Water Conservation and Water Demand Management 30 October

Water Conservation and Water Demand Management 30 October 2019

Content 1. Background 2. Water Supply Key Statistics 3. WC/WDM Strategic Interventions 4. WC/WDM Financial Implications 5. Estimated Savings from WDM Interventions 6. Three (3) Year Analysis of Total SIV 7. Regional Total Bulk Supply 8. Progress on WC/WDM Interventions 2

1. Background § Johannesburg Water (JW) developed a WC/WDM strategy in 2008 which was intended to be implemented over a 10 year period. § This strategy was then accelerated in 2014 due to the strain that the water demand had on the water supply and further revised during August 2016. § The 2008 strategy mainly focused on direct measurable interventions like pressure management, mains replacement, active & passive leak detection and retrofitting & removal of wasteful devices. § The 2016 revised strategy continue to focus on direct measurable intervention but also now increase focus on bulk metering, consumer meter replacement, schools/hostels retrofitting and water demand management tariffs. § Implementation of WC/WDM resulted in a saving of 63, 700 Ml over the 8 year period. 3

2. Water Supply Key Statistics q WC/WDM focuses on all 6 operational regions q Population (Census 2011) = 4. 3 Million q Total Water reticulation = 11 800 km q Total reservoir and Tower = 89/35 q System Input Volume (SIV) from July 18 – June 2019 = 588 411 295 Kl/annum q Average Daily Consumption = 1 612 086 Kl/day 4

3. WC/WDM Strategic Interventions Initiative Identified activities to achieve the initiatives Bulk Metering Replace and repair existing bulk meters to enable zone water balance, install check meters downstream of RW meter to ascertain bulk metering accuracy. Leak Detection/MNF Active leak detection and smart control of night water pressure. Pressure Management Establish new PRV zone to reduce static network pressure to below 90 meter. Consumer Meter Replacement and large meter Audit Replace all consumer meter older that the average of 11 years to reduce apparent losses. School Analysis Hostel Analysis to identify billing anomalies and high consumers Hostels has been identified as large water consumers due to high number of internal leaks Pipe Replacement Analyze pipe burst incident and replace pipes based on age and pipe material Retrofitting and removal of wasteful devices Retrofitting and replacement of wasteful devices in private properties, secondary mains replacement, installation of Prepayment Meters. Community education and awareness campaigns Educate communities on water saving tips and WCWDM initiative. 5

4. WC/WDM Financial Implication 6

5. Estimated Savings from WDM Interventions Parameter Initiative Apparent Losses (meter replacement and auditing). Commercial Loss Estimated Saving (Mℓ/annum) 5, 843 Unauthorized connections. Data Transfer Errors. 10, 808 Leak Detection and MNF reduction. 15, 500 Pressure Control (PRV implementation). 7, 066 Pressure Control (PRV refurbishment). 2, 300 Real Losses School Retrofitting. 724 Commercial & Real Loss Retrofitting & Removal of wasteful devices (Eldorado, Orange Farm, Ivory Park, Alexandra and Westbury/ Noordgesig). 30, 446 7

6. Three (3) Year Analysis of Total SIV Analysis indicates an increase of 5. 47% in total consumption between the current period (Oct. 2018 – Sep. 2019) and the previous period (Oct. 2017 – Sep. 2018), also an increase of 1. 78 % between (Oct. 2016 – Sep. 2017) and (Oct. 2017 – Sep. 2018). The year on year total SIV and AADD for the 3 -year period under review are as follows: Oct. 2016 – Sep. 2017 : 553 948 944 Kl : AADD = 1 517 688. 34 Kl/day Oct. 2017 – Sep. 2018 : 563 802 376 Kl : AADD = 1 544 664. 04 Kl/day Oct. 2018 – Sep. 2019 : 594 615 721 Kl : AADD = 1 629 084. 17 Kl/day 8

7. Three (3) Year Analysis of Total SIV (Cont…) Figure 1: Three year SIV and projected demands 9

7. Regional Total Bulk Supply Johannesburg Central, Soweto, Deep South and Midrand Regions have registered an increase in consumption as compared to the same period last year. Sandton and Randburg Regions have registered a decrease consumptio in comparison to the same period last year. Table 1 below depicts total SIV per region and percentage moveme analysis. 10

8. Current WC/WDM Interventions § § § To date, JW has managed to replace a total of 221. 7 km of water network in various areas across the city against a cumulative target of 269. 5 km. This represents 82. 3% of the cumulative 5 -year target. Repairs of four (4) leaking reservoirs in Soweto (Aeroton, Jabulani reservoir and tower and Jabulani reservoir and tower). The scope entails Repairing wall cracks and floor joints, replacement of by-pass pipework and remedial work to the internal lining. Replacement and refurbishment of 13 large gate valves: Soweto. Retrofitting and removal of wasteful devices Soweto, Orange Farm and Alexandra. Water infrastructure renewal and metering Alexandra. Soweto Water Infrastructure Upgrade (Orlando West, Orlando East and Diepkloof). Creation of water control zones at Orange Farm. Routine Repairs and maintenance activities. Routine repairs and maintenance activities at Alexandra. Active leakage control: 7 500 km for 2019/2020 Financial Year. Advanced pressure management at areas experiencing high MNF e. g. Orange Farm, Noordgesig, 11 Slovovile and Oakdene. Refurbishment and Replacement of inlet/outlet bulk reservoir meters.

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