Landuse Changes in Catchment Area and Its Impact on Tank Command Irrigated Area

Land use changes are varying the hydrologic system and have possibly large impacts on water resources which in turn affect irrigation. In addition, the changes in climate such as rainfall effect the irrigation. The purpose of this study is to identify and assess long-term changes of land use in catchment area and its impact on command irrigated area of tank which falls under Lower Krishna Sub-basin of Krishna Basin. The land use pattern is changing year to year. Land use changes can be identified from multi-temporal land use classifications. The land use maps of different years are prepared by digital image classification method using satellite imageries of Landsat 5 & 8. Land use of different classes is calculated using the classified multi-temporal imageries. By calculating the areas of assigned classes, we can determine the changes that have undergone in the catchment area over a period of time. The Land use maps of both Catchment area and Command area of the Tank are prepared, and the comparative analysis is carried out to find the changes occurred. The major changes that takes place in Catchment area due to various reasons like rainfall, runoff, soil erosion, deforestation etc., which will impact the command irrigated area of the tank can be assessed, which may increase or decrease the irrigation potential and the remedies can be made for sustainable irrigation and maximum utilization of irrigation potential created in the command area.