# How do you calculate backfill and excavation?

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## How do you calculate backfill?

For example, find the cubic footage volume of a backfill area that is 8 feet wide, 6 feet deep and 50 feet long. The volume of a rectangular cubed shape is found by the formula v = l x w x d, where v represents volume, l is the length of the trench, w is the width and d is the depth.

## How excavation is calculated?

The outlay of excavation is determined by the excavation’s depth, sort of soil, technique of excavation to get conducted as well as the span wherein the excavated soil needs to be removed. The outlay of all those are included with regard to excavation’s unit volume to obtain the excavation’s rate.

## How do you calculate dirt excavation?

Add the length at the top of the excavation to the length at the bottom of the excavation and divide by 2 to get the average length. Do the same for the width. Multiply the average length times the average width times the average depth and divide by 27.

## How do you calculate excavation cost?

The cost of excavation is generally estimated by multiplying the total excavation volume to the excavation price per unit. For ex : Let us assume that you want to excavate a pit of size : 2 x 2 x 2 meter. The market price for excavation is 10\$/cu.

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## How do you calculate fill?

Calculate the amount of fill needed with this formula: Width x Length x Depth divided by 27. All these dimensions should be calculated in feet. For example, to find the volume of an area 25-feet wide by 36-feet long with a depth of 3-inches, enter 25 x 36 x .

## How do I calculate foundation excavation?

So, the formula is: Ab = Wb * Lb, where Wb and Lb are the width and length of the bottom of the excavation. At = Wt * Lt, where Wt and Lt are the width and length of the top of the excavation.

## How do you calculate slope of excavation?

For example, if the trench is 6 ft deep and 20 ft wide across the end of the trench and the bottom of the trench is 2 ft wide, the slope can be calculated as follows: Horizontal distance = 20 ft – 2 ft ÷ 2 = 9 and the Vertical depth = 6 ft; Slope = 9 ÷ 6 = 1.5 to 1, which is the slope needed for type C soil.

## How is earthwork excavation calculated?

To calculate the earthwork estimate requires multiplying the area by the difference between the average of two sets of levels. Formula: Volume = Area * Difference between the average of two sets of levels.

## How do you calculate fill dirt on a slope?

Length in feet x Width in feet x Depth in feet (inches divided by 12). Take the total and divide by 27 (the amount of cubic feet in a yard). The final figure will be the estimated amount of cubic yards required.

## How do you calculate backfill on a trench?

Backfill for Figure 3.1:

1. Backfill volume = excavation volume – footing volume – wall volume. …
2. (Note that only the portion of the wall that is in the trench is deducted, so the height of wall in the trench is the average trench depth minus 2′-0” for the footing: 6′-0” – 2′-0” is 4′-0”)
3. Backfill volume = 207.4 cubic yards.
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## How do you calculate dirt grade?

Grade can be found by measuring the horizontal length of an elevation, the run, and the vertical height of the elevation, the rise. Grade is expressed as rise/run, so if the rise is 25 and the run is 80 the grade is 25/80.

## How much does dirt expand when excavated?

When it comes to light soil excavation, the shrink may range from 20-40% or more. Moderate soil excavation shrink ranges from 10-25%. Heavy soil excavation with deep cuts and fills shrink approximately 15% and swell around 5%. These averages are helpful to know and use as a guideline.

## How much can an excavator dig per hour?

As a standard amount, you can expect an excavator such as the Kubota U17-3a to move 40 cubic yards in an hour, but this will vary based on what you drive. You can get a better idea of excavation rates by doing your research before hiring a particular machine.