根据国家防汛总指挥部和水利部有关指示精神,各大江河堤垸都要确定抗洪保证水位。我省洞庭湖区确定的“三防水位”(防汛水位、警戒水位和危险水位)是作为汛期各阶段部署防汛工作的依据,对取得防汛工作的胜利起到了积极作用。现确定堤垸抗洪保证水位不仅是全面衡量堤垸抗洪能力的指标,又是堤垸抗洪保安的责任目标, According to the State Flood Control Headquarters and Ministry of Water Resources relevant instructions, the major rivers embankments have to determine the flood guarantee water level. The “Three Waterproof Positions” (flood control water level, warning water level and dangerous water level) determined by the Dongting Lake area in our province serve as the basis for flood control deployment in all phases of the flood season and play an active role in securing the victory of flood control work. Now it is determined that the water level of flood embankment is not only an indicator of flood resistance capacity of embankments but also the responsibility target of embankment flood control and security.