Central Soil and Water Conservation Research and Training Institute, Research Centre, Sellary - 583 104, India
Available data from 32 small watersheds of Tungabadhra river valley project region were subjected to analysis for developing relationships between the intensity of land treatment and runoff/soil loss. The land treatment consisted of contour bunds gully plug and farm ponels in the arable land and nala bunds and gully checks/check clams in the non arable lands. It is evident from the curve fitted with the available data that runoff and soil loss decreases exponentially with increase in intensity of land treatment. The results show that with the increase in land treatment, reduction in runoff was from 28% to 2% of annual rainfall while it was from 5000 to 250 cu.cm/ha/mm of runoff in case of soil loss. The reduction of runoff and soil loss minimised the reduction of gross storage in Tungabhadra Reservoir.
