Juniper Publishers- Journal of Civil Engineering Abbreviations Abbreviations: (CES): Conveyance Estimation System; (DCM): Divided Channel Method; (HEC-RAS): Hydrological Engineering Centre River Analysis System; (SCM): Single Channel Method Introduction River flooding is one of the greatest natural threats to mankind, causing human fatalities, displacement of people and economic losses. In addition to economic and social damage, floods may have severe environmental consequences. In 2007, Britain faced a summer of devastated storms, with thousands of homes and businesses under water, and thirteen fatalities. Although the UK Government has hugely invested in outstanding research and defenses to overcome this problem, the 2015 winter floods on Cumbria seemed to indicate that nothing has changed. Some of the reasons for increasing flood scenarios are out of the Civil Engineers' scope. Climate change as well as in appropriat