National Urban Waste Water Study (Covers catchments with a population equivalent of 2,000 or more...
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![Page 1: National Urban Waste Water Study (Covers catchments with a population equivalent of 2,000 or more outside the Greater Dublin Area) Department of the Environment,](https://reader030.fdocuments.in/reader030/viewer/2022032800/56649d4a5503460f94a27a61/html5/thumbnails/1.jpg)
National Urban Waste Water Study
(Covers catchments with a population equivalent of 2,000 or more outside the Greater Dublin Area)
Department of the Environment, Heritage and Local Government National Urban Waste Water Study
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Objectives & Deliverables
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Study Objectives
Capture and analyse all readily available data
Assess scheme capacities & future shortfalls / excesses
Identify future network investigation needs and costs
Assess management and maintenance practices
Make recommendations for targeting investment & monitoring performance
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Specific Deliverables
National Report plus Executive Summary
County Reports (26) including 170 individual Catchment Reports
Assessment Methodologies
Development Guidelines
Database and Geographic Information System
Cost estimates for future network survey & analysis
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Project Management
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Team Structure
Joint Venture
Region 1E G Pettit
Region 2J B Barry
Region 3 White Young Green
Babtie Project Management
Peer Review Group
SteeringCommittee
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Regional Management
Barry & Partners
White Young Green
Pettit & Company
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Nov 01- Apr 02: Pilot study to test questionnaire approach
May 02 – Oct 02: Questionnaire survey
Nov 02 – Apr 03: Draft the catchment reports
May 03– Nov 03: Validate & finalise catchment reports
Dec 03 – Apr 04: Draft the county & national reports
Programme of Work
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Data Management
Data collection questionnaires issued to each county
Data collection team visited county staff & treatment plant
Questionnaires populated 200,000 cell database
Analysis presented in 170 catchment reports
County/catchment reports: 20,000 key output numbers
National report: 200 key output numbers
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Questionnaires reviewed by JV with LA staff at the time the
data was compiled
Key values checked against industry average values or
standard estimates
JV quality management procedures applied
Reports reviewed by LA staff and/or DEHLG
Comments considered by JV teams - reports amended as
necessary & finalised
Audit & Verification Process
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High level of commitment to NUWWS by LA staff
LA operator knowledge of unrecorded assets
Web sites for environmental & population data
Detailed verification by LAs & DEHLG
Key Success Factors
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Report Structure
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Executive Summary
1 Introduction
2 Methodology
3 Findings (7 items)
4 Recommendations (10 items)
(10 page document complete with CD Rom of whole report)
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National Report
1 Introduction
2 Method of Approach
3 The Catchments
4 Environmental Factors
5 Sewerage System
6 Waste Water Treatment
7 Sludge Disposal
8 Database & GIS
9 Guidelines
10 Cost Estimates
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Appendices
A Method of Approach
Questionnaires, Network statistics
Flow & load assessment
Receiving waters & treatment plant capacity
Network survey requirements
B Database & GIS
User manual – a guide to accessing & updating information
C Development Guidelines
Asset inventory & valuation
Investment prioritisation
Network rehabilitation practices
D Cost Estimates
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County Reports
1 Introduction
2 Methodology
3 Catchment Report Summaries
Appendices
The Brief
Catchment Reports
1 The Catchment
2 Environment Factors
3 Sewerage System
4 Waste Water Treatment
5 Sludge Treatment
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Catchment Reports
1 The Catchments
Areas, planning targets & population projections
2 Environmental Factors
Receiving water characteristics, flows & loads
3 Sewerage System
Asset inventory & network integrity audit
Operational management
Surveys & investigations, performance & capacity
4 Waste Water Treatment
Process & inventory, condition performance & capacity
Operational management, Upgrading requirements
5 Sludge Disposal
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Report figures: network layout
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Report figures: Treatment works
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Data Deficiencies(Assessed from data collection exercise)
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Flow & load assessed for the following sectors:- Domestic- Industrial
- Commercial
Wastewater Flow and Load
- Institutional
- Tourism
Domestic population figures frequently open to question
Non-domestic flow & load data frequently incomplete
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Up to date network plans frequently not available
Combined sewer overflow records suggest there may be many unlisted overflows
Little reliable data on overall structural condition
Almost no information on frequency of storm events causing flooding
Sewerage System
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Monitoring of effluent load frequently did not conform to statutory requirements
Flow & load records frequently of limited value as they did not identify dry weather flow periods
Water quality & stream flow data not available for all sites
Treatment Plant
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Some National Findings
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Sewerage Network Assets
Finding One
Little detailed knowledge for some 40% of networks
40% of networks have no recorded overflows !
Indicative network quantities :
- 5,900km of Sewers & Rising Mains
- 480 Combined Sewer Overflows
- 640 Pump Stations
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Performance of Network
89% of networks reported one or more failures as below
Frequency of failures not commonly known !
- 17% of catchments reported property flooding
- 72% of catchments reported flooding of environs
- 42% of catchments reported structural failures
- 56% of catchments reported watercourse pollution
Finding Two
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Receiving Waters
Assimilative capacity of 111 receiving water assessed
86% of receiving waters found to have restricted capacity
- 76% due to Phosphate levels
- 29% due to BOD levels
Finding Three
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Some Recommendations
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Update the network records & plans
Confirm condition of networks & ancillaries
Monitor/record network performance/incidents
Understand Sewer Network
Recommendation One
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Upgrade sampling of treatment plant effluents
Locate all combined sewer overflows
Install monitoring devices on key overflows
Receiving Waters – Quality Monitoring
Recommendation Two
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Compile & maintain accurate asset records
Understand the condition of the core assets
Compile & maintain reliable performance data
Key Issues:
Summary
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Thank you allIan Aikman
Project Manager
End of storey so far……
Department of the Environment, Heritage and Local Government National Urban Waste Water Study
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Footnote
As of 12 August, Babtie Group became part of the Jacobs group of companies and is now known as Jacobs Babtie