Identification of floodwater source areas in Nepal using SCIMAP‐Flood

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 fi...

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Bibliographic Details
Published in:Journal of flood risk management 2022-12, Vol.15 (4), p.n/a
Main Authors: Pearson, C. J., Reaney, S. M., Perks, M. T., Hortobagyi, B., Rosser, N. J., Large, A. R. G.
Format: Article
Language:English
Subjects:
Agriculture
Catchment area
Catchments
catchment‐scale
Civil Engineering
critical source areas
decision support
Deforestation
Engineering Sciences
Environment and Society
Environmental Sciences
Flood control
Flood management
flood mitigation
Flood peak
Flooding
Floods
Floodwater
Geography
Humanities and Social Sciences
Locations (working)
Mitigation
Rainfall
Rainfall simulators
Rainfed farming
Risk management
Risk reduction
Risques
SCIMAP‐Flood
Simulated rainfall
spatial targeting
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Summary: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.
ISSN:1753-318X
1753-318X
DOI:10.1111/jfr3.12840