normal level of water supply
The normal full water level is the highest water level that can be stored in the dam lake for water utilization purposes (water supply, irrigation, industrial water, etc.) during normal times (non-flooding). The water level can be used from this level to the lowest level. Each dam has its own set of operating rules, and the full water level is determined based on the elevation of each dam, and the rules for operating gates, etc. are based on this level.