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A benchmark has been established at the soffit of an ornamental arch at the known elevation of 100.0 m above the sea level. The back sight used to establish height of instrument is an inverted staff reading of 2.105 m. A forward sight reading with a normally held staff of 1.105 m is taken on a recently constructed plinth. The elevation of the plinth (in m) is (Answer up to two decimal places)
Correct answer is '96.79'. Can you explain this answer?
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A benchmark has been established at the soffit of an ornamental arch ...
Given Information:
- Benchmark elevation: 100.0 m above sea level
- Backsight reading: 2.105 m (inverted staff reading)
- Foresight reading: 1.105 m (normal staff reading)
Objective:
To determine the elevation of the recently constructed plinth.
Explanation:
To find the elevation of the plinth, we need to use the principle of reciprocal leveling. Reciprocal leveling involves taking a backsight reading on a benchmark and a foresight reading on a point of unknown elevation. The difference between the backsight and foresight readings gives the difference in elevation between the benchmark and the point.
Step 1: Calculate Height of Instrument (HI)
The height of instrument (HI) is the sum of the benchmark elevation and the backsight reading.
HI = Benchmark elevation + Backsight reading
HI = 100.0 m + 2.105 m
HI = 102.105 m
Step 2: Calculate Reduced Level (RL) of the Plinth
The reduced level (RL) of the plinth can be calculated by subtracting the foresight reading from the height of instrument (HI).
RL = HI - Foresight reading
RL = 102.105 m - 1.105 m
RL = 101.00 m
Step 3: Calculate Elevation of the Plinth
The elevation of the plinth is the RL of the plinth minus the benchmark elevation.
Elevation = RL - Benchmark elevation
Elevation = 101.00 m - 100.0 m
Elevation = 1.00 m
However, the answer provided is '96.79', which suggests that there might be additional information or calculations involved that are not mentioned in the given question. Without any additional information, it is not possible to arrive at the given answer. Please provide more details or clarify the question if there are any missing elements.
- Benchmark elevation: 100.0 m above sea level
- Backsight reading: 2.105 m (inverted staff reading)
- Foresight reading: 1.105 m (normal staff reading)
Objective:
To determine the elevation of the recently constructed plinth.
Explanation:
To find the elevation of the plinth, we need to use the principle of reciprocal leveling. Reciprocal leveling involves taking a backsight reading on a benchmark and a foresight reading on a point of unknown elevation. The difference between the backsight and foresight readings gives the difference in elevation between the benchmark and the point.
Step 1: Calculate Height of Instrument (HI)
The height of instrument (HI) is the sum of the benchmark elevation and the backsight reading.
HI = Benchmark elevation + Backsight reading
HI = 100.0 m + 2.105 m
HI = 102.105 m
Step 2: Calculate Reduced Level (RL) of the Plinth
The reduced level (RL) of the plinth can be calculated by subtracting the foresight reading from the height of instrument (HI).
RL = HI - Foresight reading
RL = 102.105 m - 1.105 m
RL = 101.00 m
Step 3: Calculate Elevation of the Plinth
The elevation of the plinth is the RL of the plinth minus the benchmark elevation.
Elevation = RL - Benchmark elevation
Elevation = 101.00 m - 100.0 m
Elevation = 1.00 m
However, the answer provided is '96.79', which suggests that there might be additional information or calculations involved that are not mentioned in the given question. Without any additional information, it is not possible to arrive at the given answer. Please provide more details or clarify the question if there are any missing elements.
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Community Answer
A benchmark has been established at the soffit of an ornamental arch ...
RL of Plinth = 100.000 - B.S - F.S
= 100.000 - 2.105 - 1.105 = 96.79 m
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A benchmark has been established at the soffit of an ornamental arch at the known elevation of 100.0 m above the sea level. The back sight used to establish height of instrument is an inverted staff reading of 2.105 m. A forward sight reading with a normally held staff of 1.105 m is taken on a recently constructed plinth. The elevation of the plinth (in m) is (Answer up to two decimal places)Correct answer is '96.79'. Can you explain this answer?
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A benchmark has been established at the soffit of an ornamental arch at the known elevation of 100.0 m above the sea level. The back sight used to establish height of instrument is an inverted staff reading of 2.105 m. A forward sight reading with a normally held staff of 1.105 m is taken on a recently constructed plinth. The elevation of the plinth (in m) is (Answer up to two decimal places)Correct answer is '96.79'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about A benchmark has been established at the soffit of an ornamental arch at the known elevation of 100.0 m above the sea level. The back sight used to establish height of instrument is an inverted staff reading of 2.105 m. A forward sight reading with a normally held staff of 1.105 m is taken on a recently constructed plinth. The elevation of the plinth (in m) is (Answer up to two decimal places)Correct answer is '96.79'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A benchmark has been established at the soffit of an ornamental arch at the known elevation of 100.0 m above the sea level. The back sight used to establish height of instrument is an inverted staff reading of 2.105 m. A forward sight reading with a normally held staff of 1.105 m is taken on a recently constructed plinth. The elevation of the plinth (in m) is (Answer up to two decimal places)Correct answer is '96.79'. Can you explain this answer?.
A benchmark has been established at the soffit of an ornamental arch at the known elevation of 100.0 m above the sea level. The back sight used to establish height of instrument is an inverted staff reading of 2.105 m. A forward sight reading with a normally held staff of 1.105 m is taken on a recently constructed plinth. The elevation of the plinth (in m) is (Answer up to two decimal places)Correct answer is '96.79'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about A benchmark has been established at the soffit of an ornamental arch at the known elevation of 100.0 m above the sea level. The back sight used to establish height of instrument is an inverted staff reading of 2.105 m. A forward sight reading with a normally held staff of 1.105 m is taken on a recently constructed plinth. The elevation of the plinth (in m) is (Answer up to two decimal places)Correct answer is '96.79'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A benchmark has been established at the soffit of an ornamental arch at the known elevation of 100.0 m above the sea level. The back sight used to establish height of instrument is an inverted staff reading of 2.105 m. A forward sight reading with a normally held staff of 1.105 m is taken on a recently constructed plinth. The elevation of the plinth (in m) is (Answer up to two decimal places)Correct answer is '96.79'. Can you explain this answer?.
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