Identification and delineation of threshold lower Yamuna River basin in Uttar Pradesh

India is world's seventh largest country considering its area and it has abundant water bodies/resources running from north to south and east to west. India's rivers are mainly divided as Himalayan, peninsular, coastal, and inland-drainage basin rivers. Himalayan rivers are snow fed and maintain a high to medium rate of flow throughout the year. The massive annual mean rainfall amounts in the Himalayan catchments further add to their flow. During the monsoon months of June to September, the catchments are prone to flooding. The principal Himalayan Rivers are the Indus, the legendary Ganges and the Brahmaputra. Yamuna River is the principal tributary of the river Ganges which is divided into three sub basins namely Upper, Middle and Lower by the Central Water Commission of India. The Lower Yamuna river basin which majorly includes Chambal, Sind, Betwa, Ken and Tons rivers is the largest among them expanding in three states Rajasthan, Madhya Pradesh and Uttar Pradesh. River Yamuna majorly drains through Uttar Pradesh. According to Central Water Commission the area of entire Yamuna River basin is more than three lakh fifty thousand square kilometers and the Lower Yamuna River basin which is expanded over three states Rajasthan, Madhya Pradesh and Uttar Pradesh, accounts nearly 70% of the total Yamuna River basin. Clearly the area of Lower Yamuna basin is too large and the area coming discretely under the boundary of Uttar Pradesh has neither been delineated separately nor identified individually. With the help of Remote sensing and GIS technique the present study tries to identify and delineate the threshold of Lower Yamuna river basin's extent in Uttar Pradesh.