HISTORY ON COLLAROY BEACH (point A)
http://gse.mq.edu.au/docs/gse811/CaseStudy_CNCoastlineHazardLines.pdf





- Long history of storm damage and coastal erosion
- Most highly capitalised beachfront on NSW
- Nationally- 3rd area most at risk from coastal processes
- Storms that caused considerable damage 1920's, 40's 60's 70's 
- The problemstemsfromthe fact thattheinitial sub-division wastooclosetothe beachwith propertiesextendingintothe active beach zone.” (Nielsen Lord Associ ates,1988).
- Early actions to minimise property damage

• Building lines were established follow ing severe storms in 1967 and 1974:
- 15m setback north of Goodwin St
- 23m setback south of Goodw in St to Jenkins St 
- Collaroy/Narrabeen Coastline Management Plan (1997)

Adopted in 1997
Identif ies management strategies f or dealing with coastal erosion along the beach. 

Management Strategies include:

• Undertake protective
works
• Environmental planning measures
• Development control and conditions
   Dune management 

DAY 2	Water Point A	Water Point B	Soil Point A	Soil Point B
pH	8.1	7.8	6.8	7.0
Salt (digital)	20 000 ppm	20 000 ppm	1600ppm	1190ppm
Salt (Silver Nitrate) Visual	Real White	Same just a tiny bit less	Not to cloudy	Not to cloudy
MOISTURE SOIL ONLY (OVEN)	N/A	N/A	Before – 45.22g After – 43.85g = 1.37g	Before – 54.50g After – 53.00g = 1.50g
Turbidity (Water)	0.00	5.9	N/A	N/A
Phosphate (water)	25	25-50 (real close to 25)	N/A	N/A
Texture & Colour (Soil)	N/A	N/A	Real lumpy, and cloggy	Same  as before just a bit more softer
Possible Parent Rock(s) (soil)	N/A	N/A	Sandstone	Sandstone
Pollution (water)	None- although sea weed	A lot of sea weed, and pollution (rubbish, and old clothing materials)	N/A	N/A

RESULTS

DAY 1

	Water Point A	Water Point B	Soil Point A	Soil Point B
pH	8.3	8.1	6.7	6.9
Salt (digital)	20 000 ppm	20 000 ppm	1680 ppm	1205 ppm
Salt (Silver Nitrate) Visual	Real White Cloudy	Still Really White but not as much	More Cloudier then B, Cloudy but not incredibly white.	Less Cloudier then A
MOISTURE SOIL ONLY (OVEN)			Before – 52.40g After – 50.70g = 1.7	Before – 55.70g After- 54.25g = 1.45g
Turbidity (Water)	0.00	5.05	N/A	N/A
Phosphate (water)	25	10 – 25 (closer to 10)	N/A	N/A
Texture & Colour (Soil)	N/A	N/A	Grey black (more black) thin and Hard	<  <  <
Possible Parent Rock(s) (soil)	N/A	N/A	Sandstone	<  <  <
Pollution (water)	Sea weed no pollution	A lot of sea weed no pollution	N/A	N/A