discharge tunnel in right bank
flat-bottomed discharge tunnel
flood discharge tunnel with horizontal vertex flow
flood discharge tunnel with vertical vertex flow
horizontal swirl discharge tunnel
intake tower of discharge tunnel
redial gate of discharge tunnel
rotary discharge tunnel
side channel discharge tunnel
characteristic discharge
discharge characteristic
diversion tunnel and spillway tunnel
option of separate highway tunnel and Metro tunnel
railway tunnel under crossing the highway tunnel
Shield Tunnel and Rock Tunnel
water tunnel and salt tunnel