Simon Scruton

SimonSc@dmws.durban.gov.za

Contents• Water in perspective

• 10 Year Predictions

• NRW Strategic Plan Objectives

• Targeted Figures

• Real Loss Interventions

• Apparent Loss Interventions

• Trends

• Conclusion

• 3,6 million people

• 646 000 properties

• Supply 870 Ml/day of water from 9 Treatment Works

• Treat 500 Ml/d of Waste Water

• 263 Water Reservoirs

• 27 Waste Water Treatment Works

• 7 000 km of sewer mains

• 12 000km of water mains

• 475 000 water connections

• Combined annual expenditure of R5.3bn (2012/13)

• Municipal budget 2012/13/11 R31.3bn

eThekwini Municipality Quick Statistics

• SA is a water scarce country

• Average NRW for Africa is 58%

• SA NRW is estimated at 34% but many LA’s cannot perform water balances

• Global warming is a harsh reality

• We need to become more environmentally friendly

• We need to mold our projects to be conserve our resources and examine the cradle to cradle implications

• The production and transportation of potable water and the disposal of waste water account for up to 20% of our energy consumption.

Water – In perspective

Why is NRW reduction an issue?Water reconciliation situation in the Mgeni River System (September 2011)

Existing System Yield (Including Growth in Darvill

Return Flows)

250

300

350

400

450

500

550

600

650

2004 2006 2008 2010 2012 2014 2016 2018 2020 2022 2024 2026 2028 2030

Wa

ter

Re

qu

ire

me

nts

/ Y

ield

(millio

n m

3/

an

nu

m)

Spring Grove Dam

Re-use of Treated

Effluent

Mkomazi River Development

(Smithfield Dam)

Deficit

September 2011

Water Requirements

Scenario

Pipeline from

Spring Grove Dam

Earliest Re-use Implementation

Earliest MkomaziImplementation

• NRW by volume for 2009/2010 – 37.5%

• NRW by volume for 2011/2012 – 35.4%

• Target for June 2013 – 33% loss

• Target for June 2018 – 25% loss (ILI 4.5)– 2% NRW reduction per

annum is realistic.

NRW Strategic Plan Objectives

Main drivers Reduce real losses AC Mains replacement Active leak detection Pressure reduction Rezoning Improving reservoir integrity

Reduce apparent losses Illegal connection rectification Billing data integrity improvements Improve meter accuracy

Trends

System OverviewNorth Operational Area:

3000km of Water Mains

120000 Service Connections

214 PRVs79 Reservoirs

South Operational Area:

4500km of Water Mains

180000 Service Connections

200 PRVs

104 Reservoirs

West Operational Area:

3600km of Water Mains

120000 Service Connections

650 PRVs

78 Reservoirs

Phase 1a“System Assessment”

• System knowledge• Identify problems• Quantify problems

• Identify cost-effective intervention

• Prioritize intervention

Phase 1b“System Optimisation”

• Maximize Operational Efficiency• Maximize Financial Efficiency

Minimize LossesReal Loss Control:

• Review of Service Supply Standards

• Infrastructure Improvements

• Optimal Zoning• Pressure Management

(fixed outlet optimisation)• Leak Detection and Repair

Apparent Loss Control:

• Meter Testing & Calibration• Illegal Connections

Maximize Billed Consumption:

• Database populationaccuracy

• All occupied propertieshave connections

• Illegal connections• Customer category

• Cost recovery

“80/20”

Phase 2“Future Intervention”• Real Loss Reduction

• Apparent Loss Reduction

Phase 3“Sustainability”

• Preventative Maintenance• Active leak detection

• Water Balances• Reporting

NRW Programme Implementation

EWS NRW

Apparent Loss

Consultant

Pressure Optimisation

Team

NRW Reduction Team: Ops

North

NRW Reduction Team: Ops

South

NRW Reduction Team: Ops West

Leak Detection & Repair: Ops

North

Leak Detection & Repair: Ops

South

Leak Detection & Repair: Ops

West

Civils Contractor: Ops North

Civils Contractor: Ops South

Civils Contractor: Ops West

Lead Consultant

EWS Design (AC Mains

Relay)

Lead Consultant

Area Consultant

x4

Mains Relay Contractor

x4

Area Based NRW Reduction Team Structure

Project Manager

(ACP)

Data Analyst Expert

Project Engineer

Project Technician: zone

preparation & integrity

Project Technician:

field measurements

Project Technician:

leak detection

GIS/CAD Operator

Field Assistant

Field Assistant

Field Assistant

Field Assistant

Data capture

clerk

Field Inspector

Field Inspector

Field Inspector

Water Exported Billed Water

m3/day Exported

± x % Billed m3/day

Own Authorised ± x % Revenue

Sources Consumption Billed Metered Water

m3/day m3/day Consumption m3/day

± x % ± x % m3/day ± x %

Authorised ± x %

Consumption Billed Unmetered

m3/day Consumption

± x % m3/day

± x %

Unbilled Metered

Consumption

Unbilled Authorised m3/day

System Water Consumption ± x %

Input Supplied m3/day Unbilled Unmetered

m3/day m3/day ± x % Consumption

± x % ± x % m3/day

Imported ± x % Non-revenue

Water Unauthorised Water

m3/day Apparent Consumption m3/day

± x % Losses m3/day ± x %

Water m3/day Metering

Losses ± x % Inaccuracies

m3/day m3/day

± x % Mains Leaks

Real m3/day

Losses Reservoir Overflows

m3/day

m3/day Service connection

± x % Leaks

m3/day

IWA Water Balance

SIV Reduction – Real Losses• Rezoning - New Pressure Standard -2.5bar –

6bar (225 designed /300 commissioned)• Advanced pressure management (optimising

existing + controllers) (57 sites)• Active prv Maintenance (2500 inspections)• GSM based failure detection devices on prv’s

(100)

• Leak detection (5000km / 19000 leaks)

• AC mains relay (incl rezoning + replace connection pipes) (1800 km)

• New Fault Manager software to assist with analysis of faults data. Improve speed and quality of repairs.

