The following is an exerpt from the article, “Install Sewer Backflow Valves.” For more information please visit www.fema.gov.
Protecting Your Property from Flooding
In some floodprone areas, flooding can cause sewage from sanitary sewer lines to back up through drain pipes into buildings. These backups not only cause damage that is difficult to repair but also create health hazards.
A good way to protect buildings from sewage backups is to install backflow valves, which are designed to block drain pipes temporarily and prevent return flow. Backflow valves are available in a variety of designs that range from the simple to the complex.
Keep these tips in mind if you have backflow valves installed:
Changes to the plumbing in your property must be done by a licensed plumber or contractor, who will ensure that the work is done correctly and according to all applicable codes. They can advise you on the relative advantages and disadvantages of the various types of backflow valves.
- Valves should be installed on main waste drain pipes that leave the structure or that are connected to equipment that is below the potential flood level. Therefore, valves may be needed on washing machine drain lines, laundry sinks, fuel oil lines, rain downspouts, and sump pumps, as well as sewer/septic connections
- If you have a sump pump, it may be connected to underground drain lines, which may be difficult to seal off.
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