During floods events, streambed infiltration is often considered the main recharge method. This study integrates field, and theoretical research to explore transmission losses, infiltration, aquifer recharge, and Managed Aquifer Recharge (MAR), in ephemeral flow systems. Using Modflow's RPM package, the riverbeds seepage in steady-state conditions was quantified. Floods disappearance duration was determined based on floods bed hydraulic conductivity coefficients. The Flash Floods Disappearance Distance Method (FFDDM), was introduced, utilizing field data, and research insights to investigate infiltration mechanisms, and floods disappearance distances (LDF). Three scenarios for the riverbeds alluvial sediment thickness (Mriver), 10, 20, and 30 m - were considered, along with three hydraulic conductivity coefficients (Kriver), values - 0.05, 0.01, and 0.005 m/s - for rainfall return periods of 20, and 100 years. Flash floods exhibited vertical hydraulic conductivity ranging from 0.05 to 0.005 m/s, averaging 0.01 m/s in 20-meter alluvium (Mriver). The research suggests that MAR construction might not be necessary for the Kamal Abad district, as hundred-year floods typically infiltrate the bed. Infiltration depends on various factors including sediment thickness, precipitation intensity, flash floods discharge, grain size, and the riverbeds hydraulic conductivity.