Please use this identifier to cite or link to this item: https://rda.sliit.lk/handle/123456789/873
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dc.contributor.authorRathnayake, U. S-
dc.contributor.authorWeerakoon, S. B-
dc.contributor.authorNandalal, K. D. W-
dc.contributor.authorRathnayake, U-
dc.date.accessioned2022-01-31T08:00:15Z-
dc.date.available2022-01-31T08:00:15Z-
dc.date.issued2007-
dc.identifier.urihttp://localhost:80/handle/123456789/873-
dc.description.abstractThe occurrence of floods and inundation of the low lands adjacent to the Mahaweli River reach from Gampola to Polgolla were very frequent prior to the Kotmale reservoir project in mid 1980s. However, during last two decades with the construction of the Kotmale dam, the regulation of flow by the reservoir has reduced the inundation risk of these lands, which were vulnerable to frequent flooding. As a result, these lands are developed at an increasing rate and more people have started to live in them. This fact gives an alarming signal to the authorities, as the damage that might be caused due to an extreme flood event could be significant. It is therefore of paramount importance that comprehensive flood modeling and inundation analysis of the Mahaweli River reach between Kotmale and Polgolla is carried out. This paper presents the flood modeling and inundation analysis in the Mahaweli river reach from the Kotmale dam to Polgolla barrage using the HECRAS model. The HECRAS model was set up for the river reach using the river cross-sections at 200 m intervals from Kotmale dam to Polgolla barrage. The model was applied to estimate the water stages along the river reach for the floods of different return periods. Though the Kotmale reservoir acts as a flood control reservoir for floods of medium return periods, it becomes ineffective to reduce the flood levels in the downstream flood plains due to floods of high return periods when it has to release high discharge. Inundation areas in the downstream of the dam due to several flood discharges are presented.en_US
dc.language.isoenen_US
dc.publisherUniversity of Peradeniyaen_US
dc.relation.ispartofseriesnternational conference on Mitigation of the risk of natural hazards, Peradeniya, Sri Lanka, March 27–28;Volume 8-
dc.subjectinundationen_US
dc.subjectflooden_US
dc.subjectdischargeen_US
dc.subjectmodelingen_US
dc.subjecttop widthen_US
dc.subjectreservoiren_US
dc.titleFlood modeling in the Mahaweli River reach from Kothmale to Polgollaen_US
dc.typeArticleen_US
Appears in Collections:Research Papers - Department of Civil Engineering
Research Papers - Open Access Research
Research Papers - SLIIT Staff Publications

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