1992年7月2日到5日,钱塘江流域普降大暴雨,龙游站降雨量达380mm,兰溪以上流域面积平均降水量143mm。7月4日15时,富春江水电站预报最大入库流量为15900m~3/s,大大超过了富春江以下堤防的行洪能力。在浙江省防汛指挥部领导下.决定抓住洪峰尚未到达之前.提早加大富春江水电站的泄量,以腾出库容,削减入库洪峰。7月4日15时15分,富春江水电站入库流量为7280m~3/s,下泄量加大到12000m~3/s;17时20分,富春江电站入库流量为9018m~3/s,下泄量则加大到下游堤防的最大忍受能力——12500m~3/s。到21时,富春江电站的库水位已由正常运行水位的23.00m下降到21.71m,预腾出削峰库容0.71亿m~3。 July 2, 1992 to 5, heavy rains in the Qiantang River Basin, Longyou station rainfall of 380mm, Langxi basin area above average rainfall of 143mm. At 15:00 on July 4, the maximum flow rate of the Fuchunjiang hydropower station was predicted to be 15900m ~ 3 / s, far exceeding the flood discharge capacity of the dikes below the Fuchun River. Under the leadership of the Flood Control Headquarters in Zhejiang Province, it decided to seize the flood peak before it reached the airport, and to increase the discharge of Fuchunjiang Hydropower Station earlier so as to free up storage capacity and reduce the storage peak. At 15:15 on July 4, the flow rate of Fuchunjiang Hydropower Station was 7280m ​​~ 3 / s, and the discharge volume was increased to 12000m ~ 3 / s. At 17:20, the inflow of Fuchunjiang Power Station was 9018m 3 / s , The discharge volume is increased to the maximum capacity of embankment downstream - 12500m ~ 3 / s. By 21:00, the reservoir water level of Fuchunjiang Power Station has dropped from 23.00m in normal operation to 21.71m, with a peak storage capacity of 87 million m 3 preempted.