Quirindi Floodplain Risk Management Study

1. Quirindi Floodplain Risk Management Study Progress update to FRMC 01/09/2010

2. Progress Snapshot • Inception Meeting - done • Site Visit – done, but more intended • Flood Model Review – 90% done, additional sensitivity simulations undertaken • Data Collection Review Report - started • Community Involvement Plan – done & submitted • Questionnaire Survey, Newsletter, Media – done, and being compiled • Flood Damages – not started, need floor survey

3. Flood History • Major flooding Feb 1955, 1971, Jan 1984 • Feb 1955 largest “in living memory” up to that date • Flood levels similar @ Confluence: 1984 >100mm 1955 and >200mm 1971 • Nov 2000 approx = 10yr event • Jan 1984 approx = 50yr event

4. Calibration - Hydrology

5. Calibration - Hydraulics

6. Calibration - Hydraulics

7. Flood Model Review

8. Flood Model Review

9. Flood Model Review

10. Sensitivity Assessment overflow + 0.1 n +0.5 overflow + 0.1 n +0.5 overflow - 0.3 n -0.3 overflow nil n 0.25

11. Further Checks inundation overflows inundation

12. LEP

13. Community Announcements

14. Key Messages – 51 respondents • Average respondents in Quirindi =32 yrs • 41 out of 51 had experienced flooding • Most experienced 2000 flooding, most others mentioned 1955, 1971 & 1984 • 32 out of 51 described negative effect • Non-direct = isolation, damage to roads • Preventative measures typically: • Monitor creek levels • Move stock and vehicles • Raise equipment & furniture • Sock up food • Clear drains around property • 80% in favour of focussing on a number of options, educating residents followed by flood and property modifications • General trend = property modification not favoured • Divided on levees • Clearing of Jacob and Joseph Creek • Concern about weeds, leaves 7 rubbish

15. Next steps • Survey brief & survey • Information Session and Agency focus group • Flood damages calculations • Options development

16. www.ghd.com