Short-term rehabilitation planning of water distribution networks Tomáš Kučera

Short-term rehabilitation planning of water distribution networks

• Tomáš Kučera

• Ladislav Tuhovčák

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?

Rehabilitation Planning

• terms

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

Annual Rehabilitation Planning

• main goal

• propose some pipes for rehabilitation

• questions

• where?
• when?
• how?
• cost?

Planning diagram

Steps of annual rehab planning

• Basic elements

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

Steps of annual rehab planning

• Obtaining of basis data

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

Steps of annual rehab planning

• Criteria

The set of criteria by CARE-W 1. Internal

• Annual Repair Cost

• Water Losses Index

The set of criteria by CARE-W 2. 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

The set of criteria by CARE-W 3. Other

• Co-ordination

• with other utilities and roadway rehabilitation programmes
• with service connection replacement programmes

The simple set of criteria

Steps of annual rehab planning

• Selecting of entities

Multi-criteria assessment

• selecting a set of some elements (pipe-sections, entities) for rehabilitation

• sorting procedure

• the method of average weighting
• => sort list

• ranking procedure

• the Electre methods
• => categories
• CARE-W_ARP (INSA Lyon)

Steps of annual rehab planning

• Rehab technologies

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

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

Decision support for the Annual Planning

• CARE-W_ARP

Priorities of operator „BVK“ Weight of criteria [%]

Annual Rehab Plan for Sub-zone

Decision support for the Annual Planning

• NetPlan_A

NetPlan_A

• Knowledge basis

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

NetPlan_A

• Task

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

Conclusions

• main goal:

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

• Brno University of Technology

• http://water.fce.vutbr.cz