Volume : 4, Issue : 7, July - 2015

SURFACE WATER QUALITY ASSESSMENT AND MAPPING USING WQI AND GIS- A CASE STUDY FROM HYDERABAD

V. Hema Sailaja, M. Anji Reddy

Abstract :

<p>This paper deals with the decision making tool of complex water quality data, informing managers about the overall water quality status of Hussain sagar lake of Hyderabad District, Telangana, India by providing the spatio- temporal changes. Mapping was done using satellite data &amp; GIS combined with GCP measurement of selected 21 sample points. Water quality data was collected for both pre-monsoon and post-monsoon seasons for two years. The water quality parameters included, Sacchi depth, Chl-a, TSS, pH, BOD, DO, Turbidity, TP, NO3-N, TDS, FC and TH. Using satellite data and in situ measurement data of water quality parameters, correlation were developed through geo-statistical analysis. The Q-Q plots were derived to evaluate sample distribution deviations. With the help of these multiple water quality parameters obtained through laboratory analysis water quality index (WQI) was calculated using NSFWQI and digital cartographic quality maps depicting the water quality over the lake for both the seasons respectively were prepared which revealed the bad quality condition of the lake projecting issues of concern</p>