# How to Calculate a Sandbag Wall

Sandbag walls can protect your home from flooding.

A sandbag wall is a form of protection for your home, garden or business against rising flood waters. To be effective, a sandbag wall has to be constructed correctly. According to the U.S. Army Corps of Engineers, sandbag walls are only effective up to a height of 5 feet. If you need a higher level of wall, sandbags are not the right option. The preferred height for a sandbag wall is 3 feet high. You'll need to get bags and sand from a local hardware or home supply store once you calculate how many bags you need.

## Step 1

Measure the length of the area that you plan to protect. Determine the number of feet in length that your wall will need to be.

Video of the Day

## Step 2

Determine the height in feet that your wall needs to be. You can get some assistance on deciding this from the local government's environmental, building inspections or natural resources department.

## Step 3

Determine how many sandbags you'll need. Use the following scale to determine how many sandbags you need per linear foot of wall based on the height of the wall. A 1-foot wall needs five bags per foot, a 2-foot wall needs 10 bags per foot, a 3-foot wall needs 21 bags per foot, a 4-foot wall needs 36 bags per foot and a 5-foot wall needs 55 bags per foot.

## Step 4

Multiply the number of bags needed per foot by the total length of the wall. For example, a wall 20 feet long that is 3 feet high needs 420 sandbags.

#### Warning

Sandbags need to be filled correctly in order to stack solidly and hold back water. See References for a link to the U.S. Army site describing how to correctly fill and stack sandbags.