cover change on Storm Runoff Generation: A case study of suburban catchments of Pune, Maharashtr
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Impact of Land use Land cover change on Storm Runoff Generation: A case study of suburban catchments of Pune, Maharashtra, India Kopal Kumar1 · Anargha Dhorde1 Received: 31 January 2019 / Accepted: 23 May 2020 © Springer Nature B.V. 2020
Abstract Urbanization has evolved as one of the key factors responsible for the environmental health not only for the urban centres, but also for the suburban regions. In the recent years, most of the suburban regions in India are experiencing flash floods during the high intensity low duration rainfall condition. Such situations of flash floods in the urban and suburban areas are referred to as storm runoff. This paper deals with the computation of storm runoff in the suburban catchments of the Pune City. Five catchments, known for flash floods in the recent years, are identified for the present work. Storm runoff estimations in these catchments have been done using LandsatTM data of 1989 and 2011. Population-calibrated impervious surfaces (IS) were extracted for these catchments, and runoff has been calculated using the Soil Conservation Service-Curve Number method. Major changes in the land use land cover pattern in these 22 years have been detected, with a net growth in built-up area of almost 10 times from 1989 to 2011, leading to the increase in IS in the catchment. The impact of increase in built-up area and IS has augmented storm runoff in the catchment. Estimated runoff values increased from 461.8 m3 to 1068.52 m3 (Baner), 2026.4 m3 to 3638.73 m3 (Kharadi), 2947.5 m3 to 4736.46 m3 (Kondhwa Ghorpadi ), 1021.1 m3 to 2039.57 m3 (Wadgaon Sheri) and 1176.89 m3 to 3691.18 m3 (Wadgaon Budruk) from 1989 to 2011. Thus, it is quite evident that the growth in built-up area and impervious surfaces has enhanced the capacity of suburban basins to generate more runoff. Keywords Land use land cover · Suburban catchment · Impervious surface · Storm runoff · SCS-CN method
1 Introduction In recent times, urban flooding has become a major concern with scientists from all over the world, who are working on resolving queries related to climatic change and urban hydrology. It has thus become increasingly important to understand and analyse * Anargha Dhorde [email protected] 1
Department of Geography, Nowrosjee Wadia College (Affiliated to the Savitribai Phule Pune University), Pune, Maharashtra 411001, India
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the underlying realities of urban flooding and to offer remedies to resolve it. The shift of land use from rural agricultural to a built-up landscape has been a result of urbanization, which has led to an increase in the Impervious Surface Area (ISA). ISA includes built-up areas such as roads, buildings, pavements, roof tops, etc., that prohibit percolation of water (Schueler 1994). This water, in turn, translates into an increased surface flow leading to channel erosion and degradation of habitat which has an adverse effect on aquatic life (Bird et al. 2002). This spread of water on the surface is known as surface run
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