Short-term rehabilitation planning of water distribution networks

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Short-term rehabilitation planning of water
distribution networks
BRNO UNIVERSITY OF TECHNOLOGY Faculty of Civil
Engineering Institute of Municipal Water
Management BRNO, Czech Republic

• Tomáš Kucera
• Ladislav Tuhovcák

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Water pipes in Czech Republic

• 64.500 km water mains in the CR
• about 800 km per year should be rehabilitated
• questions
• What approach to reconstruction is the most
  suitable?
• What technology should be used?

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Rehabilitation Planning

• terms
• long (15-20 years)
• middle (3-5 years)
• short (annual)

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Annual Rehabilitation Planning

• main goal
• propose some pipes for rehabilitation
• questions
• where?
• when?
• how?
• cost?

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Planning diagram
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Steps of annual rehab planning

1. Basic elements

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The basic elements

• hydraulic sections
• not favourable
• often too short
• entities
• several hydraulic sections with the same
  parameters
• diameter
• material
• installation year
• system of streets
• pattern of development
• map of valves

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Steps of annual rehab planning

1. Obtaining of basis data

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The basis data

• town planning scheme
• Water-supply topology, mathematic model
• regulations for water supply operation
• long and middle term rehab plan
• operation documentation
• failures
• leakages
• television inspection survey
• analysis of water quality
• co-ordinations

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Steps of annual rehab planning

1. Criteria

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The set of criteria by CARE-W1. Internal

• Annual Repair Cost
• Water Losses Index

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The set of criteria by CARE-W2. External

• Water Interruptions
• Predicted Water Interruption
• Predicted Critical Water Interruption
• Predicted Frequency of Water Interruption
• Damage and disruptions
• Damage due to Flooding in Housing area
• Damage due to Flooding in Industrial or
  commercial areas
• Damages due to Soil Movement
• Traffic Disruption
• Damages and/or Disruption on other Infrastructure
• Water Quality Deficiencies
• Hydraulic Deficiencies

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The set of criteria by CARE-W3. Other

• Co-ordination
• with other utilities and roadway rehabilitation
  programmes
• with service connection replacement programmes

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The simple set of criteria
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Steps of annual rehab planning

1. Selecting of entities

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Multi-criteria assessment

• selecting a set of some elements (pipe-sections,
  entities) for rehabilitation
• sorting procedure
• the method of average weighting
• gt sort list
• ranking procedure
• the Electre methods
• gt categories
• CARE-W_ARP (INSA Lyon)

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Steps of annual rehab planning

1. Rehab technologies

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Database of the rehab technologies

• the selection of the right rehab technology for
  the sorted elements
• rehab technologies for water mains
• open-trench
• trenchless
• evaluation of every technology by criteria

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Database of the rehab technologies

• applicability
• costs
• influence on
• environment
• pipe material
• water quality
• hydraulic properties
• supplemental information
• maximum length of pipe-section
• realisation time
• armature removing

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Decision support for the Annual Planning

1. CARE-W_ARP

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Priorities of operator BVKWeight of criteria

Co-ordination Score 30
Annual Repair Cost 20
Traffic Disruption 14
Year of laid 10
Predicted Critical Water Interruption 8
Predicted Water Interruption 6
Predicted Frequency of Water Interruption 6
Damage due to Flooding in Housing area 6
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Annual Rehab Plan for Sub-zone
by CARE-W_ARP
by BVK (operator)
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Decision support for the Annual Planning

1. NetPlan_A

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NetPlan_A

• Knowledge basis
• Data
• Input
• Criteria
• Pipe materials
• Rehab technologies

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NetPlan_A

• Task
• Data evaluating
• Sector value
• Criteria calculation
• Entities assortment
• Technology proposition

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Conclusions

• main goal
• to create a comprehensive support for annual
  rehab planning, which will be applicable in the
  conditions of the Czech Republic

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Thank you for your attention
Tomáš Kucera kucera.t_at_fce.vutbr.cz

• Brno University of Technology
• http//water.fce.vutbr.cz