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ETHEKWINI WATER AND SANITATION
MILE NRW PRESENTATION 2014
JULY 2014
Contents
Quick EWS Stats Data from other Metros (MBI) EWS Status Quo Challenges Strategic Objectives IWA Best Practice Benefits of Monitoring Summary
• 3,6 million people
• 646 000 properties
• Supply 887 Ml/day of water from 9 Treatment Works
• Treat 500 Ml/d of Waste Water
• 263 Water Reservoirs
• 27 Waste Water Treatment Works
• 7 000 km of sewer mains
• 12 000km of water mains
• 480 000 water connections
• Combined annual expenditure of R6.1bn (2014/15)
• Municipal budget R34bn (2014/15)
eThekwini Municipality Quick Statistics
NRW Data from other utilities (June 2013)
System/TownNumber of
Connections
NRW by
VolumeILI
SIV
(kl/day)
eThekwini 477 849 37,3% 7,4 881 082
Msunduzi 79 032 46,6% 6,2 177 206
Ugu 47 210 30,8% 4,6 105 810
iLembe 32 437 62,3% 5,7 62 330
uMkhanyakude 47 432 81,0% 5,0 46 354
City of uMhlathuze 41 243 31,7% 6,9 110 037
South African Average 36,8%
African Average 39,0%
eThekwini Sales and Purchases
150000
200000
250000
300000
350000
400000
450000
500000
550000
600000
12000000
14000000
16000000
18000000
20000000
22000000
24000000
26000000
28000000
30000000
32000000
May-04 Apr-05 Mar-06 Feb-07 Jan-08 Dec-08 Nov-09 Oct-10 Sep-11 Aug-12 Jul-13 Jun-14
Nu
mb
er
of
Co
nn
ect
ion
s
Mo
nth
ly V
olu
me
s (k
l)
eThekwini Water and SanitationMonthly Volumes and Connections May 2004 to June 2014
eThekwini Water Sales Total SIV - Monthly
Total number of connections 12 per. Mov. Avg. (eThekwini Water Sales)
12 per. Mov. Avg. (Total SIV - Monthly)
Water Exported Billed Water
m3/day Exported
± x % Billed m3/day
Own Authorised ± x % Revenue
Sources Consumption Billed Metered Water
m3/day m3/day Consumption m3/day
± x % ± x % m3/day ± x %
Authorised ± x %
Consumption Billed Unmetered
m3/day Consumption
± x % m3/day
± x %
Unbilled Metered
Consumption
Unbilled Authorised m3/day
System Water Consumption ± x %
Input Supplied m3/day Unbilled Unmetered
m3/day m3/day ± x % Consumption
± x % ± x % m3/day
Imported ± x % Non-revenue
Water Unauthorised Water
m3/day Apparent Consumption m3/day
± x % Losses m3/day ± x %
Water m3/day Metering
Losses ± x % Inaccuracies
m3/day m3/day
± x % Mains Leaks
Real m3/day
Losses Reservoir Overflows
m3/day
m3/day Service connection
± x % Leaks
m3/day
IWA Water Balance
Challenges
• Tampering, vandalism and theft is a growing concern as infrastructure is damaged and looted
• Age of Infrastructure • Loss of Institutional Knowledge • Illegal and Unmetered connections • Budget • Social and Political Will
Umgeni River Bridge – The Before Picture
Umgeni River Bridge – Tuesday 10 June 2014
NRW Strategic Plan Objectives THE HISTORY
NRW by volume for 2008/2009 – 38.9% (ILI 8.8) NRW by volume for 2009/2010 – 37.5% (ILI 8.4) NRW by Volume for 2010/2011 – 33.2% (ILI 6.8) NRW by Volume for 2011/2012 – 35.4% (ILI 7.2) NRW by Volume for 2012/2013 – 37.3% (ILI 7.4) NRW by Volume for 2013/2014 – 39.8% (ILI 8.2)
Year
2012/13 2013/14 2014/15 2015/16 2016/17 2017/18 2018/19
Connections 477849 480833 497521 513934 530894 548387 570161
System Input Volume (kl/day) 881082 887547 897864 908532 919559 930952 942720
Billed Metered Consumption
(kl/day) 552407 577000 602000 627000 653000 680000 707000
NRW % 37,3% 35,0% 33,0% 31,0% 29,0% 27,0% 25,0%
THE TARGETS…
NRW Strategic Plan Objectives THE TARGETS
400000
500000
600000
700000
800000
900000
1000000
1100000
1200000
20
02
/03
20
03
/04
20
04
/05
20
05
/06
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06
/07
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07
/08
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/09
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/10
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/11
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/13
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/14
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/15
