AISLUS

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The AISLUS organization of the departments of agriculture and co-operation has been engaged in conducting rapid reconnaissance surveys for prioritization of smaller Hydrologic units within catchment areas of river valley projects and flood prone rivers.it has developed a system for delineating and codifying the catchment areas into smaller Hydrologic units i.e. sub watersheds following the 4 stage delineation. through the methodology developed has been serving the requirement of prioritization , a need for national level framework of watersheds, was always felt by the user agencies. the present bulletin on watershed atlas of india is an endeavor in that direction wherein the entire country has been divided into:

-6 Major Water Resources Region,
-35 River Basin,
-112 Catchments,
-500 Sub-catchments,
-3237 Watersheds following a 5 stage delineation approach.