Cross Section (End section) Earthwork Calculation

Land Development Engineering

Download: Spread Sheet Calculations of Cross-Section calculations

Cross-section (end section) Directions (in progress) - calculate cut and fill by taking "slices" along a base line

Cross-section/ end-section

1. Create your proposed contours

    -keep in mind you cut/fill specs

2. Place your base line (the line which the cross-sections come off) it should be generally parallel to your  grading plans

3. Choose your cross sections where your grading plans change (they do not have to be equal interval)

4. Use the edge of a sheet of paper to mark where the contours lie on a cross section (this will save you from measuring the distances between the contours)

    -be sure to identify proposed (dashed lines) or existing (solid lines) contours and elevation

5. On a piece of graph paper you will draw profiles of your cross-sections

    -determine your vertical exaggeration by using your engineer's scale and finding the scale closest to the grid marks on your graph paper

6. Using the edge of the paper where your marked your proposed and existing elevations as your x-axis mark the elevations

7. On your profile connect the existing dots with a dashed line and the proposed dots with a solid line (the areas between are what we will determine when we digitize the profiles)

label scales for both the horizontal and vertical axis

8. fold your scrap piece of paper and repeat steps 4-7 until you have created profiles of  all of your cross sections


9. Once you have made all of your cross-sections make coordinate systems (in inches) on your paper (0,0 for your bottom left hand corner, go x inches to the right using the 1:10 scale and call that point x,0, do the same for coordinates 0,y and x,y)

10. then open land desktop or auto cad (Auto CAD worked best for me)

11. Use the Layer Manager to create a new layer for each profile then you can save them all, and can see one profile at a time by turning off all layers by one I named mine according to the distance from my zero disturbance line (typically use station (ei: 0+00, 0+50, 1+00...) for the names of cross-sections)
autocad 1

12. type the following commands:

13. digitize each point, press the 1 button on the tablet

enter the inches coordinates (see diagram)

14. press enter to when you finish calibrating all four points

15. check out your error (under 1 your doing OK) then choose orthogonal (O)

16. now digitize the area between your proposed and existing profile

17. Type PL

18. Choose your point of first disturbance

19. choose the next point to be the consecutive Proposed

20. then follow digitizing the next proposed contour

21. just click on the points it will make straight lines in between

22. after you have digitized all of the proposed points go back up the hill and digitize all of your existing contour points

23. finish by closing the polygon - use fill grade and cut grade to extend the proposed line until you meet grade

24. you may have two areas make sure to differentiate between cut and fill areas (so you can enter it into the right column on the spreadsheet)

25. you can separate your two areas by using the command: BPOLY

26. in the menu that pops up choose the  pick point button

27. click in the separate polygons (dotted lines lines should appear inside the new polygons)

28. and drag them away from each other to make sure you have two new polygons

29. then use your area commands:

30. then select one polygon

31. then type the area into the spreadsheet in the cut or fill digitized area in^2

32 Repeat steps 12-32 until you have done all of the cross sections.

Fill out the rest of the Cross section Spreadsheet to determine the total Volume of Cut and Fill

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