Consultation Meeting, Saturday 2/5/15

By John Mills
Paekakariki Seawall Replacement
Consultation meeting Saturday, 2/5/2015 attended by about 40 people.

The bulk of the post has been removed to gain an informed and balanced presentation of the options.

 

Should I care about what we end up with down on the beach front?
Well maybe yes, given the fact that my family and I together own 7 properties in the town, with 6 sited directly opposite the beach front. This could be a powerfully motivating factor I would suggest.

Keep watch for regular updates as the debate progresses.

Stepped Concrete Option 2

Stepped Concrete Option — Paekakariki Seawall
List of advantages over the timber option
• Increased public safety:
o No unballastered high walls.
o Quick access observation platform for water sports.
• Wall usability:
o Enhanced beach accessibility.
o Multiple height single walk levels.
o Allows continuous seating along the dry sand beach whatever the tide level.
o Grandstand like usage. Allows continuous multiple height seating along the entire wall whatever the beach level.
• Longevity: more than three times the minimum life span of timber. (100 + years)
• Reduced wave reflection: Reduces storm surge and high tide impact on the seawall. This also reduces scouring.
• Reduced Maintenance: Virtually eliminates maintenance. Bolted timber becomes increasingly costly over time.
• Increased foundation depth:
o Washout risk to support material greatly reduced/eliminated by increased depth of the proposed front sub wall apron.
o Subterranean wall apron eliminates the need for seaward row of support piles giving 6.6 times the ground bearing capacity of the proposed support piles.
o Cantilevered strength provided by the sub wall apron eliminates/reduces the need for expensive tie backs.
• Lower impact: The concrete step option is far less labour intensive at the site.
Precast units constructed elsewhere craned/jetted into place, eliminates the need for large messy on-site timber construction in the wet.
• Faster construction time: The concrete step option would over all be 2 times faster than the single timber constructed wall.
• Affordability: Contractors estimate $8,200,000 (within allocated Budget)

Put together by John Mills, Constructiv, Shane Murland, Piling, and Ducare Industries.

No Parking Issues? We disagree!

The Memorial Hall and Campbell Park, situated on the Paekakariki beach front, are regularly used for both functions and sports.

Parking at these events is limited to minimal on-site and roadside areas, and causes much chaos on this traffic-heavy street.

 

 

 

Football on a Saturday morning.

Football on a Saturday morning.

Chaos to the North...
Chaos to the North…

...and the South.

…and the South.

Comment after the meeting

I was much encouraged by the decision to scout out some landscape architectural talent to work on options for presentation to the community consultation process. This is critical to the final result. I believe the Landscape Architecture needs to be addressed early and also through the entire process. Also the realistic overall costs need to be factored in.

In all the coastal protection works to date the order has been first practicality then engineering which has resulted in the rock revetment, – an industrial solution imposed on a residential location.

I would like to suggest that the loose order of items to be ticked off on a project such as this ought to be:

  1. Practicality
  2. Social Impact
  3. Environmental Impact
  4. Aesthetic importance
  5. Engineering

The Council resource consent process, including final approval, can impact significantly upon a project, and requires to be managed in order to minimize possible time delays, and ensure that the right technical supporting information is provided with a resource consent application.  An early meeting should be sought with the Council resource consent planners in order to confirm the following;

  • The technical information that the Council will require to be provided with an application;
  • Who should be consulted before lodging the application;
  • Whether the application is likely to a notified or non-notified resource consent application (this is critical in terms of timing and cost), and
  • If the resource consent application is to be non-notified whose written approval as adversely affected persons will be required.

Happily this appears to be the order underway in the lead up to the application required in the resource management process.

 

 

The most essential aspect of any wall will be the foundation which will probably have to be a concrete footing and toe. Only this can give the secure reinforced platform for such constructed wall or walls which doubles as a safe people zone. This foundation can be installed as a first stage of the process which will immediately perform the two most pressing functions irrespective of what chosen option is built on top of it.

  1. Security against undermining.
  2. To buttress the existing poles which will eliminate the need for the fast failing tie backs.

This is the only pressing requirement until we start to actually see the promised radical sea level rise. And the concrete will be exposed on the dry sandy beach only when it is performing it’s primary function; This is to protect the toe of the wall on the back of stormy weather events.

The cost of this work is about two million dollars, around half of the cost of our entire concrete wall proposal. And it can mostly be built in pre-assembled segments installed from the road in a smooth, efficient, and safe operation.

WELCOME TO SEAWALLS.CO.NZ

Welcome to www.seawalls.co.nz!

This is the best place to get practical and technical information about the seawall situation on the Kapiti Coast. Based in Paekakariki and living at the beach, we have acquired an excellent grasp of the implications both good and bad to all of us who reside on the coast.

What has the Kapiti District Council been doing on the foreshore? Too much which is wrong and not enough which is right!

“The ideals we hold up for our town reflect the value we place on ourselves”