Designing effective flood protection structures in Algeria necessitates accurately calculating the maximum discharge of wadis. Due to the lack of field measurements, traditional methodologies are often utilized. Yet, these methods fail to account for the region’s unique characteristics, resulting in considerable variations and complicating the selection process. This article introduces a novel approach for estimating the maximum discharge in the absence of flow rate data. The proposed model, formulated as Eq. (3), employs statistical modeling and incorporates factors such as watershed area (A) and rain concentration time (Ptc) for a specified frequency (P%). This model offers a robust alternative to traditional methods, including the Sokolovsky method (1958–1968), by providing more accurate discharge values tailored to the hydrological conditions of Algerian wadis.