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By N2H

Leakage Of Virgin Rock

The holes at the toe should be spaced closer together and successively broken from the front row.

d

44-51 mm

1 3/4-2″

L1

30-40 cm

1′-1′4″

L2

60-90 cm

2′-3′

D

Add 5% of Height

80°-90°

The front holes (up to the sixth row) may be simultaneously filled in. It is more effective for the removal to fill in 1 holes and then each two rows (2,,3) after a delay of 6-20 hours.