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Supplementary resources for Summer Institute report 2026 - Slippery slope

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Created:	Jul 17, 2026 at 10:45 p.m. (UTC)
Last updated:	Jul 17, 2026 at 10:59 p.m. (UTC)
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Abstract

This resource has the supplementary material for our analysis of how sensitive HAND flood inundation predictions are to river slope choice. Across six case studies and four slope products (IRIS-SWORD, three SWOT variants, and gauge-based S(Q) where available), we found that even order-of-magnitude slope differences only shifted stage by a few metres and barely changed flood-extent skill, likely due to the square-root slope-discharge relationship and channel/floodplain geometry. On our two paired-gauge reaches, the slope-discharge relationship looked kinematic on the Illinois River but backwater-controlled on the Ohio, suggesting this could help screen reaches for hydraulic behavior type.

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Credits

Funding Agencies

This resource was created using funding from the following sources:

Agency Name	Award Title	Award Number
CIROH	NOAA Cooperative Institute Program	NA22NWS4320003

How to Cite

Wagle, P., Marshall, S., Jamshidi, R., Chen, Z., Cohen, S., Baruah, A. (2026). Supplementary resources for Summer Institute report 2026 - Slippery slope, HydroShare, http://www.hydroshare.org/resource/4b85cbe0a15a480fa13e4e7e61106fd7

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/

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