ESTIMATION OF RUNOFF FROM MOUNTAINOUS WATERSHED- A CASE OF THIRUVANNAMALAI, TAMILNADU, INDIAK. Santhanam, Marykutty Abraham and Kishan Singh Rawat
The water requirement is increasing to meet the demand of growing population for domestic, industrial and irrigation demands. Surface water potential of Tamilnadu is almost utilised and hence it is essential to assess the surface water potential for the judicious use of the available water resources. Surface runoff of upper Thurinjalar watershed in Tamilnadu, India was estimated in order to find out the total quantum of utilisable water available from surface water source to support the demands of the watershed community and to convert waste land into productive land. The philosophy behind effective rainwater harvesting is that rainwater should be either drained to surface storages or recharged underground. USDAâNRCS model with daily time step was used to estimate surface water potential for upper Thurinjalar watershed for seventeen years. According to the model average annual surface water availability of Upper Thurinjalar watershed having a total area of 323.41 km2 is estimated as 57.50 MCM which is 18.69% of rainfall for the study period. A simple regression model was developed to compute runoff from rainfall based on water balance computations and statistically verified. The average annual runoff computed for the watershed for the study period using regression model was 58 MCM which is 19.27 percent of annual rainfall. It is clear that there is sufficient water available in the watershed and if effectively harvested and a major portion of the waste land can be converted into productive land. The study also proves that simple regression.
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