Depth of Cover Surveys for Waterway Crossingsby Morgan Wolaver, WIMPOL, Inc, Houston, United States,
Abstract: The majority of pipelines cross at least one waterway of some type, especially the interstate lines which from start to end cross numerous bayous, canals and major rivers. These waterways are in a constant state of change. River bank erosion, bottom scouring and dredging are just some of the processes that can expose pipelines. Exposure may subject the pipeline to potential failures due to stress fatigue and corrosion from coating loss. Scheduled monitoring and archiving of pipeline cover and bank loss can reduce these exposures or provide less stressful time frames to prepare for replacement. Over the last decade technology advances in pipeline detection have developed improved methods of probing, geophysics, and electromagnetic to efficiently determine depth of cover over pipelines. Electromagnetic technology has made some of the most promising strides forward. Coupled with an accurate total station survey instrument, water depth recorder and personal computer (P.C.) WIMPOL's electromagnetic system has provided rapid, detailed depth of cover and erosion surveys. Computer aided drafting has provided a means to present precise detailed survey data for interpretation archives and efficiently modify drawings for remedial action if required.
Subject Headings: Pipelines | Cables | Erosion | Hydrographic surveys | Computer aided design | Dredging | Corrosion
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