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Indiana LICA Contractor Certification Training Workshop

Basic Surveying Concepts. What you need to know to perform correct construction and checkout of NRCS practicesAbility to work with benchmarks that do not have elevations of 100.00Ability to work with both rod readings and elevationsAbility to use the slope equationAbility to establish your own benchmarks and turn pointsAbility to perform a bench level circuit.

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Indiana LICA Contractor Certification Training Workshop

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    1. Indiana LICA Contractor Certification Training Workshop 2008 Basic Surveying Concepts

    2. Basic Surveying Concepts What you need to know to perform correct construction and checkout of NRCS practices Ability to work with benchmarks that do not have elevations of 100.00 Ability to work with both rod readings and elevations Ability to use the slope equation Ability to establish your own benchmarks and turn points Ability to perform a bench level circuit

    3. Basic Surveying Concepts Benchmarks with elevations not 100.00 NRCS is using GPS survey grade equipment to survey more and more practices as we progress Survey Grade GPS will not be using an elevation of 100.00 for benchmarks most of the time The concept is the same regardless of the elevation of the benchmark

    4. Basic Surveying Concepts Waterway Scenario

    5. Basic Surveying Concepts With surveys based on benchmarks with Elevation of 100.00 1. You set up your laser (on zero grade!) and take a shot (Back Sight- BS) on the benchmark 2. You add that rod reading to 100.00 to get the height of the instrument (HI) 3. Then to obtain elevations you subtract your next rod readings (Fore Sights – FS) from the HI

    6. Basic Surveying Concepts When you use a benchmark of a different elevation, it’s the same process

    7. Basic Surveying Concepts Obtaining elevations from HI (HI – FS = Elevation) Ground shots and their elevations are rounded to tenths (0.X’) of a foot

    8. Basic Surveying Concepts Normally when you set up you can not see the entire project from that one set-up In these cases, you have to perform what is called a turn

    9. Basic Surveying Concepts Performing a turn requires: A solid Turn Point that will not move while surveying A Fore Sight on the Turn Point to determine its elevation from HI Move the instrument to a new location Take a Back Sight on the Turning Point to determine the new HI Continue surveying/ checkout

    10. Taking a FS Shot on the Turn Point (TP) Shots on “hard” objects can be recorded as hundredths (0.XX’) of a foot All Benchmark shots and turn points should be this way

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    15. Basic Surveying Concepts If you can’t see the original benchmark or the instrument is too high for you to shoot it, you’ll have to make another turn back to complete your checkout notes. This has to be done to verify the math of all your shots. This is also how you can check to see if our TBM’s are correct… in case you are having trouble with them.

    16. Basic Surveying Concepts When you begin with a benchmark and checkout your project and complete one or more turns and then turn back into the benchmark to check yourself, you have completed a bench level circuit. Your project checkout shots (waterway grade, bottom width, etc.) really aren’t part of the circuit as they don’t verify the shots taken on the benchmarks and turn points.

    17. Basic Surveying Concepts The Slope Equation Slope = Change in Elevation/ Change in Distance Example The elevation at station 11+00 is 564.3 and the elevation at 12+50 is 565.5 The change in elevation is (565.5 – 564.3 = 1.2’) The change in distance is (12+50 – 11+00 = 150’) Slope = 1.2’/150’ = 0.008 which is 0.8% This means that for every 100’ the constructed grade goes up or down 0.8’

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