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Accueil du site → Doctorat → États-Unis → 1980 → RUNOFF PREDICTION AND RAINFALL UTILIZATION IN THE SEMI-ARID TROPICS

Utah State University (1980)

RUNOFF PREDICTION AND RAINFALL UTILIZATION IN THE SEMI-ARID TROPICS

KRISHNA, J. HARI

Titre : RUNOFF PREDICTION AND RAINFALL UTILIZATION IN THE SEMI-ARID TROPICS

Auteur : KRISHNA, J. HARI

Université de soutenance : Utah State University

Grade : Doctor of Philosophy (PhD) 1980

Résumé
A parametric simulation model has been developed to predict storm runoff volumes from small watersheds. It has minimal input data requirements which include daily rainfall amount, storm duration or rainfall intensity, and pan evaporation data. There are only two parameters (related to infiltration) which are determined through an optimization procedure during the calibration process. Hydrologic data was used from three small research watersheds with different land management treatments, located at ICRISAT, Hyderabad, India. A high degree of correlation was obtained between computed and measured runoff volumes in all cases. The model also simulated very well the variation in soil moisture during the test period. It was shown, by using data from another distantly located watershed that the parameter values for the model were transferable. When hydrologic data is not available for calibration purposes, initial estimates of the parameters can be made to provide preliminary runoff estimates even for a new location. Thus the model was shown to be transferable not only to similar sites, but with proper judgment in selecting parameter values, to new locations as well. The water balance computations of the model were used to determine the effective rainfall under traditional and improved methods of land and water management for crop production in India. It was shown that effective rainfall could be increased three-fold by the adoption of improved land and water management technology. Actual yield data was used to show that significantly higher rainfall productivities than those at the present time, can be achieved by applying improved land and water management techniques along with other inputs to form a comprehensive crop production technology for the Semi-Arid Tropics

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