###### Abstract  
The presented article provides a comprehensive study on the stability analysis of earth-fill dams under rapid drawdown and transient flow conditions used to prepare stability analysis charts by conducting coupled finite-element numerical and analytical limit equilibrium procedures. In this regard, the impacts of different rapid drawdown conditions on the safety factor of the Alavian earth-fill dam are determined. The slope stability charts present for both shallow and deep slip surfaces with various permeabilities are verified by ground information obtained with extensive instrumentation on the dam's site. The results showed that by decreasing the permeability of the core's material, despite preventing seepage, the instability risk of the upstream slope as a result of rapid drawdown intensifies. Also, as stability charts can be stated, with increasing the slip surface's depth and decreasing the hydraulic hydration, the reliability decreases, and the sliding surfaces' sensitivity increases based on the drawdown rates, which have been revealed to be from 0.2 to 0.6, the most critical state for safety factors, showing significant declines. earth-fill dam; transient flow; rapid drawdown; slope stability; coupled-stability analysis Article Coupled Numerical and Analytical Stability Analysis Charts for an Earth-Fill Dam under Rapid Drawdown Conditions Ali Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadiadi Azadi Azadi Azadi Azadi Azadi Azadi Azadiadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadi Azadidecrease in confining stress (\(\Delta\sigma_{3}\)) and will also increase or decrease in response to the deviation stress (\(\Delta\sigma_{1}-\Delta\sigma_{3}\)) changes. This issue leads to dire safety conditions on the dam's downstream slope. [PERSON] and [PERSON] [12] describe several upstream slope failures attributed to rapid drawdown conditions applied on 12 earth-fill dams based on field surveys and instrumentations. Interestingly, in most of the reported failures, the drawdown did not reach the maximum water depth but approximately half of it (from maximum-reservoir elevation to approximately mid-dam level). According to the obtained results, the main failure in dam slopes occurred during drawdown between a 10 and 15 cm/day discharge from the reservoir.