Chapter 3 is worth 15 points 5 points per problem plus 5 points for the field notes problem 3. However, each person in the group must make a sketch in hishers field book during the leveling procedure. Field note bs, is, fs on separate columnsrod reading on soft ground closest 0. Review questions asm 63 test one 2003 university of missouri. Always start at a bm bench mark point of known elevation 3. In this article, i will discuss pertinent terminology, the equipment used for differential leveling, and threewire leveling. Differential leveling computation of elevations group problem 1 differential leveling computation of elevations group problem 2 elevation 110. Performing a closedcircuit differential leveling 1. Differential leveling cornell university college of. In differential leveling you subtract the height of the instrument from the to get the elevation. Reduce the set of differential leveling notes in table, and. Measure angle twice at direct and reversed position.
Differential levelling this method is used to find the difference in the elevation between points if they are too far apart or the difference in elevation between them is too. Many different types of surveys can be used depending on the desired results. Determining or establishing elevations is, at times, the most essential activity of the field engineer. What are the rod readings at the horizontal lines in figure 30. Note down all your measurements in a field book, using a table similar to the ones you have used with other methods. Auto level leveling rod eye protection blank set of field notes leveling rod target gloves builders level operators manuals for leveling instruments hard hat calculator permanent markers steeltoe boots. The most common methods to determine elevation are through the use of 1 a compensator type. A field measurement may itself require transformation called reduction before it can be applied as a value in computations. Differential leveling the level a level consist of a highpowered telescope the level is attached to a spirit or bubble level that keeps the line of sight of the telescope horizontal differential. Engineering aid 3 beginning structural engineering guide book page navigation. Calculate and determine which order of differentia. Complete the benchmarkleveling field notes shown in figure 32 by computing and recording. Figure 1414 shows a sample differential leveling run. Ordinary differential leveling determining or establishing elevations is, at times, the most essential activity of the field engineer.
A farmer buys a field that is 2 miles in length and. Differential leveling equipment and materials personal protective equipment. Fudged notes, erasures, scratch outs, and missing pages in the field book all. Differential leveling is the process of measuring vertical distances from a. To determine the elevation of points relative to a reference point by differential leveling ii. Be able to understand the terms used in differential and profile leveling 3. Auto level leveling rod eye protection blank set of. In differential leveling field notes what do these abbreviations stand for. Ce 301 civil engineering systems differential leveling 5 page 1 of 2 10162014 introduction. Spring 2016 field book university of colorado boulder.
One crew member shall be responsible for taking notes in the field book. Differential leveling involves measuring vertical distances from a known elevation. Chapter 10 differential leveling survey specifications. For differential leveling, the only critical feature of station identification is that an organized method be used so that the system is clear to the user of the notes. Just about everything located on the project requires elevation. The field notes rod readings and descriptions and calculated elevations w on the provided blank field book sheet similar to the example provided. A vertical position is the height of a point relative to. This is a very basic example of filling out the field notes from. Readings and computations are recorded on the left plate of the field book page and support information on the right, figure c1. Materials checklist for module 2740114, site layout one. Table of data, for differential leveling or profile leveling, taping or traverse data, etc. The chap down on one knee is noting in a field book the height measurement called out by the telescope operator.
Standard note keeping procedures have been developed to simplify and systematize record keeping for leveling. Field notes can be recorded by hand in a bound field book, or on the departments forms. In most cases, we the earths sea level as our reference point, but in some cases the ground level is used as the reference point. Assignment 4 solutions assignment 4 solutions 1 what are. School of architecture, building and design bachelor of quantity surveying honours qsb18 site surveying field. One set of measured data to be recorded for each group in one of the field books during the leveling procedure. Surveyors use this technique to determine point elevations, crosssections, and control benchmarks. Working on field notes for differential leveling the basics. This is a very basic example of filling out the field notes from a paper. Chapter 10 differential leveling survey specifications 1001 general survey specifications describe the methods and procedures needed to attain a desired.
Civl 1101 surveying introduction to differential leveling1 7. Differential leveling lab 5 ce 301 civil engineering. Engineering field handbook chapter 1 surveying preface this manual is a revision of the engineering survey chapter of the 1969 soil conservation services engineering field manual. Answer to reduce the set of differential leveling notes in table, and perform the arithmetic check.
Refers to those control, topographic, and construction surveys necessary for the location and construction of highways, railroads. The first few pages of your field notes book are called the. Elevation refers to the height above or below a fixed geographic reference point. Double rodding double rodding is a form of differential leveling in which a continuous check is maintained on the accuracy of the leveling procedure. Collimation error earth curvature refraction above errors are systematic, and are essentially removed by balancing sight. During this lab you will learn how to compute and adjust the elevation of unknown points knowing the elevation of one vertical control point bench mark. Be able to record a set of notes for differential and profile leveling. To find the elevations at a given point, we use a process called differential leveling, whereby we. Differential leveling is the other basic survey skill needed in conservation engineering.
Field notes can be recorded by hand in a bound field book, or on the departments forms hcs88 or dhsp14. Types of leveling methods in surveying the constructor. Leveling is the process of determining the elevation of points on, above or below the surface of the earth. Differential leveling is the process of measuring vertical distances from a known elevation point to determine elevations of unknown points. One set of measured data to be recorded for each group in. Surveying notes must be recorded legibly and accurately in a field book as the work is done. Elevations are needed to set slope stakes, grade stakes, footings, anchor bolts, slabs, decks, sidewalks, curbs, etc. This is a very basic example of filling out the field notes from a paper example that could be used prior to actually using the equipment. This is a very basic example of filling out the field notes from a paper example that could be used. Using a laser level, perform a closedcircuit differential leveling of xxx. Although at first glance differential leveling notes may appear a little complicated, they are relatively simple and reflect the leveling process.