Somarela Thothi Water Loss Reduction Partnership

WRP Pty Ltd 1

2015/08/28

Presented by: Moeti Matswiri

BACKGROUNDBACKGROUND

Botswana and Limpopo River BasinBotswana and Limpopo River Basin Project area characteristicsProject area characteristicsWater supply to approximately 560 000 people (>25% of Botswana population)

Experience worst drought since 1983

Water rationing introduced in April 2013

2012/13 demand without rationing = 3.6 million m3/month

2014/15 demand with rationing = 3.0 million m3/month

Severe drought and load shedding – unable to operate water treatment plants and pumps

108 Ml/day treatment capacity not available due to failure of Gaborone dam

Water supply to approximately 560 000 people (>25% of Botswana population)

Experience worst drought since 1983

Water rationing introduced in April 2013

2012/13 demand without rationing = 3.6 million m3/month

2014/15 demand with rationing = 3.0 million m3/month

Severe drought and load shedding – unable to operate water treatment plants and pumps

108 Ml/day treatment capacity not available due to failure of Gaborone dam

Letsibogo dam (46.7%)

Bokaa dam (0%)

Gaborone dam (0%)

Molatedi dam (south Africa) (9.4%)

North South Carrier is the main water resource 1000 to 1400mm diameter 356km pumping main 4 major pumping stations Unreliable power supply

Supply from Molatedi dam (SA) curtailed due drought in NW

Gaborone Dam 70% FullOctober 2006

Gaborone Dam 70% FullOctober 2006

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Gaborone Dam 2% Full July 2015

Gaborone Dam 2% Full July 2015

View from yacht club

Bulk water supply to Greater Gaborone

Bulk water supply to Greater Gaborone

0

500000

1000000

1500000

2000000

2500000

3000000

3500000

4000000

4500000

Apr‐03 Apr‐04 Apr‐05 Apr‐06 Apr‐07 Apr‐08 Apr‐09 Apr‐10 Apr‐11 Apr‐12 Apr‐13 Apr‐14 Apr‐15

Volume Water Supplied

 (m

3 /month) 

Treated water to Greater Gaborone (without rationing) Treated water to Greater Gaborone (with rationing)

Rationing startedApril 2013

Mmamashia WTWDesign capacity = 110Ml/d

Gaborone WTWDesign capacity = 108Ml/day

All areas previously supplied from Gaborone

WTW must now be supplied from

Mmamashia WTW

Area supplied fromMmamashia WTW

Area supplied fromGaborone WTW

35km

Impact of Gaborone dam failureImpact of Gaborone dam failure

PROJECT SOMARELA THOTHIPROJECT SOMARELA THOTHI

Project Partnership (PPP)Project Partnership (PPP)

Fund awareness campaign

Fund bulk metering and sectorisationReinvest project savings

Fund pressure management

Project objectivesProject objectives

Implement technical and social interventions in the Greater Gaborone area to reduce water losses

Model has a country wide replication potential through an innovative re-investing model

WUC committed themselves to ring fence 5.49 Pula for every m³ water saved through the project

Training and capacity building of WUC staff to replicate project

Implement technical and social interventions in the Greater Gaborone area to reduce water losses

Model has a country wide replication potential through an innovative re-investing model

WUC committed themselves to ring fence 5.49 Pula for every m³ water saved through the project

Training and capacity building of WUC staff to replicate project

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InterventionsInterventions

Community awareness- Creating informed community

- Establish partnership between WUC and community

- Encourage ownership and responsibility

Bulk metering and sectorisation- Identification and quantification of high water loss

areas and subsequent interventions

- Benchmarking of water losses

Pressure management- One of the most cost effective water loss

interventions

Community awareness- Creating informed community

- Establish partnership between WUC and community

- Encourage ownership and responsibility

Bulk metering and sectorisation- Identification and quantification of high water loss

areas and subsequent interventions

- Benchmarking of water losses

Pressure management- One of the most cost effective water loss

interventions

Awareness trainingAwareness training

COMMUNITY AWARENESSCOMMUNITY AWARENESS

Schools awareness campaignsSchools awareness campaigns

Outreach activitiesOutreach activities

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BASELINES, BULK METERING AND SECTORISATIONBASELINES, BULK METERING AND SECTORISATION

Baseline assessmentBaseline assessment

0

50 000

100 000

150 000

200 000

250 000

300 000

Volume W

ater Supplied (m

3/m

onth) 

Mochudi pre‐rationing Mochudi post‐rationing Linear (Mochudi pre‐rationing) Linear (Mochudi post‐rationing)

