Erosion

Beach Road Closure Wed 16 Feb 9am to 1pm.

PCC have just advised that it will be closing Pukerua Beach Road between 9am and 1pm tomorrow (Wednesday).

There will be emergency access, however residents are urged to find alternate access options or to remain at home during this time.

Given the narrow nature of Pukerua Beach Road, a full closure is required to carry out work to construct a bund on the coastal side of the road to prevent water going down the bank. This is one of the actions recommended by geotechnical advisors ENGEO.

Claire Giblin will be writing a fuller community update, which will sent out later today but wanted to alert residents to the closure as soon as possible.

PCC apologises for the inconvenience.


Pukerua Beach Road –Ocean Parade

Latest reports from PCC re the Pukerua Beach Road situation.

Council has a geologist on site at the moment and PCC will give updates. Its all just precautionary at this point. Its been challenging weather across the whole city this weekend. There have just been reports of some cracks on Pukerua Beach Rd so they are assessing that currently and any slip risks to Ocean Parade.
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There are numerous crews out this way assessing the conditions. and a few PCC staff on the ground speaking to the residents who may be impacted. PCC wanted to reassure residents that Downer will be on site all night and PCC Emergency staff are also here should anyone need support with finding alternative accommodation (should any areas be deemed unsafe – which has not been confirmed). PCC will send an update when there more info from the crew on the ground.

Update from PCC on Pukerua Beach Road Slips

Good morning,

This email is intended to update you on our progress with the investigation around the slips on Pukerua Bay Beach Road.

Our thanks to the residents who have worked with the Council and geotechnical specialists ENGEO to share their knowledge, and allow us access to their properties.

We received ENGEO’s latest report yesterday. We will make it available once we’ve had time to review it and are able to confirm our preferred options. We are looking at several stability options with ENGEO and will need to align them with available funding.

We appreciate you are keen to see some action and we ask you to be patient so we can fully understand the cause of the slips and plan accordingly.

Our maintenance contractor Downer continues to monitor the road during heavy rain, and clear rock falls, as it did last weekend.

ENGEO has good local knowledge of the area and underlying issues having been involved with investigations into the following slips:
• 6 Ocean Parade (November 2016).
• 7A Haunui Way (2017 – 2018).
• 41 Haunui Road (October 2018).
• 57 Haunui Road (November 2020).
• 47 Haunui Road (December 2020).
• 19 Ocean Parade (March to August 2021).
• 1 Ocean Parade (8 December 2021).

The two (2) crib walls on Pukerua Beach Road are a separate matter to the slips but will also be investigated (to come).

Wellington Water recently undertook a leak detection survey of the water pipes in the area above Pukerua Beach Road:
• Two (2) minor leaks were discovered.
• To the best of their knowledge there are no stormwater pipes in the area.
• Residents’ stormwater is discharged to the ground via soakage pits.
• The likelihood that a leaky potable and/or stormwater pipe is contributing to the groundwater concerns in the area is very unlikely.
• An assessment of potential leaks from sewerage pipes is ongoing.

The common theme in all these slips is that they appear to be the result of erosion from water flow of both surface water and groundwater. It is understood that many, if not all, of the stormwater drains from the properties along Haunui Way and Haunui Road discharge directly to the ground, and this combined with natural infiltration of surface water through highly permeable surface soils, is the likely main reason for high groundwater flows in the area.

Rest assured remedial actions are in the planning phase and will be programmed accordingly (especially external funding).

We will continue to keep in touch as our investigations continue, and welcome your feedback.


Ngā mihi
Claire

Rebuild of crash barrier north of Northern Lookout Starting 7 February

Capital Journeys have advised that reconstruction work will start on the crash barrier just north of the Northern Outlook. The text follows:

We are replacing a 170m roadside barrier at the northern end of Pukerua Bay. The work will take place at night, 8pm-4.30am from Monday night 7 February for approximately 8 to 14 nights – weather permitting.

The current barrier has reached its scheduled end-of-life and will be upgraded to the latest safety standards.

This is a lengthy job because of the site’s complexities. The posts on which the barrier is fixed need to be driven into ground close to a major underground communications line. To prevent this line being struck, a hydrovac will be used to pothole each post location before driving the posts. This will be noisy work but, where possible, two hydrovacs will be used to reduce the amount of time taken to drive the posts. Other noisy machinery includes an excavator, grinder and plate compactor.

Attached is a copy of the notice to residents near the work. The notice will be delivered tomorrow, Wednesday.

There will be stop/go traffic control in place from 7pm to 5.30am.




