Aquaculture Engineering (2+1)

Chain surveying - Off-sets - Surveying steps

Unit 1- Surveying

Chain surveying

Off-sets

Survey may be done in the following steps.

• Reconnaissance
• Marking and fixing survey station
• Running a survey lines

Reconnaissance

Before starting the actual survey measurements, the surveyor should walk around the area to fix best positions of survey lines and survey stations. During reconnaissance a reference sketch of the ground should be prepared.

Marking and fixing survey stations
After selected the survey stations, they should be marked to enable them to be easily discovered during the progress of the survey.

Running survey lines
After having completed the preliminary work, the chaining may be started from the base line. The work in running a survey line is two fold.

• to chain the line
• to locate the adjacent details