Envelope curves for the specific discharge of extreme floods in Malaysia

• Published in: Journal of Hydro-Environment Research
• Main Author: Abdullah J.; Muhammad N.S.; Muhammad S.A.; Julien P.Y.
• Format: Article
• Language: English
• Published: Elsevier B.V. 2019
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85066320626&doi=10.1016%2fj.jher.2019.05.002&partnerID=40&md5=ce422e24771b4a93301e4c802c8de855

The relationship between peak specific discharge and watershed area is examined for large, rare and extreme floods in Malaysia using a distributed hydrological model. Envelope curves for specific discharge for these events and the uncertainty is quantified. The relationships between rainfall duration and intensity as a function of watershed size were also examined. As a result, three main regions were defined to estimate the peak discharge as a function of watershed size for large, extreme and rare floods. The average magnitudes for the PMP and the world's extreme rainfall events were 5 and 12 times larger than the 100-year event, respectively. The envelope curves may assist engineers and other interested parties to estimate the peak discharge for watershed up to 100,000 km2, especially for ungauged watersheds. © 2019