A Watershed is the basin of a tributary. It may or may not have a small stream, but whenever it rains, the water flows through it finally to join Some stream. The watershed is thus a physiographic unit and can be conveniently used for small areas.
A watershed is a holistic approach. It includes programs for soil and moisture conservation, water harvesting, afforestation, horticulture, pasture development, and up-gradation of land resources. These plans look at the local needs of the people. It seeks the participation of the people.