Post on 17-Jan-2016
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?