Source: https://tendernation.io/opportunities/01a13bc1-6ee0-72f0-94a9-c788ee944f49/lot-c-river-colne-constructed-wetland-outline-design-and-feasibility closed GB open procedure Suitable for SMEs # Lot C: River Colne Constructed Wetland Outline Design and Feasibility [Lot C: River Colne Constructed Wetland Outline Design and Feasibility](https://tendernation.io/buyers/lot-c-river-colne-constructed-wetland-outline-design-and-feasibility) Estimated value £25,000 Published 18 Aug 2025 Deadline Closed 12 Sept 2025 ## Who can bid - Buyer says suitable for SMEs The buyer ticked “suitable for SMEs” on the notice. Anyone can still bid. - Below-threshold contract Buyers cannot shortlist bidders on suitability before tenders are in, so everyone gets to submit a bid (except some larger works contracts). [Procurement Act 2023, section 85](https://www.legislation.gov.uk/ukpga/2023/54/section/85) - Open procedure Anyone can submit a full tender; there is no shortlisting stage. [More contracts for small businesses and VCSEs](https://tendernation.io/opportunities/for-small-businesses) ## About this tender This tender will encompass the following activities. - Topographical, hydrological, sediment and water quality surveys to understand the through-flow regime, likely input quality and quantities for a range of surface water run-off conditions. - Strategic investigation of on-site ground contamination and suitability of existing sediments for re-use or to allow identification of requirements for disposal (including Water Regulations (WR), Waste Management (WM3), and Waste Acceptance Criteria (WAC) as needed). - Biodiversity Net Gain assessment and Preliminary Ecological Appraisal highlighting lessons learned from the historic wetland design where evidence exists. - A multi-criteria options appraisal matrix to record and assess relative costs and benefits of a variety of sub-options and approaches to determine an evidenced preferred option. - Lead a stakeholder workshop and consultation exercise. - Provide appropriate information design to support discussions with stakeholders including reference to options for sediment movement volumes, space for sediment drying / processing area, gravel quantities / sourcing, water volume and retention requirements for functional filtration and water quality improvements, options for widening boundary onto playing fields if needed, etc re design and permitting constraints. - Develop the preferred option into a more formalised and feasible outline design that can be used in wider consultation and in early permitting discussions to enable an iterative design process and clearly specifies the required detail going forwards. - Identify the requirements for gaining consents. - Create / initialise necessary documentary evidence and applications for consents to build, using approved outline designs. - Attend regular meetings with the project manager and external stakeholders (as agreed) to inform design process. See detail in section 4. - Include detail of the likely management and maintenance requirements post construction to ensure sustainability and longevity of the constructed wetland. To include description, scale and optimal frequency of necessary ongoing maintenance activities where relevant. For more information about this opportunity, please visit the Delta eSourcing portal at: [delta-esourcing.com](https://www.delta-esourcing.com/tenders/UK-UK-Watford:-River-regulation-and-flood-control-works./BQW35F353G) To respond to this opportunity, please click here: [delta-esourcing.com/respond/BQW35F353G](https://www.delta-esourcing.com/respond/BQW35F353G) Read full description ## CPV classification River regulation and flood control works Riverbank protection works Feasibility study, advisory service, analysis Source Find a Tender (UK) · Notice ocds-h6vhtk-0589a1-2025-08-18T12:05:06+01:00 [View official notice](https://www.find-tender.service.gov.uk/Notice/ocds-h6vhtk-0589a1-2025-08-18T12:05:06+01:00) Never miss a tender like this again Get AI summaries, deadline alerts and a bid pipeline for tenders matched to your business. Free to start. 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