KAMILARIO HWY (SH 29)

192

.67

192

.84

192

.99

193

.25

193

.47

193

.64 1

93.7

6

193

.82

193

.81

194.09

194

.05

194.01

194.04

193.75

193.82

193.80

193.59

193.65

193.47

193.33

193.25

193.17

193.04 193.13

193.10

193.09

192.86 192.62

192.44

192.48

192.23

192.32

192.38

192.45

192.44

192

.29

192.55

192.48

192

.65 1

92.6

5 192

.79 1

92.8

3

192.87

192

.89

193

.00

BOOLCARROL ROAD (SH29 KAMILAROI HWY)

ROSE STREET (SH29 KAMILAROI HWY)

CULGOORA ROAD (MR127)

VERA LEAP ROAD (SR247)

VERA LEAP ROAD (SR247)

TRUCKING YARD LANE

VERA L

EAP

ROAD (SR24

7)

MYA

LLA

LA

NE

(SR

211)

CHARLES STREET

BOUNDARY STREET

LAGOONBRIDGE

BM-NSC2

WEE WAA

LAGOON

TO BURREN JUNCTION

TO NARRABRI

TOWNOF

WEE WAA

N

ALMA STREET

WEE WAAHIGH

SCHOOL

CHARLES STREET (MR127)

WARRIO

R STREET

SHORT

STREET

TRUCKING YARD LANE

BM-NSC2

CH100

CH200

CH300

CH400

CH500

CH600

CH700

CH800

CH900

CH1000

CH1100

CH

1200

CH

1300

CH

1400

CH

1500

CH

1600

CH1700

CH1800

CH1900

CH2000

CH2100

CH2300

CH2400

CH2500

CH2600

CH2700

CH2800

CH2900

CH

3000

CH

3100

CH

3200

CH

3300

CH

3400

CH35

00

CH36

00

CH

5200

CH

5300CH

5400CH

5500

CH

5700CH

5800CH

5900

CH

6000

CH

6100

CH

6200

CH

6300

CH6600

CH6700

CH

6800

CH

6900

CH7000

CH7100

CH

7300

CH

7400

CH

7500

CH

7600

CH

7700

CH7800

CH7900

CH8000

CH8100

CH8200

CH8300

CH8400

CH8500

CH0(8585)

CH44

00

CH43

00

CH2205.965(CL RD)

CH4479.517(CL RD)

CH7037.600(CL RD) CH

3700

CH

3800

CH

3900

CH40

00

CH41

00

CH42

00

CH4600

CH4700

CH48

00

CH

4900

CH

5000

A

1018196

1018196

WWL-067-01Top of Levee Bank Survey by NSC on 10-11-2010

SITE LOCATION PLAN

1 1

AHD

G.P.LATHAM

G.P.LATHAM

G.P.LATHAM

NOT TO SCALE

A 22-11-2010 ISSUED FOR COMMENT GPL

BM-NSC2 (STAR STAKE)E736675.861N6654239.760RL=192.122 (BASE DATUM USED = PM6722)BM Location: N.E. END OF ALMA STREET, WEE WAA.

GLENCOE CHANNEL Location:E739213.918N6655589.707RL=194.205 (TOP CENTRE HW BOX CULVERT-RIVER SIDE)RL=194.444 (CL ROAD AT CHANNEL)

LEVEE BANK

STATION

CHAINAGE

LEGEND

CH2600

Owner:WESTERN CONTRACTORS &

GRAIN PTY. LTD.

Owner:MYALL VALE

PASTORAL COPTY. LTD.

GLENCOECHANNEL

VERA LEAPCAUSEWAY

BM-NSC3 (STAR STAKE)E734003.338N6653095.409RL=189.526 (BASE DATUM USED = PM6722)BM Location: VERA LEAP ROAD CROSSING ATLEVEE BANK, WEE WAA.

