Current Science

M. S. Rawat ¹, D. P. Uniyal ¹, R. Dobhal ¹, Varun Joshi ², B. S. Rawat ³, Anil Bartwal ⁴, Devendra Singh ⁵, Ashok Aswal ⁵

Affiliations
1 Uttarakhand State Council for Science & Technology, Vigyan Dham Jhara, Dehradun 248 007, IN
2 Guru Govind Singh Indra Prastha University, Sector 16C, Dwaraka, New Delhi 110 078, IN
3 Dayanand Brijendra Swarup (PG) College, Dehradun 248 001, IN
4 Mandakini Hydropower Project, Phata 246 471, IN
5 Uttarakhand Space Application Centre, Vasant Vihar, Phase II, Dehradun 248 006, IN

Abstract

The Mandakini Valley of Rudraprayag district, Uttarakhand witnessed unprecedented damage to life, property, infrastructure and landscape on 16 and 17 June 2013 due to torrential rains. Run-off discharge data indicate that antecedent rainfall exceeded the limit and the overflow of rivers led to landslide in the region and flash floods in the downstream areas. Fragile geology of the area, close to Main Central Thrust (MCT), degradation processes and torrential rains are responsible for triggering landslides and flash floods. A landslide inventory was carried out in the affected areas based on pre- and post-flood high resolution satellite data (LISS-IV and Cartosat-2). A total of 290 landslides were identified from pre-flood satellite LISS IV (2011) imagery and 1665 were identified in post-flood satellite imagery along major rivers. Using remote sensing and geographic information system techniques, thematic layers were generated. Using the weightage rating system, a landslide hazard zonation map of the area was prepared. Each class within a thematic layer was assigned an ordinal rating from 1 to 9. Summation of these attribute values was then multiplied by the corresponding weights to yield different zones of landslide hazard. A landslide hazard zonation map having five different zones ranging from very low hazard zone to very high hazard zone was prepared with the objective to create a reliable database for post-disaster management and for planning developmental activities in the district.

Keywords

Flash Floods, Landslide Hazard Zonation, Satellite Data, Thematic Layers.

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Rajendra Manoj Dobhal ¹, D. P. Uniyal ¹, Manoj Kumar Singh ¹, J. S. Aswal ¹, K. N. Bhardwaj ¹, Neeraj Kumar ²

Affiliations
1 Uttarakhand State Council for Science & Technology, Vigyan Dham, Jhajra, Dehradun 248 007, IN
2 National Academy of Sciences, India, Allahabad 211 002, IN

Abstract

No Abstract.

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Bhavtosh Sharma ¹, D. P. Uniyal ², Rajendra Dobhal ², P. C. Kimothi ³, T. Grischek ⁴

Affiliations
1 Uttarakhand Science Education and Research Centre (USERC), Dehradun, IN
2 Uttarakhand State Council for Science and Technology (UCOST), Dehradun 248 007, IN
3 Uttarakhand Jal Sansthan (UJS), Dehradun, IN
4 University of Applied Sciences, Dresden, DE

Abstract

Bank filtration (BF) has emerged as an economical and sustainable water pre-treatment technology for drinking water supply. In this method, subsurface water of a water body moves into the well by seepage. BF wells adjacent to a river or lake pump the stored groundwater abstracted from the surface through aquifers. Chemical and biological contaminants such as turbidity, microbes, dissolved chemicals and natural organics are removed by the channel of aquifers present in the area. The whole process follows a series of physical, chemical and biological processes with some redox reactions. This study highlights the role of BF method in regulating water quality and quantity improvement. Besides, attempts have been made to discuss the mechanism, significance and the development of BF technology in the hilly state of Uttarakhand. Water quality status of Srinagar and Satpuli river BF sites of Uttarakhand are also described and compared with the Bureau of Indian Standards guidelines.

Keywords

Bank Filtration, Drinking Water, Rural Community, Sustainable Solution, Uttarakhand.

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