Awarded
Hawick Flood Protection Scheme - Main Works
Descriptions
The Hawick Flood Protection Scheme (HFPS) will provide a significant benefit to the residents and businesses of Hawick by virtue of alleviating the effects of a major flood event in the River Teviot. The town has suffered from flooding in the recent past, including large numbers of properties inundated in 2005 and 2015, causing significant economic and human adverse effects. The HFPS will comprise the construction of nearly 6km of entirely new flood defences, the great majority of which are flood defence walls. The walls will generally be sheet pile cored to a depth of between 4 and 12m below ground level, with reinforced concrete pile cap and stem. Exposed concrete will either be clad in natural stone or finished with a formlined pattern. Around 60 glass panels, each 2.5m wide and up to 1.4m deep are to be set into the floodwalls. Approximately 1.8km of the defences will require to be constructed directly within the watercourse. A short section of embankment will comprise a sheet pile core with locally won granular shoulders. Eight entirely new automatic surface water pumping stations will provide further protection, comprising wet wells up to 6m deep and 5m diameter, valve chambers up to 4m deep and 6m diameter and GRP kiosks to house the power and control units. The MEICA design for the surface water pumping stations will be the main contractor design element. The discharge capacity of the submersible pumps will vary within each pumping station, with the largest requiring to deliver up to 450 l/s. A ninth pumping station will be required within the Hawick waste water treatment works to assist the works during high flows and flood events, with submersible pumps capable of delivering up to 1100 l/s of storm water. Approximately 275m and 185m of new culvert will be required to discharge the Stirches and Boosie Burns respectively into the River Teviot. Requirement to install 9 new single leaf lift hinge floodgates within the flood defences to maintain pedestrian and vehicle access and 2 sets of stop log type demountable barriers are also required. The existing Lawson, Victoria and Mansfield steel truss footbridges will, as a minimum, require to be raised by 1.0m, 1.0m and 0.4m respectively at their current location, comprising new abutments and extension legs welded to the deck supports at midspan. The current preferred option which is currently subject to SUSTRANS funding confirmation, is to remove the existing bridges from their supports and replace with entirely new steel truss structures at new locations, with deck widths up to 4.0m wide. If SUSTRANS funding is confirmed, the new bridges will be part of a new 7.0km combined pedestrian and cycle route throughout Hawick, which will be delivered by this procurement excercise. The replacement bridge option will be the scenario which is to be priced as part of this procurement exercise. Further details of the work description are appended to the ESPD. Construction of the HFPS will be subject to a number of environmental and pedestrian / traffic management constraints, including restrictions on the time of year when works can be carried out within or adjacent to the river channel in order to reduce the impacts on salmon migration, and restrictions on which roads and footpaths can be closed simultaneously. The Council are currently carrying out an advance works contract which comprises the diversion of a large number of existing public utilities and the felling of the majority of trees which may be impacted by construction of the project. This procurement exercise will still require the protection and small scale diversion of some public utilities and a small amount of tree felling. The Council intend to appoint a main contractor to carry out the construction of this project under the terms and conditions of NEC3 (Engineering and Construction Contract) Option A contract.
Timeline
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Tender Regions
Scotland
CPV Codes
45246410 - Flood-defences maintenance works
45246000 - River regulation and flood control works
45200000 - Works for complete or part construction and civil engineering work
42131143 - Flood-control valves
45223200 - Structural works
45262640 - Environmental improvement works
45220000 - Engineering works and construction works
45246400 - Flood-prevention works
45246200 - Riverbank protection works
45000000 - Construction work
44212382 - Floodgates
71300000 - Engineering services
45247212 - Dam-reinforcement works
45247270 - Reservoir construction works
Keywords
flood-control valve
overflow valve
storm-water valve
pressure relief valve
emergency flood valve
safety overflow valve
floodgate valve
flood protection valve
backflow flood valve
flood defense valve
floodgates
flap gates
sluice gates
water flow control gates
flood control gates
hydraulic gates
storm surge gates
tidal gates
flood protection barriers
gate structures
construction work
building construction
civil engineering
infrastructure projects
site construction
building sites
structural work
construction services
renovation work
public works
construction works
building projects
infrastructure
turnkey projects
structural construction
general contracting
site preparation
earthworks
engineering construction
civil engineering project work
infrastructure and structures build
general engineering work
technical construction services
integrated engineering works
structural and civil works
multidisciplinary engineering build
comprehensive construction works
civil-structural engineering
load-bearing system build
superstructure erection
foundation and framework works
civil structure installation
supporting frame assembly
basic structure construction
skeleton works
reinforced structure build
structural shell creation
river regulation
flood control works
hydraulic river engineering
watercourse civil works
flood defence construction
channelization works
riverbank stabilization
flood mitigation infrastructure
water level control works
river training
riverbank protection works
riprap installation
bank revetment
slope stabilization
erosion prevention
vegetated bank structures
river edge consolidation
embankment toe protection
bank reinforcement
watercourse protection
flood-prevention works
storm surge barrier installation
anti-flood infrastructure
levee system build
floodgate construction
overflow management works
water containment projects
river flood control
drainage prevention systems
flood defence engineering
flood-defences maintenance works
floodwall repair
levee reinforcement
flood barriers servicing
embankment upkeep
spillway maintenance
river defence rehabilitation
dam crest repair
protection structure maintenance
flood prevention system upkeep
dam reinforcement
dam strengthening
wall buttress installation
dam retrofitting
spillway reinforcement
dam stability works
structural dam upgrade
dam wall repair
embankment reinforcement
dam integrity improvement
reservoir construction works
water storage reservoir build
reservoir earthworks
dam‑reservoir integration
intake reservoir build
water basin construction
storage reservoir civil works
reservoir embankment installation
reservoir excavation
reservoir infrastructure erection
environmental improvement works
ecological restoration civil works
landscape enhancement works
remediation infrastructure
habitat restoration structures
engineering consultancy
specialist engineering services
technical engineering solutions
engineering expertise
professional engineering
engineering advisory
engineering project support
technical engineering provision
multidisciplinary engineering
expert engineering services
Tender Lot Details
2 Tender Lots
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Possible Competitors
1 Possible Competitors
