Dam material

Permeability coefficient

/(m・s−1)

Dam material

Permeability coefficient

/(m・s−1)

Core wall

2 × 10−9~2 × 10−7

Fine rock transition material

2 × 10−3

I anti (Dr = 0.8)

2 × 10−5

Upstream and downstream cofferdam

1 × 10−2

II anti (Dr = 0.85)

2 × 10−3

Curtain

5 × 10−8

Ⅰarea of rockfill

1 × 10−2

Weakly weathered rock mass

5 × 10−7

Ⅱarea of rockfil

8 × 10−4

New rock mass

1 × 10−7