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Department of Water Affairs
Water Requirements and Availability Reconciliation Strategy for Mbombela
Municipal Area
Water Conservation and Water Demand Management Component
30 April 2013
• To make more effective and efficient use of the existing and available water resources by all water use sectors in the study area;
• To develop realistic water saving targets for the respective water use sectors and quantify the impact on current and future water requirements in the study area;
• To enable the Catchment Management Agency (CMA) and the Department of Water Affairs (DWA) to “free-up” additional water, which can be put to beneficial use in the public interest;
Objectives
• To conserve water and avoid or delay the implementation of further expensive schemes for transfers and storage which may not be necessary if water is used efficiently; and
• To provide necessary information to support the implementation of compulsory licensing and related water allocation reforms.
Objectives…
System
Input
Volume
Authorised
Consumption
RevenueWater
Non
Revenue
Water
BilledAuthorised
Consumption
UnbilledAuthorised
Consumption
ApparentLosses
RealLosses
Water
Losses
Billed Metered Consumption
Unbilled Unmetered Consumption
Unauthorised Consumption
Customer Meter Inaccuracies
Leakage on Transmission andDistribution Mains
Billed Unmetered Consumption
Unbilled Metered Consumption
Leakage on Service Connections up to point of Customer Meter
Leakage and Overflows at Storage Tanks
Free basic
WCWDM Key Performance Indicators
Environmentally and financially
unattractive
Water security
and efficiency
Efficiency and financial viability
Efficiency and Non-revenue water
System Input
Volume=
400 ℓ/c/d
Revenue Water
Non-Revenue
Water= 20%
System Input
Volume=
40 ℓ/c/d
Revenue Water
Non-Revenue
Water
80%
Low non-revenue water butinefficient water use
High non-revenue water butvery efficient water use
Augmentationnot recommended
Augmentationa possibility
System Input
Volume=
400 ℓ/c/d
Revenue Water
Non-Revenue
Water=
40%
High non-revenue water andinefficient water use
Augmentationnot recommended
Strategy Targets– Efficiency
• Target 180 to 200 litres per capita per day• Impacts on water security and next augmentation
– Non-revenue water• >50% target 40%• 30% to 50% target 25%• <30% target 15%• Impacts on revenue and water use efficiency
– Water losses• Same as NRW with unbilled consumption not more than 5% of
system input volume• Financially and environmentally not acceptable
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15
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Mbombela TargetsIndicator Current
ValueRealistic Target
Optimistic Target
System Input volume (million m3/a) 54.71 48.87 43.03
System Input volume (Mℓ / day) 149.79 133.80 117.80
Billed Authorised Consumption (million m3/a) 26.73 28.62 29.07
Unbilled Authorised Consumption (million m3/a) 8.90 8.27 6.47
Water Losses (million m3/a) 19.08 11.98 7.49
Non-revenue Water (million m3/a) 27.98 20.25 13.96
% Non-revenue water 51% 41% 32%
% Water Losses 35% 25% 17%
Input Volume (litres / capita / day) 277 247 218
Input Volume (m3 / household / month) 32 29 26
Authorised Consumption (litres / capita / day) 180 187 180
Authorised Consumption (m3 / household / month) 21 22 21
Target Summary
AreaNRW (%) Water Losses (%) Efficiency (l/c/d)
Current Realistic Target Current Realistic
Target Current Realistic Target
Nelspruit 27% 20% 22% 15% 723 614
White River 37% 30% 32% 25% 470 423
Karino 15% 15% 10% 10% 137 137
Matsulu 80% 60% 40% 30% 292 248
Hazyview 55% 40% 48% 30% 485 413
Nsikazi North 60% 50% 33% 25% 179 170
Nsikazi South 60% 50% 45% 30% 235 211
Mbombela 51% 41% 35% 25% 277 247
InterventionsINSTITUTIONAL / LEGISLATIVE INTERVENTIONS• Institutional review• Training and education • Customer charter, policy, bylaws
FINANCIAL INTERVENTIONS• Effective metering and billing • Water tariffs • Informative billing
SOCIAL INTERVENTIONS• Consumer Awareness Campaign • Consumer Help and Support Desk • Schools awareness
TECHNICAL INTERVENTIONS• Bulk metering • Sectorisation • Active Leakage Control • Valve audits• Leak and logging equipment • Telemetry • Retrofitting and removal of wasteful
devices • Mains replacement • Pressure management • Control valve management • Consumer metering • Top consumer audit • GIS / CAD system • Management Information System • Water loss monitoring and audits
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Recommendations• Setup task group (political, technical, finance) to meet
on monthly basis to discuss WDM issues – losses, billing, leak repairs, etc.
• Fill vacancies, training & capacity building• Focus on record keeping and management
information• Comply with legislation, regulations and RPMS• Resolve intermittent supply• Review tariff structures• Fix all visible and private leaks
WCWDM Regulations under WSAR509 of 2001
• Reg (3) Community awareness and customer service
• Reg (3) and (4) – Eradicate intermittent supply• Reg (10) – Water audit as part of WSDP• Reg (11) – Water balance and sectorisation• Reg (12) – Repair of leaks• Reg (13) – Consumer metering• Reg (15) – Pressure management
Way forward• Improve management information• Adopt strategies and business plans• Include budgets in IDP• Implement WC/WDM programme• Report to Water Affairs on
– Key performance indicators– Actions– Successes and failures– Plan Do Check Act
THANK YOU
Irrigation: Overall conclusions
• Irrigated agriculture in the Mbombela Municipal area is generally under serious threat due to a number of key factors including:– Reducing assurance of supply due to growing erosion of
available water resources to other sectors– Reducing water quality– Rapidly escalating pumping (electricity) costs which are
effectively forcing higher levels of water use efficiency.– Low morale in the agricultural sector (affecting investment
and productivity).
Irrigation: Overall conclusions…
• Consequently the irrigation sector is unlikely to be willing to further reduce its supplies through water trading.
• Cutting back on unlawful water use is one way of making more water available to legitimate users, or for further licence allocations.