We highly recommend innovators read through the questions and answers shared below. Many of these questions were addressed in the challenge webinar (catch the recording here) and a few at the bottom are new.

Have a question that's still not answered? Comment in the challenge forum and we'll do our best to find you an answer.

 

1) Do we have to design a foundation for the seawall or will someone else provide that?

Yes, we do expect the competitors to submit a complete solution. Depending on each individual’s proposal (for ex. gravity wall vs a precast concrete driven type) it may require a foundation or some sort of footing or base.

 

2)  Is crushed rock available for erosion control at the base?

Currently, the seabed condition around the future seawall is entirely sandy. Ideally, once the seawall is built, crushed (amour) rock should be provided at the base for the entire length to prevent erosion (scouring).

 

3) Is there bedrock beneath the sand of the bay? If so, how deep?

Our geological survey showed there is no bedrock beneath the bay. Summary below

 

Clay: -4.5 to -7.5m

Silty Sand: -7.5 to -11m

Silty gravel: -11 to -14.5m

Gravelly sand: -14.5 to -34m

 

4) Do you have a target in mind for seawall lifetime?

50 years life expectancy before major repair

(http://climate-adapt.eea.europa.eu/metadata/adaptation-options/seawalls-and-jetties)

 

5) Do you have a plan for boardwalk construction? Or would you like us to also design the boardwalk? I imagine the seawall and boardwalk should look coherent.

The main scope of this competition is to address the seawall. Competitors can submit a design that incorporates the boardwalk and show the relationship between the two, but that is not something to will weigh in during the judging.

The organizer plans to engage at a later date a landscape consultant that will design the boardwalk, including all the hardscape, railings, etc.

 

6) Should we allow for pedestrian access to the floating pontoons of the marina in the design?

No, the organizer will coordinate this at a later date together with the marina consultant, depending on the berthing layout and the type of pontoons.

 

7) How close to the seawall will be boats be moored? Will any boats be moored directly against the seawall?

We are currently working with the marina consultant towards defining a berthing layout, but overall our intention is not having boats moored directly against the seawall (Mediterranean style). Thus, the competitors should not consider any potential mooring or anchoring loads for their proposals.

   

8) Do you have any requirements for pedestrian safety while walking along the upper promenade? Railings etc.?

Similar to question 5, competitors can submit a design that incorporates the railings and shows the relationship between the two, but that is not something to will weigh in during the judging.

 

9) What kind of businesses will be along the seafront? Are there any particular architectural guidelines that they will be adhering to?

Along the promenade, a large number of restaurants and cafes will be developed. Their architectural language will be contemporary with a few Balinese accents.

 

10) Sustainability is obviously the key to this design. Over what kind of timescales do you wish us to consider the environmental impact of the wall? For example, a seawall with a longer lifetime but a less sustainable choice of raw materials may out-perform a seawall made from sustainable materials that last only a few years, but of course, this depends on the timescale by which you measure the environmental impact.

The seawall is part of the islands infrastructure and a critical component, for which lifespan is the most important characteristic. Therefore similar to question 4, we expect a lifespan of at least 50 years without any major repairs.

 

11) What is the minimum radius of curvature of the seawall? (the curve of the seawall as it follows the curve of the bay)

The curvature of the seawall is very small in relationship with its length. At the maximum curvature point, the radius is about 100m and goes up to about 180m radius for the rest of the zones.

 

12) With sea levels rising, why even consider an island unless the land is to be built up? But then, I guess a good seawall would take care of the "rising sea level" problem.

Rising sea levels is something that we have considered during the masterplan design and engineering. We have planned for the next 100 yr of sea level rise and storm surges, that is why we have the future boardwalk level at +4.0m.

 

13) In the judging criteria, what do you mean by the seawall having “visual access and pedestrian connectivity with the water”?

Visual access refers to not having any elements that would obstruct the view towards the water. Pedestrian connectivity means that in certain locations, people will be able to get closer to the water. This can be translated in a form of steps for example, on which people can sit.

 

14) In the judging criteria, what do you mean by the seawall “must include an upper promenade, and could include a lower promenade and/or capping structure.”

The upper promenade refers to the +4.0m level on the land side, that will be used by pedestrians, cyclists, restaurant terraces, etc. This upper promenade can sit directly over the vertical wall and act as capping structure (beam). As many times people want to get as close to the water as possible, competitors can propose a second promenade that is positioned on the side of vertical wall and at a much lower level. Depending on the solution this can be fixed (with certain disadvantages, tide considerations etc) or take the form of a floating pontoon that runs along the vertical wall and also provides the access towards the marina berths.

 

Not answered in the webinar:

 

15)  Can you give us an overview of the existing ecosystem in the bay? Flora, fauna etc.?

No particular or important ecosystem has formed in the area. There are a few fish and crustaceous, but no corals or seaweed can be found inside the bay area. The seabed is sandy throughout.

 

16) Financial feasibility is one of your criteria. Do you have any reference pricing for conventional seawall installation in Indonesia?

We do not have any price reference at this time. As a property developer, we are waiting for the competition results before engaging a contractor to price out the solution.

 

17)  Is there a monetary limit to building the seawall?

Our project is a commercial development, and the overall cost of the competitor’s proposals cannot be out of range as compared to today’s typical seawall solutions. Should not be more than a typical revetment wall in this area.

Please note the information given is only as a guide and reference and the competitors will need their due diligence to check.