官厅水库已运行30多年,随着泥沙的淤积,水库的防洪标准已逐渐降低。为此,水利电力部决定扩建其溢洪道,将原20m宽的溢洪道向左侧山体内扩大32m,形成长为532m、净宽为52m的新溢洪道。此外,将由原来2孔(10m×11.6m)平板闸门组成的闸首改建为4孔(13m×15m)弧形闸门闸首,泄洪能力 Guanting Reservoir has been in operation for more than 30 years. With the siltation of sediment, the flood control standards of the reservoir have been gradually reduced. To this end, the Ministry of Water Resources and Electricity has decided to expand its spillway and expand the original 20m wide spillway to the left side by 32m to form a new spillway of 532m in length and 52m in net width. In addition, the gate head of the original 2-hole (10m × 11.6m) slab gate was converted into a 4-hole (13m × 15m) gate gate with flood discharge capacity