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Predicting flood events in Kathmandu Metropolitan City under climate change and urbanisation by Saurav KC; Sangam Shrestha; Sarawut Ninsawat; Somchai Chonwattana is a Environmental Science article available to read on EtoBox.

What is Predicting flood events in Kathmandu Metropolitan City under climate change and urbanisation about?

Urbanisation and climate change collectively impose the threat of urban flood. The impervious transformation and changes in local climatic conditions increase the risk of frequent pluvial flooding in Kathmandu. Therefore, this study aims to assess the integrated impact of urbanisation and climate change on pluvial flooding in Kathmandu Metropolitan City, using the Personal Computer Storm Water Management Model. The future daily rainfall from three Regional Climate Models under two Representative Concentration Pathways (RCPs) and the observed daily data has been disaggregated to hourly series using temporal rainfall disaggregation. The result shows that the combined impact on pluvial flood is likely to intensify with relatively more contribution from climate change. The CNRM-CM5-CSIRO-CCAM under the RCP 4.5 scenario projects the maximum increase (60-90%) in flood volume for current (75%) and extreme (90%) imperviousness, under a 2-year and 20-year return period (RP) with the extent of the flood area increasing more than the depth. For a 2-year RP, areas with a depth of 0.10-0.25 m are likely to expand while those from 0.25 to 0.40 m in depth are projected to have more velocity, and

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Author

Saurav KC; Sangam Shrestha; Sarawut Ninsawat; Somchai Chonwattana

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Environmental Science (Physical Sciences)