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Identification of floodwater source areas in Nepal using SCIMAP-Flood

Lookup NU author(s): Dr Matthew Perks, Dr Borbala Hortobagyi, Professor Andy Large



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


© 2022 The Authors. Journal of Flood Risk Management published by Chartered Institution of Water and Environmental Management and John Wiley & Sons Ltd. Practical approaches for managing flooding from fluvial sources are moving away from mitigation solely at the point of impact and towards integrated catchment management. This considers the source areas, flow pathways of floodwaters and the locations and exposure to the risk of communities. For a field site in southern Nepal, we analyse catchment response to a range of simulated rainfall events, which when evaluated collectively can help guide potential flood management solutions. This is achieved through the adoption of SCIMAP-Flood, a decision support framework that works at the catchment-scale to identify critical source areas for floodwaters. The SCIMAP-Flood Fitted inverse modelling approach has been applied to the East Rapti catchment, Nepal. For multiple flood impact locations throughout the catchment, SCIMAP-Flood effectively identifies locations where flood management measures would have the most positive effects on risk reduction. The results show that the spatial targeting of mitigation measures in areas of irrigated and rainfed agriculture and the prevention of deforestation or removal of shrubland would be the most effective approaches. If these actions were in the upper catchment above Hetauda or upstream of Manahari they would have the most effective reduction in the flood peak.

Publication metadata

Author(s): Pearson CJ, Reaney SM, Perks MT, Hortobagyi B, Rosser NJ, Large ARG

Publication type: Article

Publication status: Published

Journal: Journal of Flood Risk Management

Year: 2022

Pages: Epub ahead of print

Online publication date: 10/08/2022

Acceptance date: 12/07/2022

Date deposited: 02/09/2022

ISSN (electronic): 1753-318X

Publisher: John Wiley & Sons Ltd


DOI: 10.1111/jfr3.12840


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Funder referenceFunder name
Faculty of Humanities and Social Sciences Bid Preparation Fund at University of Newcastle
Institute of Hazard, Risk and Resilience, Durham University