highest working water level

lowest working water level

water out level division

critical water level

raising of water level at Tongguan Station

water level at Beicun

water level at the end of year

water level at Tongguan station

water level at Yichang station

water level period fluctuation

Water level-water area Curve

At working positions

continuous working period

critical working areas

critical working procedure

Critical working section

dynamic working level

Expected Working Period

manufacturing and precasting at working site