Investigation of Low-flow Phenomenon in Case of Droughts

by Tiao J. Chang, Ohio Univ, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


By the use of streamflow and truncation levels, hydrologic droughts are defined. Flows of different truncation level are obtained from each selected subbasin. Flow ratio is calculated by dividing subbasin flow of a certain truncation level by its corresponding outlet flow. Eighteen streamflow gage stations in the Scioto River Basin, Ohio were used for this investigation. It was found that the flow ratios in the basin decrease significantly with increasing truncation levels and mean-flow ratios are approximately equal to their corresponding area ratios. This implies that the use of drainage area ratio for flow estimation is impractical in case of droughts.

Subject Headings: Droughts | Low flow | Case studies | Rivers and streams | Flow measurement | River flow | Streamflow | Hydrology | Ohio | United States

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