Narellan Creek Overland Flood Study (Vol 1) - Flipbook - Page 21
Narellan Creek Catchment
Flood Study
Gauge
Number
Gauge Name
Gauge
Type
Source*
Start of
Records
End of
Records
Distance from
centroid of
catchment (km)
68122
Cawdor (Woodburn)
Daily
BOM
(AUS)
29/11/1962
68141
Cawdor
Daily
BOM
(AUS)
01/01/1896
1/01/1925
8.54
567228
Tbrg at Syd.Water Res'VoirFlynn Reserve-Bradbury
Sub-daily
DNR
(NSW)
8/04/1983
7/04/1993
8.7
67107
Varroville (St James Rd)
Daily
BOM
(AUS)
29/11/1992
30/10/1998
8.86
568149
Camden (Brownlow Hill)
Sub-daily
SW
1/08/1985
68043
Minto Surrey Street
Daily
BOM
(AUS)
29/09/1889
1/01/1990
9.34
68220
Minto (Alderney Street)
Daily
BOM
(AUS)
30/03/1984
24/01/1996
9.35
67063
Cuthill
Daily
BOM
(AUS)
1/01/1965
1/01/1973
9.89
68231
Ruse (Denison St)
Daily
BOM
(AUS)
29/04/1992
8.54
9.14
9.91
NOTE: * BOM = Bureau of Meteorology, SW = Sydney Water, SCA = Sydney Catchment Authority, WNSW = Water NSW
The information provided in Table 1 indicates that daily rainfall records in the vicinity of the
study area are available dating back to the 1890s. However, sub-daily rainfall records are
only available from 1987 onwards. However, this is sufficient to capture the potential
calibration floods, as discussed below.
2.3.2
Historic Flood Marks
Camden Council commissioned the survey of peak flood levels after several large floods in
the local government area. The available flood mark data are summarised in Table 2 and
the location of each flood mark is shown in Figure 2.
Table 2
Available Flood Marks
Number of Flood Marks
Flood Date
Overall
Within Catchment
June 2016
47
20
February 2020
53
8
March 2022
30
14
July 2022
17
10
As shown in Table 2, flood mark information was provided for four historic floods. It also
shows that at least eight flood marks are available each of the floods. The June 2016 flood
has the most flood marks available following by March 2022 and July 2022.
As noted by Public Works Advisory (2017), the survey of flood marks was completed using
Real Time Kinematic (RTK) GPS point height measurements which, while generally
dependable, have limitations in terms of both horizontal and vertical accuracy, and are
7
