CONSULTANT BRIEF FOR THE GENERIC CREEK FLOOD STUDY
GENERIC CITY COUNCIL
NOTE: DECC needs to amend green shaded text before the Generic Brief is finalised and put out to tender (see bottom of this page and Section 5.1)
CONSULTANT BRIEF FOR:
GENERIC CREEK FLOOD STUDY
CONSULTANT BRIEF FOR THE GENERIC CREEK FLOOD STUDY
IN TWO (2) PARTS:
PART A: OBJECTIVES, REQUIRED SERVICES, DELIVERABLES and RELEVANT INFORMATION
PART B: LODGEMENT of PROPOSALS, PROJECT MANAGEMENT and CONDITIONS of ENGAGEMENT
NOTE: This Brief is based on DECC's Generic Flood Study Brief. Text shaded “grey” is “standard” text that was last amended on 11 September, 2007 and is current at **INSERT DATE BRIEF GOES TO TENDER**.
September 07
CONSULTANT BRIEF FOR THE GENERIC CREEK FLOOD STUDY
Note:
Council should amend this document (text shaded “turquoise” or “yellow”) as appropriate to their requirements and/or to included local information. Text in “grey” shaded sections is password protected and cannot be readily changed. If Council wishes to change protected text it should contact the Department of Environment and Climate Change’s (DECC) representative to discuss the reasons for requiring the change.
CONSULTANT BRIEF FOR THE GENERIC CREEK FLOOD STUDY
TABLE of CONTENTS
PART A: OBJECTIVES, REQUIRED SERVICES, DELIVERABLES & RELEVANT INFORMATION 2
A1. INTRODUCTION 2
A2. BACKGROUND and STUDY AREA 3
A3. OBJECTIVES 4
A4. DELIVERABLES 4
A4.1 General 4
A4.2 Key Project Stages 4
A4.3 Progress Reports 5
A4.4 Draft and Final Reports 6
A4.5 Survey Data 7
A4.6 Hydrological, Hydraulic and Flood Damage Modelling and Results 7
A4.7 Geographic Information System (GIS) Files 7
A4.8 Format of Deliverables 8
A5. AVAILABLE INFORMATION and REFERENCES 8
A6. SCOPE OF WORK 9
A6.1 Collect, Compile and Review of Available Information 9
A6.2 Consultation 9
A6.3 Topographical Survey 10
A6.4 Acquisition of Additional Data 11
A6.5 Hydrology 11
A6.6 Hydraulic Modelling 12
A6.7 Model Calibration and Validation 13
A6.8 Modelling of Design Events for Existing Conditions 13
A6.9 Model Parameter Sensitivity and Checks with Alternative Methods 14
A6.10 Hydraulic and Provisional Hazard Categorisation 14
A6.11 Flood Damage Assessment 15
A6.12 Hand-over of the Study Materials 15
A7. Meetings 16
A8. HOLD POINTS 17
Figure A1 – LocaLity Plan 18
figure A2 – Study Area 19
Figure A3 – Typical File structure 20
PART B - LODGEMENT of PROPOSALS, PROJECT MANAGEMENT & CONDITIONS of ENGAGEMENT 21
B1. CONDITIONS OF ENGAGEMENT 21
B2. CONDITIONS FOR SUBMISSION OF PROPOSAL 21
B2.1 Council Contact Officer 21
B2.2 Completion of Proposal 22
B2.3 Lodgement of Proposal 22
B2.4 Alternative Proposals 22
B2.5 Assessment/Acceptance of Proposals 23
B2.6 Acceptable Legal Entities 23
B2.7 Outline Plan 24
B3. SUPPLEMENTARY CONDITIONS 24
B3.1 Consultant Management of the Study 24
B3.2 Expert Witness 25
B3.3 Variations 25
B3.4 The Study Budget 25
B3.5 Standards 26
B3.6 Consultant Performance 26
B3.7 Study Duration 26
B3.8 Suspension of Flood Study 27
B4. COUNCIL’S AUTHORISED REPRESENTATIVE 27
ATTACHMENT A FEE PROPOSAL FORM (MANDATORY) 28
ATTACHMENT B HOURLY RATES FOR STUDY TEAM (MANDATORY) 29
ATTACHMENT C COST SCHEDULE (MANDATORY) 30
ATTACHMENT D CONSULTANCY AGREEMENT 31
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CONSULTANT BRIEF FOR THE GENERIC CREEK FLOOD STUDY
PART A: OBJECTIVES, REQUIRED SERVICES, DELIVERABLES & RELEVANT INFORMATION
A1. INTRODUCTION
The primary objective of the New South Wales Government’s Flood Prone Land Policy is to reduce the impact of flooding and flood liability on individual owners and occupiers of flood prone property, and to reduce private and public losses resulting from floods, utilising ecologically positive methods wherever possible.
