Sediment Yield and Mean Annual Discharge from Watersheds in the Indian Subcontinent

by Victor J. Galay, Northwest Hydraulic Consultants Ltd., Egypt,
Barry Evans, Northwest Hydraulic Consultants Ltd., Egypt,

Document Type: Proceeding Paper

Part of: Sediment Transport Modeling


Measurements of sediment deposition in reservoirs located in the Indian subcontinent (India, Nepal, Pakistan) indicate that the rate of sedimentation is much higher than predicted during the design stage of various projects. Rates of sedimentation were found to be two to twenty times the predicted rates which were generally based on a relationship of sediment yield to watershed area. Recent studies of watersheds in the Nepal Himalaya indicate that the dominant sources of sediment load are mass wasting (landslides) and debris torrents which suggests that the denudation model is inappropriate for describing the erosion process. However, there is inadequate data to accurately determine the supply of sediments from the mass wasting process. Therefore, a relationship was developed between annual sediment yield and mean annual discharge for various watersheds.

Subject Headings: Sediment | Water discharge | Watersheds | Developing countries | Landslides | Debris | Erosion | Sediment transport | Asia | Himalayas | Nepal | Pakistan | India

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