The Water and Sanitation Project - Municipal Institute of ... Enhancement... · May-04 Dec-04...

ETHEKWINI WATER AND SANITATION

TECHNICAL OVERVIEWOF

WATER LOSS / WATER DEMAND MANAGEMENT

APRIL 2012

Municipalities must halve their water losses by 2014 –President Jacob Zuma – State of the nation address

March 2009

• 3,6 million people

• 646 000 properties

• Supply 845 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

• 470 000 water connections

• Combined annual expenditure of R4.7bn (2011/12)

• Municipal budget 2011/12 R26bn

eThekwini Municipality Quick Statistics

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 Strategic Plan Objectives NRW by volume for 2008/2009 – 39.8% (ILI 8.8) NRW by volume for 2009/2010 – 37.5% (ILI 8.4) NRW by Volume for 2010/2011 – 32.3% (ILI 6.8) Target for June 2013 – 30% loss Target for June 2018 – 25% loss (ILI 4.5)

2% NRW reduction per annum is realistic.

SIV Reduction – Real Losses

• Rezoning - New Pressure Standard -2.5bar –6 bar

• Advanced pressure management (optimising existing + controllers)

• Active prv Maintenance

• GSM based failure detection devices on prv’s

• Step testing & Leak detection

• 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.

• Performance management System

• Reservoir overflows (incl response time)

• Reservoir integrity (leaks)

• New Asset management Branch created

Current Annual Volume of Real

Losses

Economic Level of Real Losses

Unavoidable Annual Real

Losses

Speed and Quality of

Repairs

Active Leakage Control

Pip

elin

e

Ma

teria

ls M

an

age

me

nt

Pre

ssure

M

an

age

me

nt

Visual leaks

0

500

1000

1500

2000

2500

3000

16

:50

17

:05

17

:20

17

:35

17

:50

18

:05

18

:20

18

:35

18

:50

19

:05

19

:20

19

:35

19

:50

20

:05

20

:20

20

:35

20

:50

21

:05

21

:20

21

:35

21

:50

22

:05

22

:20

22

:35

22

:50

23

:05

23

:20

23

:35

23

:50

00

:05

00

:20

00

:35

00

:50

01

:05

01

:20

01

:35

01

:50

02

:05

02

:20

02

:35

02

:50

03

:05

03

:20

03

:35

03

:50

04

:05

04

:20

04

:35

04

:50

05

:05

05

:20

05

:35

05

:50

Min

imu

m N

igh

t Fl

ow

Rat

e (

m3

/hr)

Typical Time Period

Durban CBD PRV ProjectDemand Flow Trends

14-Jan-09 04-Feb-09 18-Feb-09 14-Mar-09 18-Mar-09

25-Mar-09 20-Aug-09 29-Nov-09 08-Sep-10 29-Aug-11

Baseline MNF: 1865m3/hr

PRV Commissioned - Stage 1MNF: 760m3/hr

MNF reduction since baseline:1 482m3/hr or 26,7Ml/dayQadd reduction since baseline:33,6 Ml/dayQmax reduction since baseline:1330 m3/hr

Stage 2 - MNF: 531m3/hr Stage 3 - MNF: 487m3/hr

i20 Critical Point Target = 26mMNF: 343m3/hr

Pressure Management Example 1

0

10

20

30

40

50

60

70

0

20

40

60

80

100

120

140

160

180

12

:00

12

:30

13

:00

13

:30

14

:00

14

:30

15

:00

15

:30

16

:00

16

:30

17

:00

17

:30

18

:00

18

:30

19

:00

19

:30

20

:00

20

:30

21

:00

21

:30

22

:00

22

:30

23

:00

23

:30

00

:00

00

:30

01

:00

01

:30

02

:00

02

:30

03

:00

03

:30

04

:00

04

:30

05

:00

05

:30

06

:00

06

:30

07

:00

07

:30

08

:00

08

:30

09

:00

09

:30

10

:00

10

:30

11

:00

11

:30

Pre

ssu

re m

Flo

w m

3/h

DV3022 Representative Results from PRV Optimisation

Before Profile After Profile D/S Before D/S After

Reduction in Qadd = 494m3orApproximately R49 285 per month

Daily Volume Before: 2163.88 m3

Daily Volume After: 1669.52 m3

Pressure Management Example 2

Leak Detection Example

0

500

1000

1500

2000

2500

20

09

/12

/03

20

10

/01

/22

20

10

/03

/13

20

10

/05

/02

20

10

/06

/21

20

10

/08

/10

20

10

/09

/29Fl

ow

rate

(kl/

hr)

Logging Period (05/01/2010 - 04/08/2010)

Umlazi 1 Real Loss Reduction

Flow Profile Monitoring

Theoretical Average Zone Pressure : 57m Theoretical Average Zone : 56m

5 PRV Settings Optimised

FEB/MARCH/APR/MAY = 1425 leaks found & repaired

FEB/MARCH/APR/MAY/JUNE = 1740 leaks found & repaired

FEB/MARCH/APR/MAYJUNE/JULY = 2007 leaks found & repaired

631.48kl/day 470.65kl/day 327.83kl/day 509.33kl/day 334.56kl/da

FEB/MARCH/APR/MAY/JUNE/JULY/AUG = 2440 leaks found & repaired

• 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 (22 000 pa)• 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 March 2010 and prosecutions now taking place

• 75 Custody Transfer Points – Bulk Purchase from Umgeni Water (4 upgrades)

