1 Your measurements

Type feet and inches the way you'd write them, like 12' 6" or 30 3/8. Decimals work too.

ft
Measure along the line the sandbags will follow. Keep the dike at least 8 ft away from the house: NDSU warns that a dike built against a wall pushes on the building.
ft
We add 1 ft on top, as NDSU Extension recommends, so the dike is built higher than the water.

2 What you need

Sandbags
1,050
for a 2 ft high dike
Sand
14 yd³
about 20.8 tons
Base width
6 ft
3 × the height (Corps)
Dike height2 ft: your flood depth plus 1 ft of extra height
Bags per 100 ft2,100
ShapeCorps pyramid, base 3 × height
Sand14 cubic yards at about 75 bags of 40 lb per yard, plus about 2 yd³ per 100 ft for the bags that hold the plastic down

Keep the dike at least 8 ft from the house: NDSU warns a dike built against a wall pushes on the building. Seal the water side with plastic sheeting, never under the bags.

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