Pre-rationing Post-rationing

Baseline assessment critical component of project to measure savings

Difficult to measure savings due to rationed water supply

Typical pressure logging in rationed DMA

Typical pressure logging in rationed DMA

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

2013

/07/

20

2013

/07/

31

2013

/08/

19

2013

/08/

29

2013

/09/

09

2013

/09/

23

2013

/10/

28

2013

/11/

08

2013

/11/

19

2013

/11/

29

2013

/12/

10

2014

/01/

03

2014

/02/

01

2014

/02/

13

2014

/02/

23

2014

/03/

06

2014

/03/

17

2014

/03/

27

2014

/04/

07

2014

/04/

17

2014

/04/

28

2014

/05/

09

2014

/05/

19

2014

/05/

30

2014

/06/

10

2014

/06/

20

2014

/07/

01

2014

/07/

11

2014

/07/

22

2014

/08/

02

2014

/08/

12

2014

/09/

22

2014

/10/

03

2014

/10/

13

2014

/10/

24

2014

/11/

03

2014

/11/

14

2015

/04/

02

2015

/04/

12

2015

/04/

23

Pre

ssu

re (

bar

)

GW02W (Ph2 Masa) Flow and pressure logging

P average

Phakalane night flow analysisPhakalane night flow analysis

0

50

100

150

200

250

300

350

2015/05/1100:00

2015/05/1300:00

2015/05/1500:00

2015/05/1700:00

2015/05/1900:00

2015/05/2100:00

Flo

w r

ate

(m3/

h)

Flow Expected MNF AVG MNF

Average flow = 140m3/h

Measured minimum night flow = 65m3/h

Expected minimum night flow = 12m3/h

Excess night flow = 53m3/h

MNF / AVG = 46%

MNF remains consistent irrespective of rationing

Only reliable method to determine savings

SectorisationSectorisation

It is important to properly document project findings and results.

Train and capacitate client to continue process

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PRESSURE MANAGEMENTPRESSURE MANAGEMENT

High Pressure Photo: Courtesy Ken Brothers

Low PressureLow Pressure Photo: Courtesy ken Brothers

Mogoditshane

Sebeli

Northern suburbs

Block / Airport PRV

Glen Valley

Existing PRV

Proposed PRV

Tlokweng

Ostrich

Gaborone Current & Proposed Pressure Management AreasGaborone Current & Proposed Pressure Management Areas

GaboroneWTW

MmamashiaWTW

More than 20 existing PRVs have been identified during the project – started with 5

Most PRVs not operational

PRV maintenancePRV maintenance Pressure Management ResultsPressure Management Results

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Pressure at BOBS critical pointPressure at BOBS critical point

0

1

2

3

4

5

6

7

8

Pre

ssu

re (

bar

)

June 2015 – PRVs setJune 2014 - PRVs open

Average pressure = 5.2 bar

Average pressure 2.1 bar

A significant reduction in the number of bursts

has been observed

Mogoditshane Pressure Management

Mogoditshane Pressure Management

0

50

100

150

200

250

300

2015/07/1300:00

2015/07/1500:00

2015/07/1700:00

2015/07/2400:00

2015/07/2600:00

2015/07/2800:00

2015/07/3000:00

2015/08/0100:00

2015/08/0300:00

2015/08/0500:00

Flow rate (m

3/h)

PRVs set

Average flow = 74m3/hAverage MNF = 12m3/h

Average flow = 140m3/hAverage MNF = 112m3/h

Saving = 77m3/h = 1848m3/day = 674 520m3/annum

PRVs open Rationed water supply

Broadhurst PRVBroadhurst PRV Training and capacity building Training and capacity building

Repair of visible leaksRepair of visible leaks December 2015 targetsDecember 2015 targets

3.1 million m³ water saved

Ring fencing and reinvestment of savings for countrywide replication

17 million Pula financial savings for an initial investment of 5 million Pula

3.1 million m³ water saved

Ring fencing and reinvestment of savings for countrywide replication

17 million Pula financial savings for an initial investment of 5 million Pula

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ConclusionsConclusions

Success of the Project Somarela Thothi will not only benefit Botswana but the river basin

Start water conservation and water demand management as early as possible

Difficult to implement WDM and measure savings with rationing and the MNF only reliable measure

Rationing is detrimental to infrastructure, demotivates staff, loss of income, affects water quality, corrupts water meters and politically sensitive

There is huge scope for private sector participation as they are equally affected by the drought

Success of the Project Somarela Thothi will not only benefit Botswana but the river basin

Start water conservation and water demand management as early as possible

Difficult to implement WDM and measure savings with rationing and the MNF only reliable measure

Rationing is detrimental to infrastructure, demotivates staff, loss of income, affects water quality, corrupts water meters and politically sensitive

There is huge scope for private sector participation as they are equally affected by the drought

AcknowledgementsAcknowledgements

Thank youThank youMr Moeti Matswiri

Leakage Control Engineer

Botswana Water Utilities Corporation

E-mail : MMatswiri@wuc.bw

Cell: +267-71300841

Mr Moeti Matswiri

Leakage Control Engineer

Botswana Water Utilities Corporation

E-mail : MMatswiri@wuc.bw

Cell: +267-71300841