2-Mapping of Waterlogged Area by Remote Sensing Techniques.

Abstract

Waterlogging Is becoming a serious problem in irrigated command area of India; the study area is SriRam Sagar command, which is about 120 km north of Hyderabad. An attempt has been made to make an assessment of waterlogged areas during pre & post monsoon period in the SriRam Sagar command using remotely sensed and field data. IRS-1A-LISS-11 digital data (CCT 's) of April 12 and October 6, 1989 were analysed to assess the waterlogged areas in SriRam Sagar command. The validation of the IRS derived waterlogged area was done with the available water table depth data and other field informations. The result obtained from this study indicate that in April and October, 1989, an area of 388 and 540 sq.km was waterlogged. It is suggested that periodic assessment of waterlogging using remotely sensed data should be carried out in the SriRam Sagar command The IRS data have been proved to be very successful for the assessment of waterlogging. Gray level slicing is useful technique to make an assessment of waterlogged areas in irrigated command area.