All Case Studies

Geospatial Underwater Mapping of Submerged Pipelines in Potable Water Reservoir

A submerged pipeline in a Northern California drinking water reservoir had inaccurate or unknown coordinates making underwater construction and maintenance of pipelines inefficient, costly and unsafe.

Industry: Potable Water Pipelines

Application: Mapping Submerged Pipelines

Product: Geospatial’s Smart Probe® and GeoUnderground® 3-D Mapping Application

The Challenge

A 38-inch pipeline was fully submerged in a potable water reservoir at a depth of 60-feet. The pipeline was “un-piggable” (i.e. un-traceable with a probe) by conventional means due to a 19-degree bend with 5 – flanges (4” thick). Also, due to the depth of the submerged pipeline, underwater construction and rehabilitation of pipelines was challenging, inefficient and labor-intensive. In addition, the coordinates of the pipelines in this particular case were inadequate and unknown.

The Solution

Geospatial’s immersive mapping technologies were deployed to provide efficient and accurate information that reduced costs, sped construction and maintenance, and provided a safer environment for the divers and crews. To perform this underwater task, Geospatial utilized their Smart Probe Mapping device in conjunction with a specialized carrier that could be hand-propelled by a team of hard-hat divers that were trained to perform this delicate work. The work was performed from a barge in the reservoir. Three teams of divers made a total of 6 - round-trip passes through the pipe, collecting a total of 12 data sets. Each pass of the 360-foot section of pipe took approximately 45-minutes, allowing each dive team to accrue two data-sets within their allotted 2-hour dive period.

After completion of the data-collection, Geospatial Corporation was able to verify consistency of the mapping results and begin post-processing at their headquarters. Upon completion, an accurate 3-dimensional map of the centerline of the pipeline was created. Geospatial’s findings were reported via AutoCAD and GeoUnderground for effective and adaptable use of the deliverable. This data is now readily available and useful for both the current construction needs, and for critical and immediate demands in the future.

The Benefits:

-Expertise in underwater mapping including the training of SCUBA divers with Geospatial Smart Probe Technology

-Acquiring accurate data and providing a safe environment for workers, even underwater.

-Delivering the data and findings, including an accurate 3-D map, via AutoCAD and our GeoUnderground mobile application for efficient use of the data for critical, immediate and future construction needs.