Hydraulic Modelling and Risk Mapping

Statement of Requirements and Outline Brief
Template

Technical Group

1.Introduction

Project title / Red House Gill - Phase 1
Project reference
Project stage / Phase 1
Environment Agency Region / Yorkshire & North East Region
Environment Agency Area / Northumbria Area
Environment Agency Project Manager / Rory Hunter
Environment Agency Project Executive / Jamie Fletcher
Project Partner(s)
Contact details for Environment Agency Project Manager / Tyneside House, Skinnerburn Road, Newcastle
0191 203 4201

2.Health & Safety and environmental considerations

The Environment Agency has a statutory duty to ensure that the employees and consultants it employs are competent in the tasks they perform with regard to health, safety, wellbeing and environmental responsibilities. Compliance with Health and Safety legislation was addressed when the SFRM2 framework was tendered for and general requirements for Health and Safety (such as working hours, site visit risk assessments, etc) are covered by this.

3.Description of requirements

Objectives
Redhouse Gill is a small tributary of the River Wear near Brasside in CountyDurham. The Gill flows through a deeply incised valley, the geology of which is primarily composed of soft sands and clays. In recent years the Gill has been subjected to a number of high flow events which have resulted in severe erosion of the surrounding substrata and extensive bank slips. There has long been concern from the angling community about the source and impacts of this sediment deposition in the Redhouse Gill and downstream of the confluence with the River Wear. Invertebrate biology of Redhouse Gill has been shown to be poorer than would be expected and a qualitative assessment indicated that the silt plume was likely to affect both fish behaviour and fishing quality.
Previous studies, and anecdotal evidence from the angling club, have suggested that surface run-off from the Arnison centre, urban areas of Brasside and the remand centre could all be contributing to the accelerated rates of erosion seen in the Redhouse Gill system. Evidence from previous walkover surveys has also suggested that high rainfall events, not always associated with drainage from adjacent urban areas, could be contributing to erosion problems in the system.
This project overall willgather information and data regarding:
  • hydrology of the watercourses;
  • levels of sediment (suspended solids) movement associated with overland flow;
  • rainfall data for the contributing area;
  • drainage infrastructure; and
  • review existing evidence to determine probable causes of erosion.
A compilation and analysis of this data will provide a means of understanding the mechanisms driving the transportation of silt through the Redhouse Gill system and in order to determine priority mitigation measures.
The element of the overall project to be addressed under this particular agreement would be a land drainage desk study – the collation and review of data on the land drainage network in the area, ownership of drains and capacity of drains. This wouldinclude both private and water company owned sewers. Work may include a certain amount of modelling to determine the capacity of the sewers. In particular this work should link to existing local authority plans for future development of the Arnison centre and other adjacent areas.
A specific flow gauging survey at the Arnison Centre surface water outfall would also provide data to support further investigations planned for the area. Ownership of the structure will need to be ascertained and permission established for any monitoring equipment that is deployed.
Depending on the outputs of the initial study, more detailed modelling of the drainage infrastructure may be a further option to link in with the flow data recorded within the watercourse network.
Study area
Maps showing the geographic location of the study area are included in Appendix A.
The Red House Gill (and its 2 tributaries ) are small tributaries of the River Wear situated to the north of DurhamCity. The confluence with the River Wear is located at NGR NZ 28591 44539
Deliverables
The draft and final reports of the project must follow the SFRM performance scope available from
An understanding of the contribution to the watercourses from local public and private surface water sewers – including volumes/rates’discharge locations.;
Flow gauging data from the Arnison centre surface water outfall.
Activities
  • project management;
  • preparation of outline proposal;
  • agree proposal;
  • frequency of reportingand regular progress meetings /verbal updates;
  • familiarisation of site - full walkover of the study area;
  • procurement of additional survey information required, in accordance with national survey specification and standard contracts;
  • check that existing and new survey data fit together;
  • preparation of suitable hydrology;
  • obtain relevant historic flood information;
  • appropriate consultation with Environment Agency staff and partners
  • calibration of hydrological and hydraulic models and analysis of data against available information;
  • production of draft report;
  • quality assurance of all deliverables;
  • review of draft report and deliverables by Environment Agency;
  • production of final report;
  • post project appraisal.
  • establish ownership of the Arnison Centre surface water outfall and permission to deploy/use any flow monitoring equipment.

