FLOOD CONTROL DITCH
Pipeline Exposure Repair
A pipeline right-of-way (ROW) with two 8-inch pipelines and one 10-inch pipeline parallels a flood-control ditch near residential homes. Bank migration had exposed the pipelines; the largest pipeline exposure was approximately 136 linear feet. Submar worked with a geotechnical survey company to establish subsurface soil conditions, find the location of the existing slope, and develop geotechnical engineering recommendations for pipeline exposure remediation.
NORTH FORK BLACK HAWK CREEK
Lateral migration caused by the meandering stream exposed two 26-inch diameter pipelines that cross North Fork Black Hawk Creek in Iowa. Submar employed its proven streambank stabilization techniques to address and resolve this pipeline exposure.
NORTHWEST BRANCH ANACOSTIA RIVER
A 22-inch diameter natural gas pipeline that crosses the northwest branch of the Anacostia River in Maryland had become exposed due to bank erosion and lateral migration of the channel. Previously placed rock failed to remediate the pipeline erosion issue. If left uncovered and unprotected, the pipeline exposure risked further damage due to continued erosion.
Pipeline Erosion Control
An 8-inch diameter propane pipeline that crosses Panther Run in Pennsylvania was exposed for approximately 12.5 linear feet due to several factors: all-terrain vehicle (ATV) traffic had created several small streams over the pipeline, the channel bed of Panther Run had degraded, and the banks had begun to migrate. If left uncovered and unprotected, the site risked potential damage due to continued pipeline exposure.
RIVER ROAD EXPOSURE
Pipeline Erosion Control
A 10-inch diameter natural gas pipeline crosses a tributary to Big Blue River in Indiana. A headcut – an abrupt drop in the bed of the channel – had developed in a small drain that flows in to Big Blue River, exposing the pipeline for approximately 11 linear feet and suspending it for approximately 12 linear feet. If left uncovered and unprotected, the pipeline risked further exposure and possible damage due to unchecked pipeline erosion.
CASE STUDY - CANAL PROTECTION
A 6-inch diameter natural gas pipeline crosses a canal in Florida. Sheetflow from the adjacent street and high flow events’ impact had exposed the pipeline. 3-in-1 concrete bags had been placed atop the pipeline in an effort to protect it, but the sheetflow and high flow events had removed cover behind the bags. If left unprotected, the site risked further damage due to continued pipeline exposure.
Pipeline Exposure Repair - MSE Wall
A 15-foot deep erosion rill had formed in an unnamed wash due to storm water flows, exposing one of four natural gas pipelines in the area. If left uncovered and unprotected, the pipeline risked further exposure and potential damage due to continued erosion.