SURCON QUESTION: YOU HAVE BEEN REQUESTED TO UNDERTAKE
THE PERIMETER AND TOPOGRAPHICAL SURVEY OF AN AREA OF LAND OF APPROXIMATELY
5,000 HECTARES IN A FAIRLY HILLY AND FORESTED AREA. THE NEAREST CONTROL POINTS
ARE 40KM FROM THE SITE. PREPARE A PROPOSAL FOR YOUR CLIENT, WHICH MUST INCLUDE
THE OVERALL COST OF THE PROJECT.
The project shall comprise the
following survey procedures:
1.
Reconnaissance
survey
2.
Control
extension
3.
Monumentation
4.
Perimeter
5.
Topographical
survey
6.
Office
work
Each of these procedures shall be
described and cost of carrying them out outlined.
Reconnaissance Survey
Reconnaissance survey is the
preliminary survey of the project area. It involves sighting the extent and
marking turning points along the perimeter. Reconnaissance also involves
locating available government control points. During reconnaissance, suitable
and intervisible locations, at which survey points can be established, will be
determined and marked in the ground. The reconnaissance survey shall be carried
out by a team of one surveyor, three technical officers, one assistant surveyor
and six labour crew. They shall be supported by transportation and basic
equipment. The survey shall last for five days.
Direct cost for the reconnaissance
survey:
1 senior surveyor N10,500.00 per day
1 Assistant surveyor N5,500.00 per day
3 Technical officers N16,500.00 per day
6 Labour crew (line clearing) N18,000.00 per day
Transportation N25,000.00 per day
Basic equipment N15500.00 per day
Total N80,000.00
per day
Total for five days N400,000.00
Control Extension and Densification Survey
Control extension shall be done in
two phases:
1.
Establishment
of second-order controls. Four second-order controls points shall be
established at strategic locations within the border of the project area.
2.
Establishment
of third-order controls. Afterwards, using the second-order controls points,
third-order controls shall be established all over the project area.
Global Positioning System (GPS) shall
be employed to carry out the control extension. The third-order controls shall
be established approximately 500m apart. As such about 200 such controls will
be needed within the project area.
Equipped with two double-frequency
and three single-frequency GPS receivers, the survey team shall spend two weeks
on the field.
Direct cost for the control survey
shall be as follows:
1 Senior surveyor N10,500.00 per day
2 Assistant surveyors N11,000.00 per day
4 Technical officers N22,000.00 per day
4 Labour crew N12,000.00 per day
Transportation N25,000.00 per day
Basic equipment N50,000.00 per day
Total N125,000.00
per day
Total for two weeks N1,750,000.00
Monumentation
The turning points marked on the
ground during reconnaissance survey shall be beaconed according to SURCON
specifications. The beacons shall be allowed to settle for two days before
survey shall be carried out on them. From the reconnaissance survey, a total of
148 turning points have been identified. It shall take about ten days to
complete casting the beacons.
Direct cost for monumentation
Cost of 118 standard cadastral
beacons @ N1,000 N118,000.00
1 Assistant Technical Officer N3, 500.00
per day
4 Labour crew N12, 000.00
per day
Transportation N25,000.00
per day
Basic tools N5,000.00
per day
Total N45,500.00
per day
Total for 10 days N455,000.00
Perimeter Survey (GPS Relative Positioning)
GPS Relative Positioning method shall
be used to carry out the perimeter survey. This method is faster and the 118
corners can be established in 6 days, instead of the traditional traversing
which can take weeks.
Cost of GPS relative positioning
survey
1 Senior surveyor N10,500.00 per day
2 Assistant Surveyors N11,000.00 per day
4 Technical officers N22,000.00 per day
4 Labour crew N12,000.00 per day
Equipment N50,000.00 per day
Transportation N25,000.00 per day
Total N130,500.00 per day
Total for 6 days N810,000 .00
Topographic Survey
Topographic survey shall be carried
out at 10m grid; that is, horizontal and vertical position of points at 10m
intervals throughout the project area. This shall be achieved using GPS
kinematic method.
Cost of Topographic survey
1 hectare (10m grid) N250,000.00
50 hectare (10m grid) N7,500,000.00
5000 hectare (10m grid) N75,000,000.00
Office Work
The project shall begin with office
work and end with more office work. The initial office work shall include
acquisition of available government control points and topographic maps. With
existing maps we familiarize with the project area before going to the field.
After field work, the office work shall include data processing, plotting and
technical writing.
Cost of Office work:
Data processing N50,500.00
Plotting N105,000.00
Technical report N50,500.00
Total N206,000.00
Total cost of project N78,621,000.00
Mobilization/demobilization, 5% of total cost = N3,931,050.00
Contingencies,
5% of total cost = N3,931,050.00
Grand total N864,831,100.00
DISCLAIMER: This material
is only an attempt to answer an examination question, though written from a
background of solid knowledge and practical experience in Surveying and
Geoinformatics. It has not gone through peer review. Therefore, all views and
opinions expressed therein remain the responsibility of the author and do not
necessarily represent that of any institution. Feedback on corrections
and constructive criticisms are welcome. Thank you.
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