E
X A M P L E
:
T h e n ext i mag e d emon s tates th e s i g n atu r es c au s ed b y a voi d u n d er th e r oad . A
d i p i n th e r oad w as th e f i r s t i n d i c ati on th at th er e w as s ometh i n g w r on g an d th e
GPR s u r vey an d th e r es u l ti n g GPR p r of i l e r eveal s th e exi s tan c e of a voi d ab ove a
d r ai n ag e c u l ver t.
