Lots to read and process from the corridors of Council, who “are committed to ensuring your voice is heard when it comes to the decisions that affect your lives, your future and our City”… “your feedback may result in changes being made.” CPPA committee members have been perusing the council documents to glean the local relevance for our community.
To explore the CPPA's review visit the links below
Showing posts with label Floodplain Management. Show all posts
Showing posts with label Floodplain Management. Show all posts
Sunday, 11 July 2021
Tributary Flood study for Puntei Creek Catchment
Comments are due by 5pm Wednesday 28 July. https://shape.lakemac.com.au/lake-tributary-flood-studies
The Puntei Creek Catchment is 1.52 km2, collecting rainfall and stormwater runoff from Kilaben Bay, Carey Bay, and Toronto. The upper-mid catchment is heavily vegetated and the creek crosses Jarrett St via a boxed-culvert, the lower catchment contains the commercial and residential properties, the creek flows into Lake Mac under Excelsior Pde at Carey Bay.
Of the eight catchments studied in the report, the average annual tangible flood damages for Puntei Creek were the second most costly with projected figures of $814,000/yr. This measure is used to estimate flood damages over a range of flood events and represents the equivalent average damages that would be experienced by the community on an annual basis, by taking into account the probability of a flood occurrence over the long term.
The Tributaries Flooding report states the residents at the bottom of Puntei Creek are highly vulnerable to sea level rise. In flood events Puntei Creek runoff will produce significant inundation across Excelsior Pde. In the mid-lower catchment there are a significant number of properties subject to flooding, overland flow will occur through properties on Jarrett Street between the creek and Oakhampton Ct when the capacity of the Jarrett Street culverts is exceeded. The commercial/industrial properties on Excelsior Pde that back onto the creek, which are low lying, will also experience relatively frequent overland flow inundation. Some of the residential properties in the lowest part of the catchment, bounded by Ambrose St., Excelsior Pde. and Laycock St. are below 1.5 m Annual Height Datum, and will be affected by both Lake Macquarie flooding and local catchment flooding and may no longer be habitable with a rise of more than 0.5 m of the average lake level.
This timely report is using historical data and as we are all too well aware the increasing development of the catchment is underway, reducing vegetation and increasing hard surfaces, resulting in more and faster runoff...and on top of that the compounding impacts of climate change make commenting on this report a high priority.
Comments from the report include;
The Puntei Creek Catchment is 1.52 km2, collecting rainfall and stormwater runoff from Kilaben Bay, Carey Bay, and Toronto. The upper-mid catchment is heavily vegetated and the creek crosses Jarrett St via a boxed-culvert, the lower catchment contains the commercial and residential properties, the creek flows into Lake Mac under Excelsior Pde at Carey Bay.
Of the eight catchments studied in the report, the average annual tangible flood damages for Puntei Creek were the second most costly with projected figures of $814,000/yr. This measure is used to estimate flood damages over a range of flood events and represents the equivalent average damages that would be experienced by the community on an annual basis, by taking into account the probability of a flood occurrence over the long term.
The Tributaries Flooding report states the residents at the bottom of Puntei Creek are highly vulnerable to sea level rise. In flood events Puntei Creek runoff will produce significant inundation across Excelsior Pde. In the mid-lower catchment there are a significant number of properties subject to flooding, overland flow will occur through properties on Jarrett Street between the creek and Oakhampton Ct when the capacity of the Jarrett Street culverts is exceeded. The commercial/industrial properties on Excelsior Pde that back onto the creek, which are low lying, will also experience relatively frequent overland flow inundation. Some of the residential properties in the lowest part of the catchment, bounded by Ambrose St., Excelsior Pde. and Laycock St. are below 1.5 m Annual Height Datum, and will be affected by both Lake Macquarie flooding and local catchment flooding and may no longer be habitable with a rise of more than 0.5 m of the average lake level.
This timely report is using historical data and as we are all too well aware the increasing development of the catchment is underway, reducing vegetation and increasing hard surfaces, resulting in more and faster runoff...and on top of that the compounding impacts of climate change make commenting on this report a high priority.
Comments from the report include;
- (p5) “Some communities around the lake edge are highly vulnerable to sea level rise, notably those residents situated at the bottom of Puntei Creek...”.
- (p19) “The road crest (Excelsior Pde) is very low-lying …It is likely that Puntei Creek runoff will produce significant inundation across the road, particularly if there are coincident elevated water levels in the Lake Macquarie waterway downstream. Some of the houses in the downstream part of this catchment have floor levels less than 1.5 m Annual Height Datum (AHD).”
- (p77-78) The catchment summary
- ”Puntei Creek…in the mid- to lower-catchment there are a significant number of properties subject to flooding.
- Overland flow will occur through properties on Jarrett Street between the creek and Oakhampton Ct when the capacity of the Jarrett Street culverts is exceeded, as the low point in the road crest is not aligned with the creek. Water that overtops the road will flow through these properties and return to the open grass swale further downstream.
- The commercial/industrial properties on Excelsior Pde that back onto the creek are low lying and will experience relatively frequent overland flow inundation, with above floor inundation likely in a 1% Annual Exceedance Probability (AEP) event.
