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Mangawhai-Pakiri Case study

Case study information for the Economic development case study: Mangawhai-Pakiri for OCR A-Level geography topic Costal Landscapes
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Last updated: May 7, 2026
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First submittedMay 7, 2026
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Answer
What is a use of the the mined sand?
construction | concrete making | glass manufacturing | beach replenishment
How many km north of Auckland is the coastline?
50
What is the population of Auckland in millions?
1.5
What % of New Zealand's population live in Auckland?
33
What % of New Zealand's GDP is Auckland accountable for?
35
How many millions of tourists visited Auckland's costal regions as of 2015?
2.3
How many years has there been nearshore dredging between Mangawhai and Pakiri?
70
What year did mining end in Mangawhai but continued at Pakiri?
2005
What is the current rate of extraction of sand in m*3/year from (2005-2020)?
75,000
What is the previous rate of extraction of sand in m*3/year (1994-2004)?
165,000
Is sand a renewable or non-renewable source?
Non-renewable
What period was the sand deposited along the coastline?
Holocene
How many years ago was this period?
9000
What is happening to beaches starved of sediment?
Wider and Flatter
What landforms are becoming more vulnerable?
Dunes and Spits
What year did a storm cause a breach at Mangawhai spit?
1978
What was the size of this breach in m?
28
What had altered currents led to in Mangawhai’s harbour
Sedimentation
What is the length in m of estimated long-term coastal retreat by the end of the century?
35
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