Protecting Your Chemical Storage Area from Storms and Floods
Farmers, businesses, and homeowners need to consider all the chemicals they have stored when they prepare for a flood or storm event. In the rush to prepare for the imminent arrival of a storm, many people overlook the potential complications that can arise if toxic materials fall victim to high winds and floodwaters.
In the southeastern United States, a number of tropical systems have severely impacted chemical storage areas associated with agriculture. One memorable example was the November 1985 flood in Virginia and the surrounding region. Heavy rainfall from October 31 through November 6, 1985, caused record-breaking floods over a large region, including western and Northern Virginia. Most of the rain fell on November 4 and 5 and was indirectly related to Hurricane Juan. New maximum peak discharges were recorded at 63 stream-gauging stations during this flood. In the Roanoke area, 10 people died as a result of the flood. There were 22 total deaths in Virginia. The cost of this flood for the Roanoke-Salem area was estimated to be $440 million (see USGS report at http://va.water.usgs.gov).
One impact of this flood was the hazardous chemicals that washed from farms and other locations into streams and rivers. Emergency service personnel recovered these materials from waterways for months after the event. Unfortunately, many items were never found, and others were discovered only after they were involved in an incident. One such event involved the poisoning deaths of more than 30 cattle on a Northern Virginia farm. The cattle had eaten a quantity of granular insecticide that had washed from a storage building into a pasture. The farmer turned his cattle into the pasture, not realizing that the insecticide was present.
Fertilizers, pesticides, fuels, oils, solvents, and other chemicals stored on farms, golf courses, farm supply stores, pest control businesses, home and garden centers, nurseries, greenhouses, and other agricultural sites pose a potential hazard to the environment and to public health during any severe weather event. Containers may be punctured and leak, and drums or jugs may be swept away. As a result, water supplies may become contaminated, and pesticide containers may endanger people who find them. Preparation is the best defense to prevent these situations from occurring.
Before the Storm
- Before a storm ever appears on the horizon, you should have a plan for dealing with disasters for your storage area and your business or home. An excellent resource for emergency planning is available through READYVIRGINIA.GOV, a service of the Virginia Department of Emergency Management. Make sure your insurance company is part of this plan. Keeping your insurance up-to-date is critical to protect you from losses. Make sure you share a detailed inventory of your stored chemicals, including receipts, with your insurance agent.
- Most chemicals should be stored away from your living and working areas. To avoid complications from weather events, avoid locating chemical storage areas in a floodplain or less-sheltered areas where wind could easily damage a building. Maps are commonly available that show the location of the 100-year floodplain in most areas. Knowing this information is a good way to prevent a problem in most flooding situations.
- Storage areas should also be located downwind and away from sensitive areas such as homes, schools, streams, ponds, and any area that might impact people and animals.
- Building design has a great deal to do with prevention of damage by the wind and water. Choose designs that can resist high winds that might damage a roof and lead to the building collapse. Proper drainage around a building is important to keep floodwaters in check. Flash flooding can occur anywhere, so don't think that locating a building away from a floodplain solves all potential flooding problems. The MidWest Plan Service offers plans for pesticide and fertilizer storage buildings. Consult your local Extension agent for help with these and other plans for agricultural buildings. In addition, you should consider buying a pre-fab chemical storage building if you are seeking to build or upgrade your site. Pre-fab chemical storage buildings are far superior to stick-built buildings because they are specially designed to resist most problems associated with chemical storage and comply with regulations and insurance standards. References to pesticide storage technology of this type can be found on this website.
- Keep your chemical inventory to a minimum by only buying what you need for one season. Consider contracting with a commercial applicator to do your application to eliminate storing most pesticides and fertilizers. Any chemicals you do store should be inventoried anytime you turnover items stored at your location. Keep the inventory list up to date and a copy available on site and a second copy at a safe location away from the site. Make sure you keep a paper copy of the inventory. If the power is out, a computerized inventory system becomes useless.
- Learn about the weather. Doing so will help you understand the prediction system used by the weather service. Install a NOAA weather alert radio that keeps you up-to-date on weather emergencies. This is particularly important if you live in a storm- or flood-prone area. If you have web access you should monitor the weather on the National Weather Service website at WEATHER.GOV. This site has access to your local weather and to the National Hurricane Center to monitor tropical systems that might require days of preparation on your part before they enter your local area.
- If your storage is already located in a vulnerable area, try to move chemicals to higher ground. If that isn't possible, you may be able to minimize water damage by moving chemicals off floors and from lower shelves to a higher, but appropriately safe, location in the building or elsewhere on-site.
- Shelving areas should be anchored to prevent them from tipping over from wind or water movement through the building. Turn off the building's electricity; plug drains leading from the building if you think water will enter the building through them or if you think pesticides can escape through them to the environment. If plugging drains will make the flooding in the building worse, move the pesticides to another location. If the drains lead to a sump, make sure the sump will not become buoyant and lead to building damage.
- Let local authorities know where your chemical storage areas are located before a potential disaster event starts to develop. Before the event, make sure the building is well marked as a chemical storage building. Make sure the building is well-secured and locked before evacuation.
After the Storm
- Check the building for water and wind damage, for fumes, and for poisonous snakes and harmful insects before entering.
- If the building is damaged, don't enter it without protective clothing and equipment.
- If you know there are damaged containers in the building, get help from local authorities. Do not enter the building.
- If containers have been washed or blown out of the building, restrict entry to the affected area to prevent exposure to humans and animals. Get help to clean up the materials to prevent further pollution.
- Check all pastures and feeding areas before turning animals loose after a storm. As was the case in the example cited above, had the grower checked this area, he might have saved his cattle.
- Be prepared to contact authorities to report spilled quantities of chemicals and to request assistance.
- For all emergencies, please contact local emergency services by dialing 911 to report incidents and to get help.
- In Virginia, spills and pesticide incidents affecting the public, must be reported (by authority of law) to the Virginia Department of Agriculture and Consumer Services - Office of Pesticide Services within 48 hours. Their phone number is (804) 371-6560.