Question NW2787 to the Minister of Transport

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19 September 2017 - NW2787

Profile picture: Matsepe, Mr CD

Matsepe, Mr CD to ask the Minister of Transport

Whether, with regard to the calverts that allow water from the Edenvale area to flow under the N3 highway in Gauteng, any assessment has been done since the flood in November 2016 to determine if their diameters are sufficient to allow water to flow freely under the highway without causing the water to dam up and flood the area; if not, why not; if so, (a) what are the findings of the assessment and (b) what (i) are the current diameters of the above calverts and (ii) should they be and (iii) would the cost be of increasing the calverts under the N3 highway?


During the late afternoon of 9 November 2016 flash flooding resulted in sections of the national road network in Gauteng being flooded. SANRAL initiated an investigation by a Specialist Engineering Company for the meteorological, hydrological and hydraulic assessment of the R24/N12, Linksfield and Gillooly’s interchanges to understand the underlying causes of the flooding. A final report was tabled on 12 September 2017 by the investigating Specialist.

The report reflects on the event of 9 November 2016 and explored reasons for the flooding which occurred at specifically three sites (see Figure 1):

  • R24/N12 interchange
  • Linksfield Road interchange
  • Gillooly’s Interchange