The purpose of a Topographical Survey is to collect survey data of natural and man-made features of the land and its elevations. From the survey, a topographical drawing is generated and this captures a detailed and accurate mapping of the site context.
Typical features recorded in the topographical mapping are:
- plot boundary
- building outlines / roof eaves (not interiors)
- drains
- driveways
- inspection chambers (these have to be visible/accessible)
- sewer manholes (these have to be visible/accessible)
- location of trees
- boundary walls / fences
- spot levels
- any other visible features on the ground (eg: garden steps)
In the event that the inspection chambers and/or sewer manholes are not readily accessible, the surveyor will also help incorporate the SIP / DIP / RLP / RRP info into the topographical drawing. Refer to this article for more info on these matters.
This is vital information needed by architects and engineers for all stages of work - the design development, authorities submissions, and construction work. This includes, and is not limited to, how we determine the minimum platform level and floor levels of the house, plan the water drainage flows and discharge point, widen the driveway, plan for external works, and strategically locate sewerage inspection chambers etc.
You should always engage a registered surveyor for these works. Topographical survey works typically take between 3 - 4 weeks to complete. Topographical surveys provide practical and precise information that can reveal any potential issues and reduce the risk of costly mistakes downstream and is essential to kick start the process of designing your dream house.
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