HEC RAS 2D MANUAL FULL

Arab J Geosci 11:216ДЇederal Flood Commission. Nat Hazards 55(2):181вЂ“209ДЇarooq M, Shafique M, Khattak MS (2018) Flood frequency analysis of river swat using Log Pearson type 3, Generalized Extreme Value, Normal, and Gumbel Max distribution methods. Nat Hazards 85(1):87вЂ“109Д®rnst J, Dewals BJ, Detrembleur S, Archambeau P, Erpicum S, Pirotton M (2010) Micro-scale flood risk analysis based on detailed 2D hydraulic modeling and high resolution geographic data. Nat Hazards 52(1):143вЂ“166Д®lfeki A, Masoud M, Niyazi B (2016) Integrated rainfallвЂ“runoff and flood inundation modeling for flash flood risk assessment under data scarcity in arid regions: wadi Fatimah basin case study, Saudi Arabia. Дe Kok J-L, Grossmann M (2009) Large-scale assessment of flood risk and the effects of mitigation measures along the Elbe River. Blackburn Press, CaldwellД¬oninx I, Bachus K (2007) Integrating social vulnerability to floods in a climate change context. Nat Hazards 65(1):241вЂ“254Д¬allow J, Van Niel K, Boggs G (2007) How does modifying a DEM to reflect known hydrology affect subsequent terrain analysis? J Hydrol 332(1вЂ“2):30вЂ“39Д¬hen H, Ito Y, Sawamukai M, Tokunaga T (2015) Flood hazard assessment in the Kujukuri Plain of Chiba Prefecture, Japan, based on GIS and multicriteria decision analysis.

Accessed Д«utt MJ, Umar M, Qamar R (2012) Landslide dam and subsequent dam-break flood estimation using HEC-RAS model in Northern Pakistan. Journal of Himalayan Earth Sciences 48(2):129вЂ“138Д«runner GW (2016) Combined 1D and 2D modeling with HEC-RAS available from Hydrologic Engineering Center (HEC). The developed flood hazard maps will enable the policy makers to mainstream flood hazard assessment in the planning and development process for mitigating flood hazard in Swat Valley.Д«ahadar I, Shafique M, Khan T, Tabassum I, Ali MZ (2015) Flood hazard assessment using hydro-dynamic model and GIS/RS tools: a case study of Babuzai-Kabal Tehsil Swat Basin. Landcover exposure to the designed flood events shows that agriculture including orchards is the major potential affected class with affected areas up to 55 Km 2. Simulated extents based on the 12-m WorldDEM were used for the preparation of flood hazard maps.

HEC RAS 2D MANUAL FULL

Finally, the model was simulated for 2, 5, 10, 25, 50, and 100-year return periods with full momentum equation as the calculation method. Designed hydrographs were prepared for 2, 5, 10, 25, 50, and 100-year return periods based on the Flood2010-observed hydrograph. In addition, flood model sensitivity to the DEM was carried out and simulated maximum depth was 12, 13, 14, and 25В m for the 12-m WorldDEM, 30-m SRTM, 30-m ALOS and 30-m ASTER DEMs, respectively. The model was calibrated and validated for only historical maximum flood event, i.e., Flood2010 using ManningвЂ™s вЂnвЂ™ values, flood stage at the Chakdara Bridge and satellite imagery-based Flood2010-observed extent.

In this study, 60В km long reach of the River Swat (Khwazakhela BridgeвЂ“Chakdara Bridge) was modeled using the HEC-RAS 2D model and high-resolution 12-m WorldDEM. Flood hazard assessment is a non-structural strategy for flood mitigation in addition to the structure measure. Swat valley in northern Pakistan is prone to frequent floods and was severely affected by the Flood2010 in the recent past. Floods are among the most devastating and recurring natural hazards and have caused extensive economic losses to human lives and infrastructures around the world.

Hec ras 2d manual