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Estuaries in NSW

Dee Why Lagoon

Tidal and Mangrove Limits

This pages show a summary of Tidal and Mangrove Limits for this estuary that has been collected under the Estuary Management Program, in conjunction with Manly Hydraulics Laboratory.

Methodology - Short Description

A full description of the reasoning and methodology of obtaining this data is available in the original report by Manly Hydraulics Laboratory MHL-Report 1286. A shortened version without the extensive tables of limits is available here (This file is 3.6Mbytes in size).

The Tidal Limit is defined as the maximum upstream location that a tidal variation in water level is observed. Using water level recorders, this point was determined for predicted ocean tide high water greater then 1.8m ISLW and no significant fresh water inflow into the estuary. Only waterways with a tidal extent greater then 2km were surveyed.

The Mangrove Limit was defined and surveyed as the most upstream location of a growing mangrove.

Explanation of Table Entries

Branch - Branch or tributary name
Limit - Tidal or mangrove limit
Date - Date or period that data was collected
Map - Map name of the 1:25000 NSW topographic map
Location - Map MGA coordinate of "Easting Northing (Zone)" in metres
Distance - Distance in kilometres upstream of estuary entrance
Comment - Description of the location or why there is no limit

Branch	Limit	Date	Map	Location	Distance
		Comment
Dee Why Lagoon	Tidal	05/05/00	Mona Vale
		Fully tidal lagoon when entrance is open

	Mangrove	06/10/00	Mona Vale
		Entrance usually closed - no mangroves

(Dee Why) Creek	Tidal	05/05/00	Mona Vale	341663E 6264720N (56)	1.4
		Entrance often closed but when open, tide reaches this point in concrete drain, 100m upstream from Pittwater Road

	Mangrove	06/10/00	Mona Vale
		Entrance usually closed - no mangroves