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India has abundant water resources, including rivers and snow-covered mountains in the Himalayas, which can supply the country's water needs. In many areas, however, accessible water supplies are depleting due to fast population growth and the need to fulfill rising demands for irrigation, human and industrial consumption. Physico-chemical and microbiological characteristics were stuided of the Asan river water in Doon valley of Uttarakhand, India, that sampled were collected a fourteen water quality parameters at seven locations from October 2018 to March 2019. The water quality index and water quality maps was prepared in the Arc GIS software 10.7 using Inverse distance weighted (IDW) method. The sampled datasets were used to prepare a spatial water quality index map based on Analytical Hierarchy Process. Based on the results the weightage of the pH was found to the maximum (24%), BOD (17%), DO (13.7%), TDS (11.1%), EC (7.8%), TH (4.8%), CH (4.6%), MH (4.5%), WT (3.4%), AT (2.4%), Na (1.9%), K (1.7%), NO3(1.5%) and PO4 (1.3%). The result demonstrates that the water is heavily polluted towards station three caused due to the extensive anthropogenic activities. Thus, there is a need for combined government and non-government measures to enable the Asan rivers to slow their decline and return to their natural, pollutant-free state, which is crucial for the health of their environment. [ABSTRACT FROM AUTHOR]

The water quality represents the water's physical, chemical and biological properties and depends on the environment, and anthropogenic influences. Recently, river water in Dehradun has subjected to immense pressure due to contamination from indecorous land use and urbanisation. In this study area, water quality assessment is carried out with the help of in situ observations and satellite surface reflectance from October 2018 to March 2019. Physicochemical and microbial qualities, namely, ambient temperature (AT), electrical conductivity (EC), water temperature (WT), potential hydrogen (pH), free carbon di oxide (CO2), biological oxygen demand (BOD), dissolved oxygen (DO), total dissolved solids (TDS), salinity (S), total Hardness (TH), calcium hardness (CH), magnesium hardness (MgH), sodium ion (Na), Potassium ion (K), nitrate (NO2), phosphate (PO4), and coliform concentrations (CC) were evaluated in the laboratory, plotted spatially in GIS environment and validated with the Indian Standards (IS). Furthermore, the Pearson correlation matrix was an established between the mean surface reflectance band values of Landsat-8 in the Google Earth Engine (GEE) and the water quality parameters are collected at each station location. The entire river water has been found an unsuitable for drinking but suitable for irrigation purposes. In future, such studies would be supportive for more effective management strategies to overcome the problems of water pollution. [ABSTRACT FROM AUTHOR]