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Bridge Foundation Scouring Scenario of New Zealand (Part-2)

We were on failure scenario of bridges due to hydraulic causes, scouring of foundation of bridge. We will discuss below rest two bridge failures:

c. Blackmount Road Bridge:

  • On Mararoa River
  • Road from clifden-manapouri

Failure date:

Considered failure between (25-26) august in 1980 

Foundation scouring of Blackmount Road Bridge
Causes of failure:

Scouring, undermining in a pier.

d. Waipaoa River Rail Bridge:

  • On Waipaoa River
  • On Palmerston north to Gisborne line

Failure date: between (7-8) march in 1988

Causes of failure:

  • One abutment outflanked and undermined
  • Three piers were affected under both general scour and local scour.

Construction of rail bridge on Waipaoa River
Regarding cost involvement, we can include an expenditure calculation, done by Department of Scientific and Industrial Research (DSIR). This report prepared by coleman and Melville in 2000. An annual expenditure of 36 million dollar (NZ) was involved to restore flood scours.

DSIR, New Zealand provided that 50% of its budget was required for restoration of bridges and maintenance of them as well. Of these 70% expenditure was concentrated to bridge scour. Besides these there have many indirect expenditure and long term impact on local economy.

Dear reader there have other bridge failure, all are not included here. In our next post we will learn about scouring of foundation of bridges in United States.

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