Inclination Surveys
- Steve Peregrine
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Chapters
Inclination Surveys
At the time of writing this, there is an increasing requirement from the client to carry out inclination tests on pipes while doing CCTV inspections. As a contractor, you should be clear on your requirement to do this and price your works accordingly.
We already have a manual explaining how to create WinCan VX inclination reports and best practices on site which is outside of this manual and can be found by clicking here. Like this HADDMS user guide, the inclination manual also has several chapters.
Contractors undertaking inclination works should understand from the manual:
The need for equipment to be calibrated and certified.
The training requirements for staff on site carrying out the works.
How to get the best possible results from the hardware and the software.
The possible pitfalls that can be experienced when carrying out inclination tests.
Inclination Data for HADDMS
The areas may request any number of outputs and data reports including pdf charts and/or data files, but the requirement purely for HADDMS is quite simple. There are 4 virtual observation codes which the operator does not enter in WinCan VX and are simply added to the observation.dbf file at the point of creating the final export shapefiles where an inclination test exists in the data for an asset.
These are akin to codes like BLOS, CLEAN and SOUND which are also virtual codes that added automatically by the export routines in WinCan VX based on given rules and cannot be added by the user. The virtual codes for HADDMS are:
GRMAX - the maximum point gradient in % recorded during the test.
GRMIN - the minimum point gradient in % recorded during the test.
GRAVE - the average gradient in % recorded during the test (the overall grade of the asset).
GRDEF - the maximum deviation up or down from the ‘perfect line’ of sight in mm between the upstream end of the pipe and the downstream end of the pipe based on their recorded invert levels above sea level.
It is standard practice in WinCan VX and also in HADDMS that all inclination test results are normalised into a downstream direction, so regardless of the direction of the test, the output graphs will always be given downstream to avoid confusion. A ‘good’ chart will always go from top-left to bottom-right which is intuitive when looking at the page.