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Fill Dirt in Gober, TX

In this article, we'll see how an estimator would use the cross-section method to calculate cut and fill for a construction site.

Before any construction can begin on a building site, it must be graded. In grading a building site, areas where the elevations are too high are "cut" or lowered down to the proposed elevations. Areas where the elevations are too low are "filled" or raised to the proposed elevations. fill dirt in Gober, TX. Grading a building site requires a lot of time, equipment, staff and money. Accurately calculating the amount of work or cut and fill required to grade a site is necessary to prepare an accurate bid.

Overview

In the cross-section method, the estimator divides the site using a series of equally spaced horizontal cross-section lines that span the entire drawing from east to east. He then plots both the existing and proposed elevations on graph paper for each of the horizontal cross-section lines. For each of the cross-sections, he then determines the cut areas and fill areas. Then for each pair of adjacent cross-sections he averages the cut areas and fill areas and multiplies them by the spacing of the cross-sections to determine the cut and fill volumes between the adjacent cross-sections. He then sums all of the cut volumes in all of the fill volumes to determine the total cut and fill volumes for the site.

Step-by-step

Here the steps required to calculate cut and fill using the cross-section method:

Using a T-square, draw a series of equally spaced horizontal sections (ie cross-section) from East to West across the entire drawing. The spacing of the sections depends upon the complexity of the drawing. Drawing of high complexity should have their sections drawn one half-inch apart. Drawings of moderate complexity should have their sections drawn 1 inch apart. Drawings a low complexity should have their sections drawn between 1 and 2 inches apart.

Prepare a piece of graph paper for each horizontal section line. Draw a horizontal axis for the distance along the section from the left edge of the plan. Draw a vertical axis for the proposed and existing elevations using the lowest and highest elevation on the plan.

For each section, plot the existing elevations versus the distance from the left edge of the plan.

For each section, plot the proposed elevations versus the distance from the left edge of the plan.

For each section, calculate the number of squares where the existing is above the proposed surface. Then multiply the number of cut squares by the actual area of each grid square. This is the total cut area for this section.

For each section, calculate the number of squares where the existing is below the proposed surface. Then multiply the number of fill squares by the actual area of each grid square. This is the total fill area for this section.

For each pair of adjacent sections, add the two cut areas together and average them by dividing that total by two. Then multiply the average cut area by the distance between the two adjacent sections. This is the cut volume between that pair of sections.

For each pair of adjacent sections, add the two fill areas together and average them by dividing the total by two. Then multiply the average fill area by the distance between the two adjacent sections. This is the fill volume between that pair of sections.

Sum up all of the cut volumes for the plan and note it on the drawing.

Sum up all of the fill volumes for the plan and note it on the drawing.

Calculate the import or export for the site by subtracting the total fill volume from the total cut volume. If there is more cut than fill, then this is an export site and soil will need to be trucked away and disposed of. If there is more fill than cut, then this is the import site and so fill dirt in Gober, TX will need to be purchased and trucked onto the site.

The total cost for the site grading will be based on the total cut and fill volumes, and the total amount of either import or export from the site.

Plan to spend 10 hours or more for each sheet in your cut and fill take off. Expect and accuracy of +/-15% when using the cross-section method.

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