• Reservoir overflows (incl response time)• Reservoir integrity (leaks)

Advanced Pressure

Management in the Durban CBD

Results to date

• New standards for meter installations• Change out programme for meters 40mm and

greater and older than 10 years (1000) • Ensure Top 200 meters < 5 years old• Change out programme for domestic meters

older than 20 years (22 346)• Checking Council databases for properties

with existing buildings or electrical connections that don’t have a water connection

• Checking of all Government owned properties for multiple connections

• Checking properties where connections were previously removed

• Amnesty Programme commenced 15/03/2010• Prosecutions have commenced as well

Apparent / Commercial Losses

• 75 Custody Transfer Points – Bulk Purchase from Umgeni Water (3 upgrades)• Top 17 sites account for 99% of volume purchased ± R3m / day

Weekly Monitoring

Number of new PRV zones designed and handed over to Contractor (all sources) No 232 4 35 31 88%

Number of new PRV's commissioned and handed over to Operations No 300 5.9 47 1 2%

Number of PRV controllers commissioned No 57 1.1 9 3 34%

Length of mains completed leak detection surveys (all levels) km 7500 144 1152 697 61%

Number of leaks detected and repaired (all types) No 9000 172 1376 3362 244%

Number of new informal area meters (Type K) handed over to Contractor No 600 12 96 229 239%

Number of new informal area meters (Type K) installed and commissioned No 600 12 96 16 17%

Number of new informal area meters (Type K) registered in COINS No 600 12 96 16 17%

Number of remaining reservoir outlet meters not registered in COINS No 48 1 40 46 87%

2010/11 FY

Weekly Target:

FY2010/11

Performance to

Date: FY2010/11

Target:

FY2010/11Key Performance Indicator: Consolidated EWS Unit

Target to Date:

FY2010/11

Progress to

Date:

FY2010/11

ETHEKWINI WATER AND SANITATION

NON-REVENUE WATER BRANCH

NRW TARGET AND ESTIMATED IMPACT: 2010/11 FINANCIAL YEAR v1.3

Intervention Description2010/11 FY

TargetJul-10 Aug-10

REAL LOSS REDUCTION:

Pressure reduction (rezoning) Number of new PRV sites designed 225 PRV's Baseline Target 10 20

Achievment to Date4 31

Performance to Date40% 155%

Pressure reduction (rezoning) Number of new PRV sites commissioned 300 PRV's Baseline Target 10 35

Achievment to Date0 1

Performance to Date0% 3%

Advanced control Commissioning of new controllers 57 sites Baseline Target 5 10

Achievment to Date1 3

Performance to Date20% 30%

Leak detection Length of mains surveyed (km) 7500km Baseline Target 650 1300

Achievment to Date458 697

Performance to Date70% 54%

Leak repair Number of visible and non-visible leaks repaired9000

Baseline Target780 1560

Achievment to Date1831 3362

Performance to Date235% 216%

150000

200000

250000

300000

350000

400000

450000

500000

550000

600000

12000000

14000000

16000000

18000000

20000000

22000000

24000000

26000000

28000000

30000000

32000000

May-04 Dec-04 Jul-05 Feb-06 Sep-06 Apr-07 Nov-07 Jun-08 Jan-09 Aug-09 Mar-10 Oct-10 May-11 Dec-11

Nu

mb

er

of

Co

nn

ect

ion

s

Mo

nth

ly V

olu

me

s (k

l)eThekwini Water and Sanitation

Monthly Volumes and Connections May 2004 to June 2012

Total SIV - Monthly eThekwini Water Sales Total number of connections

12 per. Mov. Avg. (Total SIV - Monthly) 12 per. Mov. Avg. (eThekwini Water Sales)

• This programme has realised savings of R310m in the past 3 financial years at EWS at a cost of R152.6m

Results

Lessons Learnt• In order for any NRW reduction

intervention to be successful, theentire water company must fullysupport all aspects of lossmanagement and provide acoordinated effort to reduce allNRW. This is not to beunderestimated!

• Consumer education is equallyimportant. Unless the consumersaccept and subscribe to ourpolicies we will forever beremoving vast numbers of illegalconnections and penalising thosewho do not pay.

• Asset management is ofparamount importance and can nolonger be left to accident.

• The modern engineer must beconcerned with life cycle costing.

Lessons learnt• Qualified staff are the biggest

asset of the Municipality and must

be recruited and remunerated and

retained.

• Stricter policy and enforcement

enable the municipality to improve

performance. This will be pivotal

with the Amnesty Programme.

• The lowering of the design

pressures is having a great impact

(NRW reduction, bursts, pipeline

life)

• The tide has started to turn and the

results are becoming visible.

Recommendations Adequate funding is sourced

and pressure management is rolled out throughout eThekwini, KZN and SA.

Pressure standards in distribution systems must be minimised as per global trends.

Social solutions must be explored and implemented in conjunction with capital projects.