Survey Data

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Level Survey Reducing Levels

Level Survey terminology

(first) (many) (last)

Backsight Intermediate Foresight

Level Survey reading the staff

Each square interval = 10mm Each 'E' = 50mm

Level Survey

taking & recording sights

Position Tripod Located for clear views

Place Staff A clearly defined point with a preferably known level.

(temporary) Benchmark A.H.D. Australian height datum

Level Survey

taking & recording sights

1

st

Backsight

Staff Reading + known (given) level = B.S.

H.P.C

Level Survey

taking & recording sights

Intermediate Independent INT.

Level Survey

taking & recording sights

Foresight Last sighting made before relocating tripod F.S.

Level Survey

taking & recording sights

HPC Value changes only after tripod relocated H.P.C

Level Survey

taking & recording sights

Reduced Level 1st RL pre-determined. Subsequent values calculated by R.L. subtracting from HPC

Level Survey

taking & recording sights

Description Remember: Concise & accurate.

Description

Level Survey

taking & recording sights

Example

A temporary benchmark of 100.000 AHD is set [BS] Staff reading is 1.575m [HPC] = 100.000 + 1.575 = 101.575 BS 1.575

INT

FS

HPC

RL

Des.

101.575 100.000 Start TBM nail in footpath.

Level Survey

taking & recording sights

Example

A number of intermediate points are taken. [INT] 1.700 [INT] 1.300 BS

INT

1.575 1.700 1.300

FS

HPC

RL

Des.

101.575 100.000 Start TBM nail in footpath. Southwest corner of wall 101.575 99.875 101.575 100.275 Southeast corner of wall

This is showing a fall across the south elevation of the building of 400mm

Level Survey

taking & recording sights

Example

When closing the survey or prior to relocating the tripod a foresight is made BS 1.575

INT

FS

HPC

101.575 1.700 101.575 1.300 101.575 1.275 101.575

RL 100.000 99.875 100.275 100.300

Des. Start TBM nail in footpath. Southwest corner of wall Southeast corner of wall Legal point of discharge

Level Survey

taking & recording sights

Example

Calculating a new HPC HPC – [FS]-[BS] = new HPC 54.240- (5.260-3.640) = 52.620 1.620

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