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/16
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/17
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/18
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/19
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/20
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/21
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/22
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/23
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23
/24
Eq
uiv
ale
nt
Ave
rage
Dai
ly D
em
and
(kl
/day
)
EWS NRW 12-Year ProjectionsWith and Without NRW Reduction Intervention
SIV - No Intervention BMC - No Intervention SIV - With Intervention BMC - With Intervention SIV - Ideal Funding
Phase 1a “System Assessment” • System knowledge • Identify problems • Quantify problems
• Identify cost-effective intervention
• Prioritize intervention
Phase 1b “System Optimisation”
• Maximize Operational Efficiency • Maximize Financial Efficiency
Minimize Losses Real Loss Control:
• Review of Service Supply
Standards • Infrastructure Improvements
• Optimal Zoning • Pressure Management
(fixed outlet optimisation) • Leak Detection and Repair
Apparent Loss Control:
• Meter Testing & Calibration
• Illegal Connections
Maximize Billed Consumption:
• Database population
accuracy • All occupied properties
have connections • Illegal connections • Customer category
• Cost recovery
“80/20”
Phase 2 “Future Intervention” • Real Loss Reduction
• Apparent Loss Reduction
Phase 3 “Sustainability”
• Preventative Maintenance • Active leak detection
• Water Balances • Reporting
Sewer Tariff impact
200000
210000
220000
230000
240000
250000
260000
Jul-
08
Sep
-08
No
v-0
8
Jan
-09
Mar
-09
May
-09
Jul-
09
Sep
-09
No
v-0
9
Jan
-10
Mar
-10
May
-10
Jul-
10
Sep
-10
No
v-1
0
Jan
-11
Mar
-11
May
-11
Jul-
11
Sep
-11
No
v-1
1
Jan
-12
Mar
-12
May
-12
Jul-
12
Sep
-12
No
v-1
2
Jan
-13
Mar
-13
May
-13
Jul-
13
Sep
-13
No
v-1
3
Jan
-14
Mar
-14
May
-14
Ave
rage
Dai
ly C
on
sum
pti
on
(kl
/day
)
eThekwini Water and SanitationAverage Daily ICI Consumption
July 2008 to June 2014
Total Non-Domestic
12 per. Mov. Avg. (Total Non-Domestic)
July 2010 - Sewer User charge intoduced
25 Ml/day sales decrease
IWA Best Practice to reduce Apparent / Commercial Losses
Current Annual Volume of Apparent
Losses
Economic Level of Apparent Losses
Unavoidable Annual
Apparent Losses
Policy and Enforcement
Water Accounting
ControlsD
ata Han
dlin
g C
on
trols
Cu
stom
er
Mete
r M
anage
me
nt
• Checking 187 Metro Housing projects for houses without connections
• Change out programme for ICI meters (19817) • Metering of all sprinkler and fire connections • Metering of all water into informal settlements • Pilot programme to meter houses in “blue” areas • Ensure Top 200 meters < 5 years old • Change out programme for domestic meters
older than 20 years (25 000 pa) • Repeated checking of 12000 properties where
connections were previously removed • Amnesty Programme commenced in 2010 and
prosecutions now taking place to tackle illegal connections
• 75 Custody Transfer Points upgrade and monitoring– Bulk water purchase from Umgeni Water. Top 12 sites account for 99% of volume purchased – R4m / day
Apparent / Commercial Losses
Current Annual Volume of Apparent
Losses
Economic Level of Apparent Losses
Unavoidable Annual
Apparent Losses
Policy and Enforcement
Water Accounting
Controls
Data H
and
ling
Co
ntro
ls
Cu
stom
er
Mete
r M
anage
me
nt
IWA Best Practice to Reduce Real Losses
Current Annual Volume of Real
Losses
Economic Level of Real Losses
Unavoidable Annual Real
Losses
Speed and Quality of
Repairs
Active Leakage Control
Pip
elin
e M
aterials
Man
agem
en
t
Pre
ssure
M
anage
me
nt
SIV Reduction – Real Losses Rezoning to new pressure standard
Advanced pressure management
Active PRV Maintenance
GSM based failure detection devices on
pressure reducing valves (100)
Advanced active leak detection on contract
Improve speed and quality of repairs.
