Short-term rehabilitation planning of water distribution networks Tomáš Kučera Ladislav...

Short-term rehabilitation planning of water distribution networks

Tomáš KučeraLadislav Tuhovčák

BRNO UNIVERSITY OF TECHNOLOGYFaculty of Civil EngineeringInstitute of Municipal Water Management

BRNO, Czech Republic

http://water.fce.vutbr.cz 2/27

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

2. 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

3. 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

basic parameters importanceexternal

parameterstechnical condition

DNnumber of

people suppliedcoordination age

lengthsensitive customer

category of street

failure rate

materialhydraulic

criticality indexleakage

pressure

water quality

entity ID

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Steps of annual rehab planning

4. 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 => sort list

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

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Steps of annual rehab planning

5. 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

technology namekindprincipleusing corrosion

leakagestatics

coststage length max

pressure minmax

inspectioncleaning

old pipe DN minmax

material CIGGGSTGRPCONPEPVC

new pipe materialDNroughnessservis lifestatics

hole startend

service pipe

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Decision support for the Annual Planning

1. CARE-W_ARP

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Priorities of operator „BVK“Weight 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

2. 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

Brno University of Technologyhttp://water.fce.vutbr.cz

Tomáš Kučerakucera.t@fce.vutbr.cz

Thank you for your attention