Hydrograph Flood Forecasting in the Catchment of the Middle Cheliff Mohammed Renima, Mohamed Remaoun, Abdelkader Boucefiane, Abdelkader Sadeuk Ben Abbes, and Abdelkader Bouderbala Contents 1 Introduction .................................................................................. 222 2 Material and Methodology .................................................................. 223 3 Results ....................................................................................... 228 4 Discussions .................................................................................. 228 5 Conclusions .................................................................................. 233 6 Recommendations ........................................................................... 233 References ....................................................................................... 235 Abstract The impact of climate changes on flood peaks was the subject of several studies. However, a flood is not characterized only by its peak but also by the time, duration of the tip, as well as the rise time and shape of the flood hydrograph according to geographical distribution, leading to an understanding of these extreme hydrological hydrographs and to detect areas vulnerable to flood hazards. The flood- duration-frequency observed rate of chronic Q(t) provides a theoretical multi-term flood quantiles description, directly meeting the needs of an integrated hydrological hydraulic modeling of the catchment. This article describes a statistical approach that aims to characterize the river in flood hydrology taking into account the notion of duration “d” and the return period “T.” We realize that samplings were carried out for flood flows of 04 gauging stations in the watershed of the middle Cheliff, which reveal a higher value than the threshold. For this analysis, F-d-F was requested to define synthetic mono-frequency hydrographs (SMFH). M. Renima (*) and M. Remaoun Laboratory of Chemistry Vegetable-Water-Energy, University of Chlef, Chlef, Algeria e-mail: renimamohamed@yahoo.fr A. Boucefiane, A. Sadeuk Ben Abbes, and A. Bouderbala Department of Earth Sciences, University of Khemis Miliana, Khemis Miliana, Algeria Abdelazim M. Negm, Abdelkader Bouderbala, Haroun Chenchouni, and Damià Barceló (eds.), Water Resources in Algeria - Part II: Water Quality, Treatment, Protection and Development, Hdb Env Chem (2020) 98: 221–238, DOI 10.1007/698_2020_539, © Springer Nature Switzerland AG 2020, Published online: 2 July 2020 221