VERA LEAP CAUSEWAY Location:E734010.567N6653051.289RL=188.515 (CL ROAD AT CONCRETE CAUSEWAY BM-NSC2 (STAR STAKE)

E735028.091N6653313.437RL=190.775 (BASE DATUM USED = PM67622)BM Location: CRN. SHORT & CHURCH STREET,WEE WAA.

VERA LEAP CAUSEWAY Location:E734010.567N6653051.289RL=187.634 (DOWN STREAM CULVERT INVERT)RL=188.516 (CL ROAD AT CONCRETE CAUSEWAY)

Wee Waa Levee Flood Investigation

43207388/NWC-WAT-RPT/F3

C

Appendix C Mike 11 model

The “Narrabri – Wee Waa Flood Study” verified the Mike 11 model by plotting the observed flood

levels at Gunidgera against Mike 11 modelled flood levels as shown in Figure Appendix C-1 (Appendix

G of the Narrabri – Wee Waa Flood Study).

Figure Appendix C-1 Narrabri – Wee Waa flood study verification results

URS tried to replicate Figure Appendix C-1 to verify the Mike 11 model received from Council was the

same as the one used for the “Narrabri – Wee Waa Flood Study”. This was done to ensure the

hydrographs that were extracted from Mike 11 and used as the TUFLOW inflow hydrographs are

accurate. However when the Mike 11 model received from Council was run, URS could not replicate

the results shown in Figure Appendix C-1 (taken from Appendix G of the “Narrabri – Wee Waa Flood

Study”). The cross section reportedly used to extract the Mike 11 results used in the Flood Study

report was not present in the received model. Therefore two MIKE 11 chainages were picked to

represent Gunidgera; chainage 33006 which is closest to that used in the Flood Study; and 31512

which was used because it appears to be located in close proximity to the Gunidgera flood gauge.

184

185

186

187

188

189

190

191

192

18-Jul 23-Jul 28-Jul 2-Aug 7-Aug 12-Aug 17-Aug

Wate

r L

evel (A

HD

)

Date

Gunidgera Gauging Station (419059) - 1998 Hydrograph

Observed

Simulated

Wee Waa Levee Flood Investigation

Appendix C - Mike 11 model

43207388/NWC-WAT-RPT/F3

Figure Appendix C-2 Narrabri – Wee Waa flood study verification results compared to Mike 11 URS and TUFLOW results.

As shown in Figure Appendix C-2 cross section 31512 results show the best correlation to the

observed and TUFLOW modelled flood levels, however it over-estimates them both by approximately

0.3m. This is considered a sufficient match for the data to be used for comparisons in this study.

Given that the results from the flood study could not be replicated using the Mike 11 model there is a

degree of uncertainty over the input hydrographs used for the TUFLOW model. However the

correlation between the TUFLOW model and observed flood levels are a relatively good fit and do not

appear to have suffered from this uncertainty.

183

184

185

186

187

188

189

190

191

192

193

0 100 200 300 400 500 600 700 800

Wate

r Level (m

AH

D)

Hours DPI Level Namoi River Flood Study Mike11 33016 results

Current Mike11 results 33006.13 Current Mike11 results 31512

TUFLOW modelled

Wee Waa Levee Flood Investigation

43207388/NWC-WAT-RPT/F3

D

Appendix D 1% AEP flood inundation extents over time

Wee Waa Levee Flood Investigation

Appendix D - 1% AEP flood inundation extents over time

43207388/NWC-WAT-RPT/F3

68.25

79.25

84.25

89.25

Wee Waa Levee Flood Investigation

Appendix D - 1% AEP flood inundation extents over time

43207388/NWC-WAT-RPT/F3

104.25

peak

Figure Appendix D-3 Progression of flooding through Wee Waa when the levee is overtopped during a 1% AEP design flood event

Wee Waa Levee Flood Investigation

43207388/NWC-WAT-RPT/F3

E

Appendix E Flood Extents and Hazard Mapping