Assessment of the status of surface waterlogging in Sarda Sahayak Command area of Uttar Pradesh, India using IRS-1A, LISS-1 Data
The area
The Sarda Sahayak command area lies between the Ghaghra and the Ganga rivers extending upto their confluence i.e. between 8000" E & 84075'E longitude and 25019'Nlatitude . The command area covers over 161 development blocks of 14 districts of Uttar Pradesh. Physiographically, the area is almost a flat terrain with occasional undulations. The general slope of the terrain is Northwest to Southeast. Geologically, the area comprises alluvium and forms a part of the Ind-Gangetic alluvial plains. geomorphologically, the area can be divided into the highland comprising older alluvial and lowland marked by marked by younger alluvium: Te Ghaghra, Sarda, Gomti, Sai, Chauka, Reth, Rari, Kalyani, Bethwa, Naiya, Somli, Varuna etc., rivers draining the command area have changed their river course form time to time and left behind old meanders, ox-how lakes, paleochannles, depressions etc., which are periodically inundated causing extensive waterlogging. The soils in the area are derived from the alluvium and are clayey loam to silty clay containing pockets of scandy loams. The soils at many places has become saline which are locally called as 'Usar'. In general, the groundwater
table varies fro0.5m to 2.0m below ground level in the vicinity of canal system.
Data inputs
The black and white aerial photographs on :15,000 scale and Landsat MSS/TM data were visually interpreted prior to the field checking for selecting suitable training sets. The survey of India topographical maps in 1:50,000 scale were utilized for locating training area. IRS-1A, Liss-I satellite scenes (FCC/CCT's of P24-R49, P25-R49, P26-R48) of February 1989 covering the entire part of the command area used for the visual and digital image analysis. Covering the surface waterlogged area adjacent to the feeder channel from head to ch. 104.2 km was also used for change detection study (Report No. RSAC:WD:85"01"1985).
Fig.I Location map of Sarda Command area
Approach and methodology
The methodology adopted for the assessment of surface water logged areas in the command is show in
fig. II. It broadly involves the following five steps :
- Pre-field interpretation of aerial photographs and satellite data & collection of collateral information.
- Near real time ground truth collection & selection of training sets.
- Visual interpretation of IRS-IA, Liss-I data.
- Digital image analysis of IRS-IA, Liss-1 Data
- Evaluation of results and report preparation
Fig.II Methodology for assessment of surface waterlogging
in Sarda Sahayak Command area
