Water Services Training Group

Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

Water Services Training Group

13th Annual Conference

10th September 2009


Prioritising Mains for Rehabilitation/Replacement – Large Rural Areas

Gerard GibneyManaging Director

Introduction

Mains Rehabilitation/Replacement - Why?

Large Rural Areas

Prioritisation

Key issues for Effective Mains Rehabilitation/Replacement

Why implement Mains Rehabilitation/Replacement?

On one hand: Budgetary Constraints

But: Water Networks:

Do Breakdown/Deteriorate Do Require Maintenance Do Require Replacement/Rehabilitation

Failure to manage networks based on least life cycle cost strategies will result in increased cost over the long term.

Asset Life Time Costs

Annual Cost of ReplacementAnnual Cost of Replacement

Annual Maintenance Cost


Whole Life Cost = Cost of Maintenance + Cost of Replacement

Minimum Whole Life Cost


Value for Money

In the current economic environment value for money is paramount

Targeted Spending - Cost Effective Systematic and structured approach Asset Management

Most Efficient Repair/rehabilitation: Planned Repair/Rehabilitation 70-80% Reactive Repairs/Rehabilitation 20-30%*


* Thinking, Getting and Staying Competitive: A Public Sector Handbook, Association of Metropolitan Sewerage Agencies and Association of Metropolitan Water Agencies, 1998

Asset Management

Initially Asset Management requires the development of:

Asset Inventories (CIS - a good starting point)

Critical Asset Lists (For water networks this is a product of Stage 1 and

Stage 2 Works – L6/07)

Stage 3 Water Conservation vital part of Asset Management

Internationally -What Others are Doing ?

US Projections - $100’s bn for water infrastructure over the next 20 years

Hong Kong - $ 2.5 billion Project UK Water Companies rehabilitated

4,565Km (>1%) of Water Mains in the 2006-2007 period.* 1,489Km Relined* 3,076Km Replaced** From “Financial performance and expenditure of the water companies in England and Wales 2006 -2007 report” by OFWAT

Case Study – Greater Berlin Water Supply System

West Berlin vs. East Berlin (pre-reunification) where systematic network replacement (circa 1% p.a) had been carried out in West Berlin but not East Berlin:

Bur

sts

per

Km

1991-2005 (Systematic replacement of network in East Berlin circa 1.5% p.a; West Berlin circa 0.65%; OA 0.8-1%)

Bur

sts

per

Km


Case Study – Greater Berlin Water Supply System B

urst

s pe

r K

m

Cast Iron

Notice that 20-40 year old cast iron was bursting more frequently than 50-80 year old.


After studies and large initial investment Berlin Water calculated that the optimum replacement requirement over 10 years was 0.25% per year (OA 0.375% p.a).

How do we compare ? Irl in an International Context (using Infrastructure Leakage Index

(ILI))

Why implement Stage 3?

International Findings: Netherlands: – Annual Investment

€507m (1997) to €341m (2007)

“…. emphasis on quality investments …decisions to replace pipelines are based on better information provision (smart asset management)” - Vewin

Water Company, Water Supply Statistics (2007)

‘SMART ASSET MANAGEMENT’

Mains Rehabilitation - L6/07

“Rehabilitation of watermains….address different problems e.g. leakage, security of supply, quality, flow restriction etc.….. Water Conservation is the primary objective…………….’


National Water Conservation Programme


Stage 1 Stage 2

WSTG Training

Stage 3 – Rehabilitation

Commenced

} Advanced

National Water Conservation Programme - ProgressUFW Summary (%)

05

10152025303540455055606570

Dub

lin T

otal

Dub

lin C

ity

Dun

laoi

ghre

Fing

al

Sout

h Dub

lin

Wickl

ow

Bray

Kild

are

Car

low

Cav

an

Cla

re

Cor

k City

Cor

k Cou

nty

Don

egal

Gal

way

City

Gal

way

Cou

nty

Kerr

y

Kild

are

Kilk

enny

Laoi

s

Leitr

im

Lim

erick

City

Lim

erick

Cou

nty

Long

ford

Lout

h

May

o

Mea

th

Mon

agha

n

Nor

th T

ippe

rary

Off

aly

Rosc

omm

on

Slig

o

Sout

h Ti

pper

ary

Wat

erfo

rd

Wat

erfo

rd C

ity

Wes

tmea

th

Wex

ford

Wickl

ow

Suggested Target Level of UFW from NWS (25%) Average Level of UFW 2008 (44%)

Water Conservation in Ireland


44%

Extract from WSTG Guidance Manual “Network Management – Leakage Control”

Current Situation In Ireland- Volumes of UFW


Leakage Management


Pressure Management• Reduce new break frequencies• Reduce real losses

Demand Management• Consumer metering• Water efficient fixtures• Public awareness

Active Leakage Control• DMA Monitoring • Leak Detection• Leak Repair

Pipeline and Assets Management

• Selection• Installation• Maintenance• Renewal• Replacement

Asset (Network) Size


L6/07 Prioritisation Strategy

Rehabilitation Strategy Current status of Water Conservation

Programme Identify critical DMAs (Prioritise by DMA)

Rehabilitation Works Proposals Assessment of mains (Prioritise Mains) Develop work packages


Effective Prioritisation of Works


Information – Key!

Stage 1 & 2 Works – Ongoing Active Leakage Control Pressure Management Demand Management

Data Management Systems CiS Leak Repair Database Telemetry Systems Non-Domestic Metering

Resources Project Management Team Leak Detection Teams Leak Repair CiS Maintenance


Information – Key! - Rural Water Programme Experience

Challenges in GWS Rural Water Sector High UFW Limited Fittings – Stoptaps, Valves Poor Information – Location, Bursts, Fittings Limited Resources – Part-time caretakers High Ratio of length of service connections/length of

distribution mains Shared Service Connections

Advance Works – Installation of Stoptaps; to determine extent of distribution

side and consumer side leakage Installation of DMA meters and valves; to identify sections of

distribution mains with high leakage


Information – Key! - Rural Water Programme Experience


Demand Management

Mains Rehabilitation

Active Leakage Control + Pressure Management

L6/07 Prioritisation Strategy

Prioritise by DMA Characteristics of Mains Connections Structural and Leakage Performance Water Quality Hydraulic Performance

Prioritise Mains Burst Frequency Leakage Physical Condition Soil Corrosivity Head Loss Age Importance


Rehabilitation Strategy Reports - Prioritisation of DMA’s


Rehabilitation Strategy Reports Prioritisation of DMA’s


Prioritisation – Sample Counties - % UFW


•Based on Countywide Rehabilitation/Replacement Reports and Projects

Prioritisation – Sample CO’s % Rehabilitation


•Based on Countywide Rehabilitation/Replacement Reports and Projects

Replacement: 0.8% to 1.1% p.a.

Implementation-Rehabilitation / Replacement Works


Detailed Design

Outline Design

Site Investigation

Archaeology Ecology Consent Licence

Construction Works



Value Value ForFor

MoneyMoney

Conclusions/Summary

Information is Key ! Stage 1 & 2 – ‘Mainstream’ Cost Effective Targeted Spending Stage 3 – Mains Rehabilitation

‘‘SMART ASSET MANAGEMENT’SMART ASSET MANAGEMENT’


‘‘VALUE FOR MONEYVALUE FOR MONEY’’

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