RIV_2600294 Ashley Rakahuri Stopbank Upgrade Investigation

Details

RFx ID :	34128140
Tender Name :	RIV_2600294 Ashley Rakahuri Stopbank Upgrade Investigation
Reference # :	RIV_2600294
Open Date :	Wednesday, 20 May 2026 3:00 PM (Pacific/Auckland UTC+12:00)
Close Date  :	Friday, 5 June 2026 5:00 PM (Pacific/Auckland UTC+12:00)
Department/Business Unit :	Field Services
Tender Type :	Request for Proposals (RFP)
Tender Coverage :	Sole Agency  [?]
Categories :	72000000 - Building and Facility Construction and Maintenance Services 73000000 - Industrial Production and Manufacturing Services 77000000 - Environmental Services 95000000 - Land and Buildings and Structures and Thoroughfares
Regions:	Canterbury
Exemption Reason :	None
Required Pre-qualifications :	None
Contact :	Craig Prebble 0272395638
Alternate Physical Delivery Address  :
Alternate Physical Fax Number  :

CRC seeks a provider who has experience with geotechnical investigation and
designing stopbanks and flood protection schemes. We have completed the
hydraulic modelling in house. Hydraulic modelling results files (i.e., water
surface elevation, depth, velocity, etc) will be provided by Environment
Canterbury for this work.
The provider needs to provide an initial geotechnical assessment (Part A), then
a detailed geotechnical investigation including necessary augering and test
pitting (Part B). Part B also includes the geometric design of stopbank crosssections, volume analysis and a risk based geotechnical review of the existing
stopbanks with recommended remediation to be undertaken with the upgrade.
A volume analysis is required to cover all stopbank materials including
quantities of culverts that may require extension. We have recently completed
CCTV survey inspections of all culverts that cross the stopbank scheme in this
area and will provide the results of these to assist with this work.
The provider needs to take a risk informed, pragmatic approach to the
investigation. The primary risk is considered to be erosion of the stopbank
during a flood, so the investigation and design should be undertaken with this in
mind along with considering other failure modes. It may not be possible to
provide the optimal engineering solution to the whole scheme, so we need to
know where the higher-risk sections are and what our options for the future
might be.
What we do not
want/need
At this stage we do not anticipate hydraulic modelling will be required by the
provider. Results files from the HEC-RAS 2D model developed by Environment
Canterbury will be provided including water surface elevation, depth, and
velocity.