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Chapter 2 Location Survey

Chapter 2 Location Survey. Location Survey.

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Chapter 2 Location Survey

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  1. Chapter 2 Location Survey

  2. Location Survey Runs the control points of the centerline of the project. Places BMs every 1000’ +/- throughout project for Vertical Control. Locates and runs elevations and off-sets on existing utilities and drainage structures. This is just an Idea of what Survey work goes into the Final Plans.

  3. Begin Construction POT PC POC PT PI RP End Construction Horizontal Control

  4. BM No. 03254 Concrete Monument w/Brass Disc. 111’ Rt. Sta. 929+72 Elev. 71.97

  5. Vertical Control

  6. BENCH LEVELS General: Surveys for the Department must conform to the accuracy required by the Board of Professional Surveyors and Mappers rule chapter 61G17-6.003. In order to consistently obtain the required accuracy exacting equipment and methods must be used.

  7. BENCH LEVELS It has been said that a road is built with a level. The bench line is the vertical control for all subsequent work, both for Location and Construction, on the project. For this reason no other facet of a Location Survey is more important.

  8. BENCH LEVELS Definitions: • LEVELING: Operation used for obtaining the measurement of difference in elevation.

  9. BENCH LEVELS • DIFFERENCE IN ELEVATION: Vertical distance between two points. Definitions:

  10. BENCH LEVELS Definitions: • BACKSIGHT: Sight taken with the level to point of known elevation (often called a plus (+) ).

  11. BENCH LEVELS Definitions: • FORESIGHT: Sight taken with level to a point, elevation of which is to be determined (often called a minus (-) ).

  12. BENCH LEVELS Definitions: • HEIGHT OF INSTRUMENT (HI) : The sum of the known elevation at the point of backsight and the reading taken on the backsight.

  13. BENCH LEVELS Definitions: • TURNING POINT: Solid fixed point used temporarily in leveling where rod is held first for foresight, then for backsight.

  14. BENCH LEVELS Definitions: • BENCH MARK: Fixed solid reference point or object. Permanent as possible in character.

  15. FLA. DEPT. OF TRANSPORTATION B M SURVEY MARKER PLEASE DO NOT DISTURB

  16. FDOT

  17. Level Rods

  18. Level Rods Exercise 1 Reading 1 Reading 2

  19. Level Rods Exercise 2 Reading 1 Reading 2

  20. ANY QUESTIONS ?

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