WSNTG 9th Annual Conference

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WSNTG 9th Annual Conference

• Water Services Strategic Plans
• Fact or Fiction

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National Urban Waste Water Study

• Ian Aikman Terry Kennedy
• Project Manager Assistant PM

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National Urban Wastewater Study

• NUWWS commenced in late 2001
• Initiative driven by national legislation
  development pressure
• Need to increase quality of wastewater design
  data

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Study Objectives

• Compile asset inventory, database GIS
• Assess networks deficiencies, records upgrading
  investigation needs
• Assess WwTW capacity to treat / discharge
  wastewater in compliance with standards and
  legislation outline upgrading proposals
• National guidelines and criteria for performance
  monitoring and investment prioritisation

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Study Scope

• Wastewater network catchments gt2,000 p.e.
• 170 No. analysed across country, outside Dublin
  Region
• Area covering 70,000km2
• Over 2 years

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The Project Team
Joint Venture
Peer Review Group
Steering Committee
Babtie Project Management
Region 1 E G Pettit
Region 2 J B Barry
Region 3 White Young Green
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RegionalManagement

Dublin Region covered by GDSDS
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Methodology
Catchment Pilot Study
Pilot Study Data Inputs 6 No. Schemes
Pilot Study
Field Data Collection
Data Inputs 170 No. Schemes
Data Collection
Catchment Assessment
Sub-Studies
Data Analysis
Validate Catchment Data
Validation
Reporting
Final Reports
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Pilot Study

• Driven by Steering Committee from Inception
  Stage
• To define and refine data collection process
• To provide live data for initial analysis
  processing

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Pilot Study

• Geographical spread of catchments in 3 regions
• Range in size and nature
• Previous catchment history within consortium

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Pilot Study

• Catchment characteristics
• Environment receiving waters capacity

Receiving Waters
WwTW
Castletroy
PStn

• Network review assessment
• Network asset data relationships for sub-study
  models

Trunk sewers
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Pilot Study
Castletroy WwTW

• Populations, flows loads
• Treatment process review

Ballincollig WwTW

• Impact on receiving waters
• Sludge handling disposal

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Pilot Study Outcomes

• Questionnaire formats
• Database GIS structure
• WwTW survey protocols
• Data sets for sub-study models
• Data collection schedule for main study

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Data Collection Process
1. Questionnaires

• Sewerage network
• Treatment flow load
• Treatment processes
• Receiving water quality

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Data Collection Process
2. WwTW Surveys
WwTW Layout
Birr WwTW, Co. Offaly

• Asset surveys
• Process flow assessment

• Sampling / monitoring
• Performance review

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Data Analysis

• Questionnaires reviewed
• Data downloaded to database
• Analysis of available data sets
• Sub-study models applied
• Existing and future scheme capacity
• Records upgrading needs

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Validation

• Stakeholder review of catchment data
• Feedback final data refinement
• Validation of draft reports by L.A. staff
• Data sets frozen (2002)

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Reporting ExampleBirr, Co. Offaly

• 1 The Catchments
• Areas, planning targets population projection
• 2 Environment
• 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
• Asset condition, performance capacity
• Operational management
• Upgrading requirements
• 5 Sludge Disposal

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Birr Catchment Report Plans
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Birr Catchment Report Findings
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Database GIS

• Example Killarney, Co. Kerry
• Data storage
• Geographical representation
• Linkage from GIS to database

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Data Reporting Sequence
NUWWS Database
GIS Inputs
Inputs from 4 catchment questionnaires surveys
Output catchment reports
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Reporting Hierarchy
170 Catchment Reports
1 National Report
26 County Reports
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National Study Findings
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Populations

• Population redistribution
• Majority catchments sampled ? p.e. lt 5,000
• Overall population increase of 36 between 2002
  (1.2M) to 2022 (1.6M)

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Catchment Size Load
Catchment p.e. lt 2,000
Catchment p.e. 2,000-10,000
Catchment p.e. 10,000-15,000
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Catchment p.e. gt 15,000
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19
17
8
10
74
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Catchment size distribution
Catchment loading distribution by size
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Network Inventory Performance
NUWWS Network Inventory
NUWWS Network Performance Summary
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Conclusions - Networks

• Lack of network data
• NUWWS inventory estimated from small sample data
  set
• Uncertainty on CSO numbers and location
• Anecdotal incident data
• Frequency of incidents not commonly known !

Bandon Network
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WwTW Inventory Performance
NUWWS WwTW Inventory
NUWWS WwTW Performance Summary
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Conclusions - Treatment Works

• Majority WwTW reported as operating
  satisfactorily (2002)
• Flow and load monitoring limited and variable!
• OM data variable, practices changing - DBO
  approach PMS
• 44,000 tonnes dry solid sludge per annum
  sludge management plans
• UWWTD Directive upgrading ongoing

Rathkeale WwTW
Ardee WwTW
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Receiving Waters Assessment
Receiving Water Types
Receiving Water Assimilative Capacity Constraints
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Conclusions - Receiving Waters

• Assimilative capacity of 105 (of 170) receiving
  waters assessed
• 40 of discharges to sensitive waters
• 86 of receiving waters found to have restricted
  capacity
• Lack of WQ data on receiving waters limited
  assessments

Bandon WwTW River Bandon
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General Conclusions

• Inventory database building block for future
  AMPs
• Need for national guidance and standards on-
• Asset condition assessment and valuation
• Economic criteria for sewer investigation and
  survey planning
• Minimum levels of service (trigger levels)
  performance measures
• Comparative evaluation of projects using
  standard cost data/indices
• Records upgrading essential to future
  rehabilitation planning-
• 17M survey work to identify future network
  upgrading needs
• Additional 9M survey work to maintain develop
  sewerage networks

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NUWWS Recommendations

• Compile maintain accurate asset records
• Survey / update network records plans
• Locate all combined sewer overflows
• Update treatment plant records as necessary
• Develop from the NUWWS - Integrate with CiS
  development?
• Understand the condition of the core assets
• Identify the core area of the network
• Intermittently re-assess the condition of the
  core assets
• Compile maintain reliable performance data
• Monitor / record network performance incidents
• Use computer models to assess network capacity
• Upgrade monitoring / sampling of treatment plant
  effluents

preparing industry for the next steps
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The Next Steps

• Water Services Bill Implementation
• Strategic Plans

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Key points from the Bill (Cl. 36)

• Objectives Water service strategic plan are to
• protect human health the environment
• facilitate the provision of sufficient water
  services
• support proper planning sustainable
  development
• Strategic Plan to include information on
• monitoring arrangements
• asset management planning

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Asset Management Planning

• Define the rules objectives, standards,
  policies
• Identify assess the current assets
• Determine the asset life value
• Assess the rehabilitation requirements
• Develop optimum whole life solutions
• Prioritise the work implement the programme

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WSNTG 9th Annual Conference

• Water Services Strategic Plans
• Fact or Fiction