Through the Department of Environment and Climate Change (DECC) the Department of Planning (DoP) and the State Emergency Service (SES), the NSW Government provides specialist technical assistance to local government on all flooding and land use planning matters. The Floodplain Development Manual (NSW Government, 2005) is provided to assist councils to meet their obligations through the preparation of floodplain risk management plans. The following Figure 2.1 from the Manual documents the process for plan preparation, implementation and review.
Floodplain Risk Management CommitteeSection 2.2
Appendix D / Established by the local council, must include community groups and state agency specialists
Data Collection
Section 2.3
Appendix E / è / Flood
Study
Section 2.4
Appendix F / è / Floodplain Risk Management Study
Section 2.5
Appendix G / è / Floodplain Risk Management
Plan
Sections 2.6 and 2.7
Appendix H / è / Plan
Implementation
Sections 2.8 and 2.9
Appendix I
ç / ç / ç / ç / ç / ç / ç
Compilation of existing data and collection of additional data. Usually undertaken by consultants appointed by council. / Defines the nature and extent of the flood problem, in technical rather than map form. Usually undertaken by consultants appointed by council. / Determines options in consideration of social, ecological and economic factors relating to flood risk. Usually undertaken by consultants appointed by council. / Preferred options publicly exhibited and subject to revision in light of responses. Formally approved by council after public exhibition and any necessary revisions due to public comments. / Implementation of flood, response and property modification measures (including mitigation works, planning controls, flood warnings, flood readiness and response plans, environmental rehabilitation, ongoing data collection and monitoring) by council.
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Generic City Council is responsible for local land use planning in the Generic Creek catchment including that land on the floodplain of the drainage system.
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Through its Floodplain Risk Management Committee the Council proposes to prepare a comprehensive floodplain risk management plan for the study area in accordance with the NSW Government’s “Floodplain Development Manual: the management of flood liable land”, April 2005 (The Manual). This brief relates to the flood study phase of the process.
A2. BACKGROUND and STUDY AREA
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Geurie (population approx %%%%) is located approximately 400 km north west of Sydney, between Wellington and Dubbo in the Central West of NSW (Figure 1) The town has a history of both mainstream and overland flooding and there is a need to define the extent of flooding and to determine appropriate development controls and risk management plans.
Three drainage systems called the Boori, Geurie and Limestone Creeks all converge at the village of Geurie. They all form in farmland areas on higher uphill slopes to the north and east of Geurie then flow through the village before joining into the Macquarie River (Figure 2) The combined catchment area is approximately 60 km2.
Geurie has been a traditional farming community with local flood knowledge guiding sensible development patterns and restricting development on the flood liable parts of the village. Unfortunately though, in recent years, the number of people with this generational knowledge base is decreasing.
This loss coupled with more development pressure due to the recent State Government announcement to build a Correctional Services facility at Wellington and the proximity of Geurie to Dubbo means that the likelihood of inappropriate development in flood liable areas is increased.
Wellington Council is reviewing the Geurie Development Control Plan and it is proposed to integrate the results of this Flood Study into that plan to reduce flood risk.
The village has experienced several flood events with Geurie and Limestone Creeks causing flooding of the lower lying areas around Tom Culkin oval in the 1950’s. Around this time a series of contour banks were constructed on the lower slopes of Geurie Bald Hill to divert floodwater away from the village; the effect of these structures needs to be considered when assessing the full range of flood events in this study.
In recent years some houses in the village have experienced flooding due to overland flows from catchment areas outside the village boundary. The areas affected are indicated on There is opportunity to mitigate the effect of flood events as the village expands into the Rural Residential Zone 1(c) areas to the west; the subsequent Floodplain Risk Management Study would explore such options.
