Flood modeling of Naray-Khwar using HEC-RAS
Keywords:
HEC-RAS, River Analysis, Hydraulic Modeling, Total StationAbstract
Flood Hazard Assessment of a river helps in predicting their behavior under different conditions. In this study, HEC-RAS model was used to simulate the steady flow water surface profile of Naray-Khwar, one of the largest water conveyance Khwar running through Peshawar carrying sewage affected significantly by urban interference. The methodology involved collection of geometry and flow data to perform various hydraulic calculations. For proper analysis, Naray-Khwar is divided into three channels with one junction under Nasir Bagh Bridge. Naray-Khwar Upper and Regi-Khwar Upper flow on the upstream while Naray- Khwar lower flows downstream of the junction. Horizontal distances along the corresponding elevations of 16 stations were measured using a total station. Due to the non-availability of measuring gauges, flow data was determined using rainfall data of Peshawar gauging station and was then converted into run-off using WinTR20 software. Frequency analysis was then carried out to calculate 2, 5, 10, 25, 50 and 100 years flood. The analysis showed that while most of the reaches at upstream of Nasir-Bagh Bridge are safe, it is the downstream side where the banks are over-topped by a very large margin.
References
Adewale, P.O., Sangodoyin, A. Y., Adamowski, J., 2010. Flood routing in the Ogunpa River in Nigeria using HEC-RAS. Journal of Environmental Hydrology, 18, 1-11.
Ahn, J., Cho, W., Kim, T., Shin, H., Heo, J., 2014. Flood frequency analysis for the annual peak flows simulated by an event- based rainfall-runoff model in an urban drainage basin. Journal of Water, 6, 3841-3863.
Alsdorf, D. E., Ernesto, R., Dennis, P. L., 2007. Measuring surface water from space. Reviews of Geophysics, 45(2), 1-24.
Arora, V., Seglenieks, F., Kouwen, N., Soulis, E., 2001. Scaling aspects of river flow routing. Hydrological Processes, 15, 3, 461-477, DOI: 10.1002/hyp.161.
Bemani, M., Torani, M., Chezgheh, S., 2012. Determination of floodplain zoning by HEC-RAS Model. Journal of Geography and Environmental Hazards, 1, 16-20.
Bonaccorso, B., Brigandì, G., Aronica, G. T., 2017. Combining regional rainfall frequency analysis and rainfall-runoff modelling to derive frequency distributions of peak flows in ungauged basins-a proposal for Sicily region (Italy). Advance Geoscience, 44(1), 15-22.
Booij, M. J., 2005. Impact of climate change on river flooding assessed with different spatial model resolutions. Journal of Hydrology, 303, 176– 198.
Burby, R. J., 2001. Flood insurance and floodplain management: The US experience, Environmental Hazards, 3/3–4, 111–122.
Burnner, G. W., CEIWR-HEC., 2010. Hydrologic engineering center river analysis system user's manual, US army corps of engineer, Davis, USA.
Chow, V. T., 1959. Open channel hydraulics, McGraw-Hill Book Company; Inc. New York, 105.
Dhakal, N., Fang, X., Asquith, W., 2013. Return period adjustment for runoff coefficients based on analysis in undeveloped Texas watershed. American Society of Civil Engineers, 139(6), 476-482.
Knebla, M. R., Yanga, Z. L., Hutchisonb, K., Maidmentc, D. R., 2005. Regional scale flood modeling using NEXRAD rainfall, GIS, and HEC-HMS/RAS-a case study for the San Antonio River Basin summer 2002 storm event. Journal of Environmental Management, 75(4), 325-336.
Prata, D., Marins, M., Sobral, B., Conceição, A., Vissirini, F., 2011. Flooding analysis, using HEC-RAS modeling for Taquaraçu River, in the Ibiraçu city, Espírito Santo, Brazil. 12th International Conference on urban drainage, Porto Alegre, Brazil.
Saleh, F., Ducharne, A., Filipo, N., Oudin, L., Ledoux, E., 2012. Impact of river bed morphology on discharge and water levels simulated by a 1D Saint–Venant hydraulic model at regional scale. Journal of Hydrology, 476, 169-177.
Siddique-E-Akbor, A. H. M., Hossain, F., Lee, H., Shum, C. K., 2011. Inter-comparison study of water level estimates derived from hydrodynamic–hydrologic model and satellite altimetry for a complex deltaic environment. Remote Sensing of Environment, 115(6), 1522-1531.
Singh, V. P., 1988. Hydrologic Systems: Rainfall-runoff Modeling, Volume 1, Prentice Hall PTR, Englewood Cliffs, N.J.
Sunil, K., Sayali, K., Vrushali, B., Akshada, W., 2014. Flood modeling of river Godavari using HEC-RAS. International Journal of Research in Engineering and Technology, 3(9), 81-87.
Yongping, Y., Qaiser, K., 2011. Floodplain modeling in the Kansas River Basin using hydrologic engineering center (HEC) models. U.S. Environmental Protection Agency, Washington DC.
