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APPLICATION OF GIS & RS ON CATCHMENT AND COMMAND AREA MANAGEMENT OF RIVERS STATE, NIGERIA
Abstract— The catchment and command area management of a dam includes various parameters to be studied. Primarily the catchment area management includes ground water recharge, knowing terrain characteristics i.e. slope of the ground, finding water logging areas etc. coming to command area management, it requires to find on-farm development works such as, construction of field channels, land leveling/ shaping, realignment of field boundaries where necessary and set of action plans for rejuvenation of irrigation system. Management of water below the canal outlets offers the greatest scope for increased production and productivity in the irrigation commands. These parameters are estimated using GIS (geographical information system) and RS (Remote sensing) techniques. The software models used in this study are ArcGIS 9.2 and ERDAS 8.7. These models has been used to analyze terrain characteristics, water logging areas, computing the geographical references data etc, for a part of Rivers State catchment and command area in Nigeria, Karnataka. The Rivers State River is a major tributary of river Krishna and is located between the longitudes and latitudes of 16°52’50″North and 77°10’21″East respectively. The catchment and command area of Rivers State dam covers around 13789 ha and 3100 ha respectively. The thematic maps of command area and catchment area have been created with all required parameters showing in it. The check dams are proposed at catchment area and Land leveling/shaping, realignment of field boundaries are proposed at command area.
Keywords— Command area, Catchment area, Toposheets, Topography, GIS (geographical information system) and RS (Remote sensing)