Cofferdams and Caissons

A Caisson is a watertight structure used for retaining water in order to work on the foundations for bridges, piers, and other structures. Generally speaking, the water is pumped out to create a completely dry work environment. Some caissons can be open-air caissons, whereas others may use compressed air to keep the mud and water out. Installation involves pushing it into the mud, until it reaches clay or another solid foundation. Due to the pressures inside of caissons, there are many risks to the workers.

There are four main types of caissons:

Box

Box caissons are put into place and filled with concrete, and may make up the foundation for other structures. These caissons must be anchored to allow them to remain in the proper position until they have been filled with concrete.

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Are Sandbags the Right Solution for You?

Are Sandbags the Right Solution for You? The Environmental Agency of the UK, as well as many experts in the field of flood protection agree that sandbags are ineffective for groundwater flooding, and are only useful when combined with plastic sheeting.Sandbags are time consuming and difficult to handle, and are susceptible to seepage and leakage. …

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Flood Mitigation Strategies

Adding Cofferdams to Your Flood Mitigation Strategies

Flooding affects more homeowners than and other natural disaster, according to FEMA. As of 2015, the average claim for damage caused by a flood was over $46.000. Flood mitigation strategies are necessary for those who wish to protect their home.

Flood mitigation strategies - flood protection for homes
This chart shows the hardest hit states in terms of the total number of claims, and the total amount of claims payments.

How Can I Protect My Home?

There are many steps you can take as a homeowner to protect yourself from a possible flood scenario. The first step you may want to take is to perform a risk assessment. FEMA offers a one step flood risk profile. You should also have contingency plans in place for dealing with communication during an emergency, as well as having an emergency kit on-hand. Unfortunately, most homeowners insurance does not actually cover damage from floods.

If you live in a high flood risk area, here are a few tips to help minimize the impact of a flood on your home:

  • Ensure that your basement walls have been completely waterproofed
  • Use “check valves.” These valves stop the reverse flow of water and will help to stop flood water from backing up into your home’s drains
  • Elevate your furnace, electric panel (circuit breaker,) and your water heater off of the ground to a reasonable level that you are able to accommodate
  • If you are in a particularly flood-prone area, you may even consider raising the outlets to the mid-level of the walls in your home
  • Construct barriers around your home to keep flood waters out

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Using Cofferdams for Dewatering

Flood protection - a cofferdam guarding a building

During the course of a construction project, it may become necessary to employ a dewatering method remove the water from the area, therefore allowing the project to move forward. This can be done several different ways. In this article, we will focus on water filled dams (or cofferdams.) Typically, a cofferdam is a temporary enclosure …

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