The study area and the area for which detailed, reliable information on flooding is required is shown on Figure 2. Also shown on Figure 2 are the watercourses to be specifically modelled and the areas for which there is some anecdotal indication of flooding problems due to local overland flow.
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A3. OBJECTIVES
The primary objective of the study is to define the flood behaviour under historical and existing conditions in the Study Area (Figure A2). Subject to budget constraints it is also desired to quantify the flood damages that would occur under current floodplain conditions. The study will produce information on flood levels, velocities, flows, hydraulic categories, provisional hazard categories and flood damages for under historical and existing conditions a full range of design flood events under existing catchment and floodplain conditions. To achieve this objective the consultant is expected to collect, compile and review all available relevant data (including survey, aerial photography and satellite imagery
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CONSULTANT BRIEF FOR THE GENERIC CREEK FLOOD STUDY
The design events of interest shall include the Probable Maximum Flood (PMF) event or another specified extreme flood event (see Section A6.8), the 0.5%, 1%, 2%, 10% AEP and 5 year ARI events.
Only mainstream flooding/Local Overland Flow flooding/tidal inundation (or any combination.)- AMEND AS APPROPRIATE – is to be investigated.
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It is expected that hydrologic and hydraulic modelling will be required to satisfy the study objectives (see also Sections A6.5 and A6.6). The models and results produced in this study are intended to also form the basis for a subsequent floodplain risk management study where detailed assessment of flood mitigation options and floodplain risk management measures will be undertaken. Therefore the models established in the flood study must be suitable for use to assess a range of management options in the floodplain risk management study.
A3.1 Specific Objectives for the Study Area
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CONSULTANT BRIEF FOR THE GENERIC CREEK FLOOD STUDY
Are there any specific objectives/issues for the study area that need to be investigated (locations where flooding is a particular problem, obstructions within the waterway/floodway or on the floodplain etc – Refer to Section A3.1 of “Guidelines For The Preparation Of A Consultant Brief For A Flood Study”)?. Provide details and if appropriate, indicate location on Figure A2.
Any emergency management issues such as information on when evacuation/access roads get cut?
If there are no specific objectives for the study area enter “Nil”.
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A4. DELIVERABLES
A4.1 General
The deliverables specified in Section A4 are to be provided as a minium from this study. Handover of these deliverables is specified in Section A6.12.
A4.2 Key Project Stages
A4.2.1 General Requirements
Key project stages for reporting and the making of progress payments shall be:
Stage 1. Completion of Data Collection and Assessment and Community Consultation Report
Stage 2. Completion of Model Calibration and Validation Report
Stage 3. Completion of Modelling and Flood Damages Assessment
Stage 4. Draft Flood Study Report
Stage 5. Final Flood Study Report
Stage 6. Completion of Contract
All reports including all diagrams, figures and inserts, are to be provided in hardcopy form plus an electronic copy compatible with the word processing software outlined in Section A4.8. Electronic model output files for all design runs and scenarios are also to be provided as waterRIDETM files or raw results suitable for translation into waterRIDETM - see DECC's Guideline “Model Reporting & Supporting Information (including Model Files) for Review” for requirements.
A4.2.2 Specific Requirements
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Additional key project stages are to be added where required to Section A4.2.1 above.
If there are no additional key project stages enter “NIL”.
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A4.3 Progress Reports
A4.3.1 General Requirements
Upon acceptance of their proposal, the Consultant shall provide a final draft of the program and timetable of major tasks for completion of the study, together with estimated monthly expenditure. The program shall be in a form suitable for updating to show the status of the technical work, timing and expenditure during the course of the study.
The Consultant shall submit brief monthly progress reports to the Council outlining progress on the technical work, together with an updated program showing the status of project completion, timing and budget. Any issues that may affect the timely and efficient completion of the study shall be identified in the progress reports.
More detailed progress reports are required at Stages 1 to 3 as indicated in Section A4.2.
Sufficient information shall be provided to enable the Council to review the progress of the study. The progress reports may include draft versions of the relevant sections of the final report, where appropriate. Where progress reports relate to the study stages identified in Section A4.2.1 above and are to be discussed at a meeting of the Committee or Council, the reports are to be submitted no later than 7 days (5 working days) prior the date of the relevant meeting.
Whenever possible, progress and draft reports are to be submitted electronically in the word processor format outlined in Section A4.8.