- Some of the residential properties in the lowest part of the catchment, bounded by Ambrose St., Excelsior Pde. and Laycock St. are below 1.5 m AHD, and will be affected by both Lake Macquarie flooding and local catchment flooding. Some of these properties will be inundated above floor level more frequently than a 10% AEP event. Flood risks for these properties will be exacerbated even further by Sea Level Rise, and may no longer be habitable with a rise of more than 0.5 m of the average lake level.
- The Puntei Park Dog Exercise Area is subject to low hazard flooding in the 1% AEP, escalating to high hazard in the Probable Maximum Flooding (PMF). A combination of rising access and unpopularity for use during intense rain means risks to life are low.
- The Paradise Palms Caravan Park is subject to low hazard flooding (H3 and below) in a 1% AEP event, escalating to high hazard (H4) during a PMF event. Rising egress is available from most locations in the site, so evacuation on foot will be feasible for mobile occupants. Occupants with limited mobility will be vulnerable to being trapped in hazardous flow in a PMF event”
Tuesday, 13 November 2012
Lake Macquarie City Council Floodplain Management Committee
~Expressions of Interest ~
~Community Representatives ~
~Applications close 9am, 12 November 2012 ~
Are you interested in flood risk management and have the capacity to consult with community members to make objective, evidence-based decisions about floodplain management in the City of Lake Macquarie?
Council is seeking seven (7) community members to join the Lake Macquarie City Council Floodplain Management Committee, including:
Three (3) community representatives from flood-affected locations within the City
One (1) delegate from each incorporated Aboriginal Land Council within the Lake Macquarie Local Government Area
One (1) representative of an established environmental group
The role of the Committee is to provide guidance and assistance to Council on issues relating to sustainable floodplain management. The membership term is for 4 years, meeting 3 to 4 times each year. For further information or to register your interest, please contact Greg D Jones, Senior Sustainability Officer (Natural Disaster Management), on 49210303, gdjones@lakemac.nsw.gov.au, or Box 1906 HRMC NSW 2310.
~Community Representatives ~
~Applications close 9am, 12 November 2012 ~
Are you interested in flood risk management and have the capacity to consult with community members to make objective, evidence-based decisions about floodplain management in the City of Lake Macquarie?
Council is seeking seven (7) community members to join the Lake Macquarie City Council Floodplain Management Committee, including:
Three (3) community representatives from flood-affected locations within the City
One (1) delegate from each incorporated Aboriginal Land Council within the Lake Macquarie Local Government Area
One (1) representative of an established environmental group
The role of the Committee is to provide guidance and assistance to Council on issues relating to sustainable floodplain management. The membership term is for 4 years, meeting 3 to 4 times each year. For further information or to register your interest, please contact Greg D Jones, Senior Sustainability Officer (Natural Disaster Management), on 49210303, gdjones@lakemac.nsw.gov.au, or Box 1906 HRMC NSW 2310.
Wednesday, 7 December 2011
LMCC Plans and Planning
There’s always something happening at Lake Mac Council, sometimes it seems to happen quickly and other times it seems to take a while.
A review of the Flood Plain Management Strategy has been promised since the Pasha storm of 2007. The draft was released for comment in October with submissions closing on 28 November. Sometimes Council will accept late submissions so you may still have opportunity for feedback.
There is a very informative brochure on Council’s website outlining the findings and recommendations.
It states that :-
The Local Environment Plan 2011, the draft Lifestyle Strategy 2030 and the Development Control Plan 2011 will all go on exhibition together in the first half of 2012, a trifecta of planning instruments to ponder.
Until then there are lots of interesting maps already prepared to have a look at including zone maps, flood maps, acquisition maps, urban release maps, heritage maps, minimum lot size maps, biodiversity maps, building heights maps, foreshore building line & coastal risk maps and a few others. Here is a link that will get you to them.
A review of the Flood Plain Management Strategy has been promised since the Pasha storm of 2007. The draft was released for comment in October with submissions closing on 28 November. Sometimes Council will accept late submissions so you may still have opportunity for feedback.
There is a very informative brochure on Council’s website outlining the findings and recommendations.
It states that :-
- The average water level in the lake will rise to 1m Australian Height Datum (AHD) by 2100. The lake rose to about 1.10m AHD in the June 2007 storm.
- The worst floods are caused by heavy rain at the same time as high tides and storm surges.
- The risks from rising lake levels to 1m AHD due to sea level rise will permanently cover some low-lying area around the lake foreshore. At least some portion of 3300 residential properties may be affected by permanent inundation by 2100.
The Local Environment Plan 2011, the draft Lifestyle Strategy 2030 and the Development Control Plan 2011 will all go on exhibition together in the first half of 2012, a trifecta of planning instruments to ponder.
Until then there are lots of interesting maps already prepared to have a look at including zone maps, flood maps, acquisition maps, urban release maps, heritage maps, minimum lot size maps, biodiversity maps, building heights maps, foreshore building line & coastal risk maps and a few others. Here is a link that will get you to them.
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