4.Data

Data available
  • 2010 EA Invertebrate survey
  • 2009 Geomorphology report
  • 2009 EA Invertebrate & Fisheries survey

Data management plan
The consultant project manager should produce a data management plan (with support from the Environment Agency project manager) for this study to scope the data needs for the project, the resources required for data acquisition, and cost savings which could be made by cooperating with other teams or partners on projects. The current national Environment Agency template should be used (available from operational instruction 183_05 which can be provided by the Environment Agency project manager) and supplemented by additional local requirements if necessary.
Intellectual property
There are clauses in the Contract Data Template (Option X9 and Option Clause Z4) related to IPR which help us ensure we manage Intellectual Property properly.
The Environment Agency would expect to take ownership of the IPR upon completion of the work.
Data security
Special data such as model files and survey data should be supplied in an encrypted zip file with the password supplied independently
Licensing
Any data supplied to the consultant as part of this study will be done so in accordance with Environment Agency policy, and appropriate data licences. Any other data requested by the consultant will be provided and licensed for the duration of the study.
Metadata
Any new data or information that is created as part of a commission must be submitted to the Environment Agency with associated metadata.

5.Project management

Outline budget
Approximate maximum budget of £10,000 for all aspects of Phase 1 work.
Outline programme
  • Money must be spent by the end off the financial year 2011-2012
  • Draft work programme to be agreed and return bid 27th Jan (Earlier if possible)
  • EA internal procurement approval 10th Feb and formal start
  • Draft report submission 29 Feb
  • Final report 13 March

Pricing Option- NEC3 Professional Services Contract (PSC)
Option A: Priced contract with activity schedule
Contract strategy
  • JBA Consulting appointed by direct allocation

Tender return information
Rory Hunter, Environment Agency, Tyneside House, Skinnerburn Road, Newcastle NE4 7AR
External contributions
N/A

6.Consultant’s response

The consultant must provide the following:
A technical proposal
Work programme
Detailed price schedule
The proposal should consist of the following information:
Key project personnel
Describe the key people to be used in the project and their roles.
  • Organisation and roles
To include organisation and governance of the project team and locations / logistics.
  • Technical experience, qualifications and experience
To include qualifications, relevant experience, technical quality and communications (reporting and consultation with the Environment Agency and partners).
The consultant should provide CVs of key project staff including the Project Manager as an appendix to their proposaland should not exceed 2 sides of A4 paper per person / CV.
Programme, risks, resources and contingency
Refer to ‘Appendix 13: Contract Options and Risk – keeping it simple’ (available from ) for guidance.
Method and approach
  • Demonstrate an understanding of the aims and objectives of the study;
  • Evaluate most appropriate methods and techniques to achieve desired outcomes;
  • Identify aspects considered to be of key importance to the study and how any challenges might be addressed;
  • Make an initial assessment of data available and identify any high level data quality or availability issues and how these might be addressed;
  • Make an initial review and discussion of the findings;
  • Include brief resume of similar projects where the consultant has delivered successfully;
  • Consider appropriate quality assurance procedures to test and document the product’s suitability for its intended purpose.

Innovation and value added
  • Demonstrate any added value and/or innovative techniques provided within the project to reduce costs or increase efficiency. Additional services at additional cost to the project do not provide added value.

7.Evaluation of consultant proposal

Assessment criteria
The Environment Agency Project Manager and Procurement Officer will evaluate the consultants’ proposals. The scores will be weighted in the following way:
Quality 50% comprising:
1) Key Project Personnel
2) Programme, risks, resources and contingency
3) Method and approach
4) Innovation and value added
Price 50% comprising:
The total priced contract for carrying out the services in this assignment including the estimate of consultant owned risk.
Survey costs to be included and assessed within contract value.

8.Attachments

Attachments
  • Appendix A – Map(s) showing the study area;

Appendix A: Maps showing the study area

Created by EA task groupPage 1 of 6Last updated 18-Apr-19

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