Assertion: hopper dredge | /r/ObjectUse | used for maintenance dredging
Facets:
value: mainly
type: DEGREE
value: in shipping channels
type: LOCATION
value: in exposed harbors
type: LOCATION
Source sentences:
text: Hopper dredges are used mainly for maintenance dredging in exposed harbors and shipping channels where traffic and operating conditions rule out the use of stationary dredges.