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Table 10-2 Chart Correction/Updates
Object
Item to be Reported
Likelihood of Aerial Observation
Airports, landing strips
New or discontinued.
New airfields are relatively easy to identify. Abandoned fields or runways marked with an “X” are easy to detect.
Bridges
New, removed, under construction, or ruins. Give location, type, lights, and vertical and horizontal clearances.
Many of these items can be easily seen from an aircraft. Clearance data requires ground survey.
Cables
Over or under navigable waters. Give location, type, and clearances.
Pylons for overhead cables are relatively easy to detect. Clearance data requires a ground survey.
Channels
New or revised channels. Indicate centerline, controlling depth and width discrepancies for existing channels other than Corps of Engineers’ project channels.
Changes in the flow pattern of a channel are often visible from the air. Depths and other information require ground based follow-up effort.
Coast Guard Station
New, discontinued, or change in facilities.
Best handled administratively rather than by aerial observation.
Cribs and water intakes
Visible or submerged. Give size and type of construction and depth if submerged.
General features visible. Ground follow-up necessary for technical and measurement data.
Dams
Type, position, lights, and other pertinent data.
New construction easily visible.
Dikes and levees
Type, height, and extent.
New construction easily visible.
Dolphin and other pilings
Visible or submerged.
Large objects are easy to detect.
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