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Sandbagging for flood protection

Click to enlarge

A properly built sandbag dike can prevent or reduce flood damage.

Bags must be filled and placed properly to give the best protection. Any available material can be used to fill sandbags, but sand is easiest to handle. Silt and clay will form a good dike but are more difficult to work with. Different size bags are available, but bags are easier to handle if weight is limited to less than 35 pounds. This is particularly important when teenagers or older persons will be handling the bags.

The number of bags needed for 100 linear feet of dike is:

800 bags for 1-foot-high dike
2,000 bags for 2-foot-high dike
3,400 bags for 3-foot-high dike


Site Selection: Select the location for the dike taking advantage of natural land features that keep the dike as short and low as possible. Avoid any obstructions which would weaken the dike. Do not build the dike against a building wall. Leave about 8 feet to maneuver between the dike and buildings.

Remove all ice and snow from a strip of land at least as wide as the base of the dike. If the dike is to be more than about 3 feet high, remove a strip of sod to provide better anchorage for the dike.

Overlap the sandbags as shown in Figure 2, placing the first layer of bags lengthwise of the dike and lapping the bags so the filled portion of one bag lies on the unfilled portion of the next. The base of the dike should be three times as wide as the dike is high, as shown in Figure 3. The second layer of bags should be perpendicular to the first layer, then alternate direction of the bags to the top of the dike.

Sealing the Dike: The finished dike can be sealed with a sheet of plastic to improve water tightness. Spread a layer of dirt or sand 1 inch deep and about 1 foot wide along the bottom of the dike on the water side. Lay polyethylene plastic sheeting so the bottom extends 1 foot beyond the bottom edge of the dike over the loose dirt. The upper edge should extend over the top of the dike. The sheeting should be about 6 mils thick. It is generally available in 100-foot rolls from construction supply firms, lumberyards and farm stores.

Lay the plastic sheeting down very loosely. The pressure of the water will then make the plastic conform easily with the sandbag surface. If the plastic is stretched too tightly the water force could puncture it.

Place a row of sandbags on the bottom edge of the plastic to form a watertight seal along the water side.

Place sandbags at about 6-foot intervals to hold down the top edge of the plastic. Place boards or dirt between the bags to prevent winds from disturbing the plastic. Avoid puncturing the plastic with sharp objects or by walking on it.




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On this site you'll find a variety of emergency preparedness products, services and information that is tailored specifically for small Businesses up to large scale Corporations & Government organizations. Our team of preparedness experts are here to assist you in your needs to better prepare your Organization before disaster strikes.


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Safety Central™ operates as an online safety and emergency preparedness store within a family of companies. It features items for individuals, The Federal Government, State Agencies, Red Cross, FEMA, Public and Private Schools, Institutions, Medical Centers, Corporations, Small Business and various other public and private agencies.

SafetyCentral.com provides quality emergency survival kits and supplies for home, business or vehicle, wilderness survival kits, medical first aid kits, supplies and gear for many types of emergencies and disaster preparedness. We offer a variety of kits and outdoor survival supplies you should have on-hand whenever venturing into the outdoors or surviving an emergency at home.

We are your source for all camping supplies, survival supplies or emergency supplies. So whether you need MRE (Meals Ready to Eat), a first aid kit for your office, or maybe a mosquito net or a camp stove, emergency kit for home or office, vehicle road safety kit, survival fire starter, survival food and water rations, a gas mask, or even an N95 respirator mask for bird flu or any other survival gear or emergency supplies, you’ve come to the right place! If you have any camping survival questions, one of our friendly and knowledgeable staff members will gladly assist you.

The survival gear and camping equipment sold at SafetyCentral.com is hand picked for quality. As a survival gear supplier for years, we've seen the best and worst of outdoor equipment. Whether you're stocking up for the emergency you hope never happens, or you're the outdoorsman that depends on rugged equipment to see you through extreme situations, you'll find quality items in our online store. Check back often as we'll be adding new equipment constantly including the best water purifiers, tents, emergency lights, backpacks, GPS units, knives, first aid kits, sleeping bags, compasses, binoculars, canteens and water pouches, portable showers, toilets and more. All outdoor activities require a variety of survival equipment and accessories to provide protection and enjoyment. We know you'll find those items here at Safety Central.

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