underground [Adjective] + drainage [Noun]

Strength Strength Dispersion
A:
7
CHISQ:
208.86
AWT:
15,980,107
TTEST:
2.56
G2:
41.98
FAWT:
3.4
MI:
4.99
LOGLOG:
14.01
JD:
0.45
MI3:
10.61
DICE:
0.68
RANGE: