Uncontrolled withdrawal of reservoir water can cause an imbalance in the magnitude of the reservoir discharge itself. Sometimes the withdrawal of reservoir water is carried out too excessively, even to the point where the ground floor of the reservoir is visible. Especially if at that time the debit was not too large and the reserves needed for the next period were also not too much. This kind of thing must be stopped, and the solution is to regulate the reservoir through proper operation. The aim of operating the reservoir includes optimizing existing discharge. This research aims to find a method for optimizing discharge by considering the extraction limit with the Q Divided-Diffrent FLWL10 (MQDDF10) and Q Continuous FLWL10 (MQCF10) models. The optimization model is analyzed based on the height level (FLWL) of water withdrawal from the dead level (DL). The findings resulting from this research are a formula for optimizing reservoir water use by considering the lower limit for withdrawal from the reservoir. Another need is to know the balance between water availability and demand, as well as efforts to pay attention to the limits of sediment deposits at the bottom of the reservoir so that they are not transported when water is withdrawn. The numerical research approach is formulated simply and is built from the time the flow value analysis process is known. The research results show that the application of FLWL10 to MQDDF10 obtained sufficient Qout and provided a surplus Qdiff value to the reservoir Qend of between 11,251 m3 and 11,982 m3 per month during 2021–2035. Meanwhile, MQCF10 produces Qend-acc of 17,673 m3–35,135 m3 during 2021–2035. The MQCF10 results are caused by the initial excess discharge accumulated from 2021 to 2035. Furthermore, in FLWL15, from analysis with MQDDF15, it was obtained that the Qend of the reservoir at the end of the month was worth between 9,507 m3 and 12,475 m3 per month. Meanwhile, the results from MQCF15 obtained Qend-acc reservoir results of 1,467 m3–7,102 m3 . From MQCF15, it can be concluded that the higher the FLWL value, the greater the possibility of a shift in the Qend-acc value at the end of each month. This means that if the FLWL value is ≤ 10 (from the calculation the suitability value is ≤ FLWL13), the reservoir condition can be in surplus until 2035, whereas if the FLWL value is > 15, the reservoir discharge for needs is expected to experience a deficit in certain months. Even if FLWL > 20, the reservoir's Qend-acc will experience a deficit throughout the year.