61 people recently employed for a 12 month project for leak detection
Prevent reservoir overflows and improve reservoir integrity.
Current Annual Volume of Real
Losses
Economic Level of Real Losses
Unavoidable Annual Real
Losses
Speed and Quality of
Repairs
Active Leakage Control
Pip
elin
e M
aterials
Man
agem
en
t
Pre
ssure
M
anage
me
nt
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180
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Pre
ssu
re m
Flo
w m
3/h
DV3022 Representative Results from PRV Optimisation
Before Profile After Profile D/S Before D/S After
Reduction in Qadd = 494m3orApproximately R49 285 per month
Daily Volume Before: 2163.88 m3
Daily Volume After: 1669.52 m3
Pressure Management Example
Leak Detection Example
0
500
1000
1500
2000
2500
20
09
/12
/03
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/01
/22
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/29Fl
ow
rate
(kl/
hr)
Logging Period (05/01/2010 - 04/08/2010)
Umlazi 1 Real Loss Reduction
Flow Profile Monitoring
Theoretical Average Zone Pressure : 57m Theoretical Average Zone : 56m
5 PRV Settings Optimised
FEB/MARCH/APR/MAY = 1425 leaks found & repaired
FEB/MARCH/APR/MAY/JUNE = 1740 leaks found & repaired
FEB/MARCH/APR/MAYJUNE/JULY = 2007 leaks found & repaired
631.48kl/day 470.65kl/day 327.83kl/day 509.33kl/day 334.56kl/da
FEB/MARCH/APR/MAY/JUNE/JULY/AUG = 2440 leaks found & repaired
50mm 117 breaks/100KM
75mm 72 breaks/100KM
100mm 58 breaks/100KM
150mm 34 breaks/100KM
200mm 17 breaks/100KM
250mm 16 breaks/100KM
Whole system distribution main BF
Burst frequency per diameter
Statistics 2006
to 2010
Main
leaks
Service
Leaks UARL UARL BFI BFI
Year 100Km Per 1000 Mains/100
Services
/1000 Mains Services
2006 80 56 13 3 6,1 18,7
2007 89 52 13 3 6,8 17,4
2008 94 54 13 3 7,2 18,0
2009 96 61 13 3 7,4 20,4
2010 99 58 13 3 7,6 19,5
Average 91,7 56,4 13,0 3,0 7,1 18,8
Burst Frequency Analysis
• Pressure was increased to the CBD numerous pipe bursts resulted
Northern Aqueduct Failure
Durban CBD – Data and Lessons
FLOW DATA
Normal daily flow 28,7 Ml/day
Peak increased flow 10 Ml/day
Time to find and repair all leaks 9 days
Total water lost 52,3 Ml
Approximate cost of water lost R261 585
LESSONS LEARNED
The value of a monitoring and alarm system
The aging water mains are fragile and very susceptible to pressure increases. Fortunately, the reverse is also true.
Team Work makes the Dream Work
New approaches to the risks associated with vandalism/theft on strategic assets need to be found and implemented
NRW Capital Budgets
Project
Number 2014/15 2015/16 2016/17
Water loss X3289 R 65 000 000 R 55 000 000 R 65 000 000
Reservoir and district meters X5189 R 4 500 000 R 5 000 000 R 5 000 000
Prv Installation X5906 R 40 000 000 R 40 000 000 R 45 000 000
Advanced Control on Prv's X6216 R 4 500 000 R 4 500 000 R 4 500 000
Custody Transfer Meter Upgrade X6217 R 900 000 R 1 000 000 R 1 000 000
Domestic meters - Installation X4628 R 15 000 000 R 9 000 000 R 15 000 000
Blue Area Project (Flow limiter
upgrades) X6302 R 15 000 000 R 15 000 000 R 25 000 000
Bulk sales meters X4254 R 5 000 000 R 5 000 000 R 31 700 000
Total R 149 900 000 R 134 500 000 R 192 200 000
Water Meters (Material) R 9 000 000 R 10 000 000 R 10 000 000
Replacement of Water Pipes X4889 R 30 000 000 R 30 000 000 R 30 000 000
Summary The EWS programme has suffered a
number of setbacks of the last 3 years – you cannot slow down!
NRW is a complex challenge for us and all utilities
Unless improvement to social behavior is obtained targets will not be reached
NRW must be tackled on many fronts
Increased capex and opex is required for interventions
Monitoring the system has great benefit
Departments must not operate in “silos” and be mindful of impact of interventions
Thank you