• Top 17 sites account for 99% of volume purchased - R3m / day

Apparent / Commercial Losses

Current Annual Volume of Apparent

Losses

Economic Level of Apparent Losses

Unavoidable Annual

Apparent Losses

Policy and Enforcement

Water Accounting

Controls

Data H

and

ling

Co

ntro

ls

Cu

stom

er

Mete

r M

anage

me

nt

Jul-11 Aug-11 Sep-11

(all figures indicated are cumulative)

Baseline Target 33.0% 33.0% 33.0%

Achievement - Month 38.5% 38.5% 32.6%

Achievement to Date (12-

Month Rolling Average)33.6% 34.0% 33.9%

Baseline Target 637.0 637.0 636.0

Achievement - Month 702.0 707.0 594.0


Month Rolling Average) 637.0 639.0 635.0

Baseline Target 20.5 20.5 20.4

Achievement - Month 20.7 23.9 19.4


Month Rolling Average) 20.5 20.7 20.6

Baseline Target 54.0 54.0 54.0Achievement to Date

(YTD) 54.0 54.0 54.0

Baseline Target -1.0 -2.0 -3.0Achievement to Date

(YTD) -19.2 -11.0 -13.6

Description2011/12 FY

Target

SIV Reduction (Ml/day)

20.0

52.5

-12.0

Op23 Total Water Losses per Connection

(l/conn/day)

Fi 46 NRW by Volume 33.0%

630.0

Op28 Real Losses per Mains Length (m3/km/day)

Average Zone Operating Pressure (m)

Monthly Performance Indicators

REAL LOSS REDUCTION:

110 PRV's Baseline Target 8 16 25

Achievement to Date 10 17 19

Performance to Date 125% 106% 76%

100 PRV's Baseline Target 5 10 15



30 sites Baseline Target 0 0 0



4000km Baseline Target 330 660 990



20000 Baseline Target 1650 3300 4950



Leak detection Length of mains surveyed (km)

Leak repair Number of visible and non-visible leaks

repaired

Pressure reduction (rezoning) Number of new PRV sites designed

Pressure reduction (rezoning) Number of new PRV sites commissioned

Advanced control Commissioning of new controllers

Monthly Performance Indicators 2

RealLoss Reduction


400 Baseline Target 20 40 60


















Custody Transfer Points Installation and commissioning of new sales

check meters at top 3 Umgeni Water custody

transfer points

Custody Transfer Points Verification of sales check meters at top

Umgeni Water custody transfer points

Housing projects Bulk/Individual to all Metro Housing projects

(connections)

Continued meter replacement

(ICI)

Non-domestic meters >=50mm dia >5/10/20

years to be changed by NRW (connections)


(ICI)

Non-domestic meters >= 20mm >5/10/20 years

to be changed by Water Services

Informal area metering Bulk controlled metering to informal

settlements (connections)

Commercial Loss Reduction 1/2









Achievment to Date 276 444 728


16% Baseline Target 27.6% 26.6% 25.6%

Achievment to Date 27.6% 28.0% 27.8%





94% Baseline Target 89.9% 90.3% 90.6%

Achievement to Date 89.9% 89.2% 89.9%


Regularise illegal connections

(non-ICF)

Number of prosecutions at Municipal Courts

% of connections with "good

reads"

% of consumer meters that receive a valid bill

that does not include a consumption of 0, 1 or

unchanging, or is estimated for a period of 3

consecutive months

Incomplete connections Completion of post-2008 list - incomplete

connections (does not include WD's and/or

EBU's)


(domestic)

>20 Years old according to EWS meter

changeout policy

% EBU connections using >400

l/day

% of EBU connections using more than 400

litres/day

Incomplete connections Completion of pre-2008 list - incomplete

connections (does not include WD's and/or

EBU's)

Commercial Loss Reduction 2/2

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 December 2011

Total SIV - Monthly eThekwini Water Sales Total number of connections

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

Performance Indicators

Fi 46 – NRW by Volume (%)

WR 1 - Inefficiency of use 23.9%

OP 23 - Total Water Losses per Connection – 631 l/conn/day

Op 27 - Real Losses Per Connection – 448 l/conn/day

OP 28 - Real Water Losses per km – 18.8 kl/km/day

Op 29 - ILI – Infrastructure Leakage Index – 6.8

World Bank Physical Loss Assessment Matrix

10 m 20 m 30 m 40 m 50 m

A 1 - 2 < 50 < 75 < 100 < 125

B 2 - 4 50-100 75-150 100-200 125-250

C 4 - 8 100-200 150-300 200-400 250-500

D > 8 > 200 > 300 > 400 > 500

A 1 - 4 < 50 < 100 < 150 < 200 < 250

B 4 - 8 50-100 100-200 150-300 200-400 250-500

C 8 - 16 100-200 200-400 300-600 400-800 500-1000

D > 16 > 200 > 400 > 600 > 800 > 1000

Technical

Performance

Category

ILI

Liters/connection/day (when the system is pressurized) at an average pressure

of:

De

ve

lop

ed

Co

un

try

Sit

ua

tio

n

De

ve

lop

ing

Co

un

try

Sit

ua

tio

n

Future PerspectivesDevelop NRW culture throughout

OrganisationEnsure every task is done to the best

of our ability

Thank you

To Measure is to Know – increase coverage of online monitoring

Least Cost Optimisation balancing Capex and Opex

The Water and Sanitation Project - Municipal Institute of ... Enhancement... · May-04 Dec-04...

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