Abstract
The objective of flood frequency analysis (FFA) is to associate flood intensity with a probability of exceedance and for making probabilistic estimates of a future flood event in Allala basin based on the historical discharge record at Sidi Akkacha gauging station, the peak floods discharge of Allala river for 5, 10, 50, 100 years return period are estimated using exponential distribution and the stage at different position of river are calculated using HEC RAS model . Based on the modeling study carried out considering 62 cross sections for 8 km length of river, The Output HEC-RAS model show that the existing embankments system on the banks of Allala River is not sufficient to resist the peak flood discharge of 100 years return period, water level profile shows that a maximum of 1.25m in left bank((at 1.2 km downstream) is needed to protect the inundation of the low laying areas of Old tenes.
Highlights
Floods are natural disasters that afflict almost all regions in the world today
The present study based on an a series of hydrometric data where they are recorded at the Sidi Akkacha hydrometric station during the period from 1973 to 2017 and rating curve with gauging data, they were provided from National Agency of Water Resources (NAWR) of Blida, as showing figure 2
Flood peak discharge will be used as input for the hydrodynamic model HEC–RAS
Summary
Floods are natural disasters that afflict almost all regions in the world today. The threat of flooding is a natural disaster that most frequently cause loss of property and lives [1] ,estimates of the size and frequency of floods is important for infrastructure planning and design and in the management of water resources and riparian areas [2] Research on flood frequency has focused on the estimation of extreme flood events, rather than the more frequent small to moderate magnitude flood events which dictate alluvial channel morphology [3,4], Flood inundation models play a central role in both real time flood forecasting and in flood plain mapping [5] ,the HEC RAS is one of this models, Already many authers using this models for modeling flooding in various countries where the results were satisfactory [6,7]. The objective of this study is to forecast the flood water surface profile on a return period of 50 and 100 years.
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