Mangawhai-pakiri

Question 1

What is sand used for

Answer 1

Construction,glass manufacturers,beach replenishment

Question 2

Where is the Mangawhai- pakiri coastline

Answer 2

East coast of new Zealand s north peninsula in Auckland

Question 3

What is ten sand from Mangawhai- Pakiri used for

Answer 3

Construction

Question 4

What is the population of Auckland

Answer 4

1.5 million 1/3 NZ population

Question 5

How much GDP does Auckland count for

Answer 5

35 percent

Question 6

How many people visited Auckland in 2015

Answer 6

2.3 million foreign visitors

Question 7

How long is ten Mangawhai-pakiri coastline

Answer 7

20km

Question 8

How long has dredging on the coastline gone on for

Answer 8

70 years

Question 9

How much sand has been extracted between 1994 and 2004

Answer 9

165,000 m^3

Question 10

When did mining stop at Mangawhai beach

Answer 10

2005

Question 11

How much sand was extracted at Pakiri beach

Answer 11

75,000 m ^ 3

Question 12

When did mining stop on Pakiri beach

Answer 12

2020

Question 13

What is some of the sand used for

Answer 13

Replenishing Auckland’s tourist beaches

Question 14

Do rivers provide any sediment

Answer 14

No there are very few rivers

Question 15

What type of system is Mangawhai-Pakiri (open or closed)

Answer 15

Closed as there are no rivers adding sediment

Question 16

How much do extraction rates exceed deposition by

Answer 16

5x

Question 17

How are coastal land forms affected

Answer 17

Beaches are wider and flatter don’t absorb energy as well. More susceptible to wind erosion as the vegetation goes

Question 18

What happened in 1978

Answer 18

28 metre breach at the base of the Mangawhai beach led to sedimentation of the harbour (shallower water) more risk of flooding

Question 19

By the end of the century how much will the coast retreat by

Answer 19

100 metres