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Collapse Issue 561:<br />23 Jan 2023<br />_____________Issue 561:
23 Jan 2023
_____________
Collapse  NEWS NEWS
Draft flood plan proposes new minimum floor levels
Sammy Seal becomes ferry passenger
Meeting to discuss floodplain and council land plans
Working together 20 years later
Council may spend $133,000 on rare bushland project
Liberals select former councillor as election candidate
Nambus leaves Ettalong for Phillip Island
Taken to hospital
Family fun at Pearl Beach for Australia Day
Wednesday night bingo resumes
Sunny weather for a trip to Patonga
Men's Shed to consider conferring life membership
Bling It Up Gala to raise money for the Iris Foundation
Car boot sales return to Rogers Park
Donation for renovations to Umina CWA hall
Donation to youth cottage
Palm Beach ferry diverted
Rotary club prepares for year ahead
Body of missing bushwalker found at Patonga
Help with a tow
Events planned at Pearl Beach hall
Maritime-themed play area is open
RSL sub-branch to hold annual meeting
Call wildlife rescue for help with tangled birds
Month's rainfall is about average
Collapse  PLANNING PLANNING
Dual occupancy application resubmitted under new rules
Plan model is based on one flood event 35 years ago
Flood study tells of smaller extent and shallower depths
Flooding consultation is 'second round'
Collapse  FORUM FORUM
Good Samaritan helps a wild creature in need
Need for relief for the elderly at the bus stop
Wanting to walk, but where's the shade?
Do something before we have a fatality
Community is secondary without development foresight
'Low density' is not 94 people on two residential blocks
Collapse  HEALTH HEALTH
New Covid health management plan welcomed
New aged care executive appointed
Active virus numbers lowest in two months
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Bush dance continues after 25 years
Troubadour expands its range of concerts and activities
Free mardi gras viewing party in Ettalong
Collapse  EDUCATION EDUCATION
Princess the pup is back
Parents raise $18,000 for school, with more to come
Bathroom upgrade for junior students
Bluey features on new basketball court
Students urged to take up training opportunities
List of items for Ettalong students
Start dates announced for Woy Woy campus
Uniform shop opens from Friday
Instructions for first day Year 7 students
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Bunnies to return to senior competition?
Spot the rip
Boardriders seek member registrations before March
Grommet boardriders to hold registration day
Premier 'joins' Umina surf patrol
Bridge club trials Wednesday afternoon competition
Disabled surfers need volunteers for February event
Veteran bowlers surveyed on format preferences
Charity bowlers raise $1650
Umina United to hold junior grading
Eagles schedule pennant trials
Umina Rookies attend Central Coast challenge
Roosters to hold girls' meet and greet night

Draft flood plan proposes new minimum floor levels

A new floodplain management plan would raise minimum floor level requirements over most of the Peninsula.

Central Coast Council's draft Woy Woy Floodplain Risk Management Plan is currently on exhibition for public comment.

New floor levels will be almost 1.3 metres above the one per cent annual probability flood level, commonly referred to as the one-in-100-year flood.

They are based on a 500mm "freeboard" above the flood level, plus another 0.74 metres to accommodate sea level rise.

It also recommends that the ground level (or "landform") of low-lying land subject to tidal inundation be raised in response to sea level rise.

Without this, it says: "By 2100, there will be extensive daily flooding in the Woy Woy CBD and Booker Bay, while Ettalong will see significant flooding in the lowest roads and private properties".

Among a number of recommended changes to the council's planning provisions, the plan recommends provisions to ensure "significant increases in perviousness and rainfall infiltration across the Peninsula" and "allowing more flood compatible development (by) requiring open spaces which also convey flood water in rare storm events".

The plan also recommends a shift of focus to providing a "sustainable level of drainage service", away from prohibitively expensive drainage projects.

"Requiring all major stormwater systems to convey peak one per cent flows is likely to not be achieved given the initial costs associated with construction.

"A financially-sustainable approach to stormwater asset management will be required into the future.

"Even with existing infrastructure, the consequences of one per cent flooding are generally not significant on the sand flats of the Peninsula.

"However, ongoing maintenance will need to be undertaken to ensure services are not reduced back to unacceptable levels (eg blockage of pipes and culverts).

"Ideally, a future level of major stormwater system service will enable the entire system to be upgraded in a financially-sustainable manner."

It recommended that "within the sand flats only, the requirements of the Central Coast Council Civil Works Specification - Design Guideline be relaxed to provide an alternative level of service".

This is accompanied by recommendations for six infiltration pits in key locations and for measures which aim to ensure overland flood flow paths are kept clear.

"Property owners and residents living adjacent to the main drain (Teatree Creek) and Kahibah Creek can significantly affect flood behaviour with the types of structures constructed within the floodplain."

The plan said that "landscape works, sheds, stockpiling and other small works ... can either remove flood storage or deflect flood waters and increase surrounding flood levels" or "be a

source of debris causing blockage downstream".

It recommended an "encroachment policy to manage illegal structures in the floodplain" and an education program for property owners with obstructions that were not illegal.

The new plan has nine broad recommendations, which also cover setting up evacuation centres, establishing a flood warning system, providing flood signs and flood education programs.

The plan acknowledges that it is based on modelling that is "calibrated" against just one flood 35 years ago, using flood levels at just 20 locations, and without detailed rainfall data or drainage flow measurements.

However, the modelling shows "a smaller flood extent and shallower flood depths in general" than the previous flood study in 2010.

The plan also states that two associated studies were undertaken to prepare for this plan.

One was the Woy Woy Climate Change Adaptation Study (Rhelm, 2021b) "to identify feasible strategies to adapt the low-lying areas of Woy Woy to the impacts of sea level rise".

The other was the Woy Woy Integrated Water Management Cycle and Case Study Everglades Catchment (DHI, 2021) "to define flooding in this catchment utilising an integrated surface water and ground water model, and identify potential solutions to mitigate flooding".

Neither study has been circulated with other documents supporting the Plan.

Public submissions will be received until Wednesday, February 15.





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