Pukerua Beach Road Update

Pukerua Beach Road slip – update

From Claire Giblin PCC

This is a quick update to let you know what work has been done and what plans are in place regarding the slip that occurred above Pukerua Beach Road in December last year. Thank you to residents who have provided feedback and information, plus those who have given us access to their properties to review the slip. We appreciate this is an important issue for many of you and want to reassure you that we are treating it as a priority. Below is a list of actions underway: 

  • Geotechnical experts from ENGEO are continuing to assess the slip, identify any risks and possible remedial actions
  • We are looking at hydro-seeding the areas that have slipped to stabilise any remaining loose surface soil
  • We have asked Wellington Water to investigate for leaks on Haunui Way and Haunui Road to assist in locating the source of ongoing water run-off
  • We have carried out a drone inspection of the area
  • Our CE Wendy Water and Deputy CE Andrew Dalziel have toured the area with roading engineers to see the slip first hand
  • We will continue to keep residents informed, and are always interested to hear your views and ideas.

Ngā mihi
Claire

Coastal erosion workshop

We had an interesting session this afternoon with coastal researchers, Jim Dahm and Bronwen Gibberd, who are working for Porirua City Council to get information about coastal hazards and erosion, and starting to prepare long-term plans to prevent them getting worse.

We had a small turnout (about 10 locals), but they were mostly people who had lived at the beach for many years and could tell the researchers a lot about the beach and how it has changed over the decades. …

Coastal hazards and resilience community workshops

Porirua City Council is running workshops on coastal hazards, which includes the erosion the Pukerua Bay beach is suffering. They sent us the following information. If you’re interested in this, head along to St Marks, Rawhiti Road, Saturday 11 August, 2pm–4pm.

As part of the District Plan review, we [PCC] have engaged the Focus Resource Management Group to help us understand the coastal hazard risk in Porirua.  Principal members Jim Dahm and Bronwen Gibberd have a great deal of experience with the assessment and management of coastal hazards in New Zealand, and a long history of consultation with communities. Utilising their experience and local knowledge from those living next to the coast, we are now seeking to engage with those affected by coastal hazards in Porirua.

We will be running a coastal hazard seminar series to provide information about the coastal hazards and provide opportunity for the community to discuss the work in more detail with coastal hazards experts as well as Council staff. We are keen to talk directly with affected residents, and with other members of the community who have an interest. Through robust research and engagement with the community, we hope to ensure that the District Plan assists in building resilience to our coastal hazards.

Coastal hazards community workshops:

Plimmerton School: Saturday 11 August 10.00am – 12.00pm

St Marks Church Pukerua Bay: Saturday 11 August 2.00pm – 4.00pm

Titahi Bay School: Sunday 12 August 10.00am – 12.00pm

Paremata Boating Club: Sunday 12 August 1.00pm – 3.00pm

Pāuatahanui School: Sunday 12 August 4.00pm – 6.00pm

Local knowledge and views are essential to building a thorough understanding of coastal hazards in Porirua. We are interested in changes anywhere on the Porirua Coast and Harbour. Any information you can provide will be helpful and appreciated including:

  • any observed shoreline changes over the last 50-100 years.
  • how your property or the local coast been affected by erosion or flooding.
  • any old photos, early descriptions, old maps, etc.
  • any information on past coastal storms and their impacts (e.g. photos or observations of erosion damage and sea flooding).
  • people or groups who may have useful information (e.g. long-term residents, local historians).

For more information please see the PCC website – https://poriruacity.govt.nz/your-council/city-planning-and-reporting/district-plan/coastal-hazards/

Ocean Parade beach erosion meeting

Update: In January 2018 Porirua City Council built a small earth wall to stabilise the bank, which has stopped further erosion. This area is identified in PCC’s coastal management strategy as an area that needs protecting.

Background

Thirty Ocean Parade residents, including Iain MacLean from the Pukerua Bay Residents’ Association, came together on 2 December 2016 to discuss the rapid erosion of shorefront, civil emergency procedures post-earthquake (14 November 2016) and severe weather event (12-15 November) causing a landslide on Beach road – blocking access and damaging properties on Ocean Parade – of which three had to be evacuated over a twenty-four period.

Aerial view of the beach along Ocean Parade.

We enhanced the Parade’s resilience through self-help community initiatives in regards to civil emergency procedures but the issue of rapid shorefront erosion was considered as urgent. We collectively concluded that we want to increase awareness of the problem and the residents selected a small Steering Group to undertake action. We want to see the Porirua City Council recognise the urgency of the shorefront erosion and act quickly to mitigate the effects of the inundation and subsequent erosion of the shorefront along Ocean Parade, Pukerua Bay – in close consultation with Pukerua Bay residents but with having vision for a long term solution. …