Validation Surveys

Purpose of survey

To verify whether the inventory information held on the drainage data management system (DDMS), previously derived from drawings, is a true record of the visible surface point assets.

What is a validation survey?

  • A quick walkover survey
  • Used to assess drainage data that has been derived from drawings, not previous field surveys
  • Carried out in the daytime

Survey data round tripping

The drainage inventory information on the DDMS in the catchments to be surveyed will be round-tripped in accordance with the specific procedures and formats.


A survey report will be created of the submission of the round-tripped DDMS survey data, including any original un-changed data and all the digital photographs taken during the survey

All of our surveys are compliant to National Highways documents CS551 and CD535.


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