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How Flash Floods Increase the Risk of Pipeline Explosions

When you think of flash floods, damage to natural gas pipelines is probably not the first thing that comes to mind. However, there are about 3 million miles of gas pipelines running throughout our communities, near our homes, and along our roadways. These pipes link natural gas production and storage facilities to consumers nationwide, and they delivered about 27.7 trillion cubic feet of gas in 2020 alone. They can be severely damaged and may even explode as a result of flash flooding, endangering our homes, the environment, and our very lives.

Let’s take a closer look at flash floods, why they happen, and how they can cause devastating pipeline explosions. We’ll also consider what oil and gas companies can do to prevent flash flood pipeline damage in the first place.

About Flash Flooding

The National Weather Service describes flash flooding as “flooding that begins within 6 hours, and often within 3 hours, of the heavy rainfall (or other cause).” Flash flooding can happen anywhere. It can happen in big cities, small towns, and in the middle of nowhere. Whether it happens will depend on the amount of rainfall, the lay of the land, vegetation, the type of soil, and numerous other factors. In some situations, the same amount of rainfall over an urban area can cause flash flooding more than in the countryside or a suburban area because there is nowhere for the water to go; it cannot sink into the soil because there is none.

The San Jacinto River Fire of 1994

The effect of flooding on natural gas pipelines is not a new issue. Perhaps the biggest flood-related pipeline disaster in the United States occurred on October 20, 1994. Over the course of a few days, a storm system dumped more than 30 inches of rain over the Houston area in Texas, swelling the San Jacinto River out of its banks and into the neighborhoods nearby. As the floodwaters began to recede, a 40-inch pipeline ruptured. Hundreds of thousands of gallons of gasoline spilled into the river.

That was just the beginning, however. Several other pipelines also ruptured, and within a matter of hours, natural gas, diesel fuel, and crude oil had ignited and moved downstream, a burning mass that took nearly a week to die out. Flames shot 100 feet into the air. Boats and homes along the San Jacinto River burned. Dozens of people were treated for smoke inhalation and burns.

Why did the pipelines rupture? Before the river flooded and swelled, the pipelines were on the bank under about three to four feet of soil. Officials believed that the current washed the dirt away from around the pipes, causing them to collapse under their own weight. It was also believed that something could have struck one or more of the pipes as it was carried downstream by the swollen river.

Other Pipeline Explosions Caused by Flash Flooding

It’s been nearly 30 years since the San Jacinto River fire, and yet flash flooding continues to affect pipelines across the United States.

These are just a few recorded examples of pipeline ruptures, fires, and explosions that occurred as a result of flooding:

  • On October 21, 2016, localized flooding and soil erosion caused a pipeline rupture that led to the release of more than 1,200 barrels of gasoline into Loyalsock Creek in Pennsylvania.
  • On January 9, 2018, a 22-inch pipeline in Montecito, California ruptured due to heavy rains and flooding, causing a fire and explosion as well as the release of 12,000 MCF (1,000 cubic feet) of natural gas.
  • On January 29, 2019, a 12-inch pipeline in Harrison County, West Virginia ruptured after it was moved 10 feet from its original location by a landslide that occurred about 150 yards away.

How Rain & Flooding Affects Pipelines

Heavy rain and flooding change the weight and density of soil. If there is a pipeline underneath, changing soil conditions – particularly those caused by floods – could cause the pipe to bend and shift. Over time, such movement can eventually thin the metal and cause a rupture, similar to how bending an aluminum can over and over again will cause it to break. In severe storms, it could take a single flood or landslide to rupture a pipeline.

Pipelines that are buried in frequently waterlogged areas may actually “float” underground, and some operators attempted to address that problem by adding weights. These weights, however, were attributed to a 210,000 gallon Keystone line spill in South Dakota in 2017, according to a preliminary report by the Pipeline and Hazardous Materials Safety Administration (PHMSA).

Another risk flooding poses to pipelines is when it washes away the soil above and below a pipeline, unearthing it. This erosion can happen quickly, exposing pipelines to damage caused by floodwaters and the debris they bring, such as uprooted trees.

Both storage tanks and pipelines can be affected by flooding. In 2013, when parts of Colorado experienced over 15 inches of rainfall in just 8 days, many referred to it as the “100-year flood.” More than 51,000 oil and gas wells were in operation in the affected areas, and although operators stopped production, the flooding had disastrous results. There were 17 releases of produced water (the water that is produced during oil and gas extraction), totaling 26,385 gallons. There were 15 releases of oil, totaling 43,134 gallons.

Are Pipeline Operators Responsible for Preventing Flood-Related Damage?

In 2019, the Pipeline and Hazardous Materials Safety Administration sent an advisory reminding pipeline operators to identify and address hazards posed by landslides and flooding. The warning references Code of Federal Regulations (CFR) § 192.317(a): “The operator must take all practicable steps to protect each transmission line or main from washouts, floods, unstable soil, landslides, or other hazards that may cause the pipeline to move or to sustain abnormal loads.”

Gas and hazardous liquid pipeline operators must consider flash flood and landslide risks, and they must take reasonable measures to prevent pipelines from being damaged by these. When they don’t, they put their workers and everyone in the area at risk. They also endanger the environment.

Consequences of Flooding & Pipeline Explosions

Pipeline explosions caused by flooding can contaminate rivers and groundwater, polluting the environment and causing irreparable damage to wildlife, livestock, crops, and the people who live and work in the area. People can also be seriously injured or killed in the explosions and resulting fires, and they may see their property burned to the ground.

The risks of flooding are only expected to increase. Climatologists predict that a warmer atmosphere will lead to 40% more heavy rain in the Midwest and that rising sea levels will lead to a 45% increase in the nation’s floodplains by 2100. Unfortunately, companies continue to build in flood-prone areas.

We rely on pipelines to bring natural gas to our homes, businesses, and factories. Pipeline operators must take it upon themselves to ensure that the pipelines they build – and the ones they’re responsible for maintaining – can withstand the environmental changes we’re seeing, including flash flooding.

In the Aftermath of Pipeline Explosions, Arnold & Itkin Is There

When flooding and other natural disasters cause pipeline explosions, there is a root cause. Mother Nature cannot be blamed for a pipeline that was not buried deep enough, that was built in an area prone to landslides, or that was not designed to withstand flooding. As pipeline explosion attorneys, we represent workers, individuals, and families whose lives have been turned upside down by these devastating – and preventable – incidents. To learn more about our firm and the ways we can help you, call (888) 493-1629 today. We’re here to help, no matter what.


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