Earth System Science Data
Earth System Science Data
Earth System Science Data
Articles | Volume 18, issue 11
Articles | Volume 18, issue 11
https://doi.org/10.5194/essd-18-7915-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-18-7915-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 18, issue 11
Data description article
 | 
02 Nov 2026
Data description article |  | 02 Nov 2026

Network-based subbasin-scale mapping of streamflow alteration in Ontario, Canada

Hongren Shen, Bryan A. Tolson, James R. Craig, Robert A. Metcalfe, Jonathan Romero-Cuellar, and James J. Luce

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Short summary
Dams and other water-control structures can influence rivers far downstream. We calculated the Streamflow Alteration Index for 245 576 subbasins across Ontario, Canada, averaging 4.3 square kilometres. By linking structure locations with connected lake and river networks, we mapped potential downstream influence, including places without flow measurements. This province-wide dataset supports river modelling, water management, ecological studies and targeted local assessments.
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