water conservation and water demand management progress with the strategy implementation 16...

Water Conservation and Water Demand Management

Progress with the Strategy Implementation

16 September 2010

Background

WC /WDM Strategy– CCT commitment to implementation• CCT 1st metro in SA to develop and implement• CCT only metro in SA with fully dedicated team for

WDM– 10 year plan (2006-2016)– 5 specific goals– Wants to save 90 million m3/a by 2016/17– Critical component of WC Water Supply Scheme– DWA wants to know

Background

CCT made an undertaking (pg 68 of Strategy document)

“CCT will commit over the next five years to implementing and monitoring a comprehensive WC/WDM strategy. In such a time no decision should be taken regarding any further water augmentation scheme in order to verify the full potential of WC/WDM. After five years the full impact and potential of the WC/WDM must be clearly demonstrated by CCT and re-evaluated. All assumptions made in the current analysis on the role of WC/WDM will be tested and adequately researched.”This report reflects the pro-active

approach of CCT in monitoring and re-evaluating the strategy after 3

years of implementation

Background

5 Strategy Goals

Progress Summary

Why measure progress?• Need to measure impact on WDM• DWA – if only achieving 50% success then will

need new augmentation by 2015• If not achieving need to understand why not• Need to know if re-alignment of Strategy is

needed

Progress Summary

What has been done?o Pressure management successful in 13 settlements

including pressure reduction devices for 49 schoolso 1693 consumer meters auditedo 1775 meters fitted with automated meter reading deviceso 20 574 consumer meters replaced o 17 998 consumer meters re-located & fixed o 70 652 water connection leaks fixedo Added 95 more treated effluent users which accounts for

80.5Ml/d of treated effluent use.

Progress Summary

– More than 50 000 households visited with Integrated Leaks Repair Project

– 341 Caretakers trained to date– 41 Schools visited and leaks repaired– 160 Hlonipha Amanzi workshops with 14 813 participants– Water By-laws awareness campaigning – 5 workshops, 12

shopping mall promotions, Industry and commerce interventions

What has been done? (cont)

Budget & Expenditure

Budget & Expenditure

Budget & Expenditure

To answer the question one needs to do an

assessment of water savings and growth

projections

Savings Realised

Impact of the Strategy depends on:1. The actual savings realised through the Strategy

Including abating demand growth

2. Unconstrained growth in water demand

What demand would have been if we have done

Savings Realised

Demand Projections

Demand Projections

Impact of WC/WDM Year new supply augmentation will be

neededLWR HWR

No WC/WDM 2016 2008Sustaining efficiency from restrictions

2020 2013

10 yr WC/WDM Strategy 2051 2026

WC/WDM Strategy Table 10-6

Demand Projections

Demand Projections

Achievement of Targets

Achievement of Targets: Goal A-NRW

Achievement of Targets: Goal A-NRW

YearBulk NRW Reticulation NRW Overall NRW

As % of bulk water treated

2006/7 3.59% 15.77% 19.36%

2007/8 7.58% 12.64% 20.22%

2008/9 6.89% 16.42% 23.30%

2009/10 8.19% 17.17% 25.37%

IWA Balance 2009/10: Units Ml/day

Achievement of Targets: Goal A-NRW

0102030405060708090

100

2007

/08

2008

/9

2009

/10

2010

/11

2011

/12

2012

/13

2013

/14

2014

/15

2015

/201

6

2016

/201

7

Ml/

day

Expected and Reported Savings - Goal A

Expected Savings

CCT Reported Savings Achieved

Achievement of Targets: Goal B-Wastage

Reducing wastage to less than 2% of demand

No data to measure savings…

Achievement of Targets: Goal E-Reducing Growth Rate

0

10

20

30

40

50

60

70

2007

/08

2008

/9

2009

/10

2010

/11

2011

/12

2012

/13

2013

/14

2014

/15

2015

/201

6

2016

/201

7

Ml/

day

Expected and Reported Savings - Goal E

Expected Savings

Reported Savings Achieved

Achievement of Targets: Goals C & D

Qualitative targets requiring a qualitative assessment

Achievement of Targets

Most significant findings:• Population growth rate used might be too

low (1.61% (CCT) vs. 3.49% (StatsSA) • Use of uniform cost for unit leakage can be

improved

Achievement of Targets

Conclusion

• CCT has done what the Strategy said and more in the past three years and needs to continue with similar monitoring and evaluation processes.

• As expected significant savings have realised and projects and actions re WC/WDM need to continue with even more resources committed.

• Concern identified– demand growth still higher than expected

• 2 questions that need answers:

Conclusion

“Yes”, on the savings that have been verified

and “possibly” on savings yet to be

verified

Conclusion

“YES” if the strategy is re-aligned and even more

support is given to achieve this

Way Forward – 5 Steps

• STEP 1: Accuracy of bulk meters needs to be verified and confidence intervals given

• STEP 2: Report NRW according to IWA Water Balance. Improve accuracy of estimated components of the IWA water balance

• STEP 3: Understand why the growth rate in potable water demand so much higher than expected. Define (and quantify if possible) parameters influencing demand growth.

Way Forward – 5 Steps

• STEP 4: Revise projected growth demand and re-align strategy targeted savings. Involves extensive resource planning . Do cost-benefit model that answers augmentation planning objectives optimising cost-benefit options. Revise the current method of unit demand reduction for unit cost.

• STEP 5: Establish annual independent monitoring and assessment of strategy target achievements, and align it with the DWA toolkit

THANK YOU!

ANY QUESTIONS?