Westmoreland - National Water Commission

Transcription

WATER SUPPLY PLANS
WESTMORELAND
1
Draft Westmoreland WS PPLan – Octobwe 12 2011
1. Introduction
Westmoreland is located at the south western side of Jamaica; the major towns are Negril, Little
London, Grange Hill, and the capital Savanna-la-mar. It has an area of 807 square kilometres
(311 square miles), making it Jamaica's eighth largest parish. There are over 10,000 acres (40
km²) of morass land, the largest part of which is called the Great Morass. The remaining area
consists of several hills of moderate elevation, and alluvial plains along the coast.
There are numerous rivers in the parish, of which the Cabaritta River, which is 39.7 kilometres
long, is the largest. Other rivers include the Negril River, New Savanna, Morgan's, Gut,
Smithfield, Bowens, Bluefields, Robins, Roaring, Great and Dean.
2. Existing Water Supply System
There are 22 water supply facilities in the parish and these are served by 16 springs, 4 wells and
2 river supplied water treatment plant.
Water Resource
Surface Water
The main surface water sources in Westmoreland are:
Roaring River
Venture River
Cabarita
Sweet River
Water Supply Systems
The total installed water production capacity in Westmoreland is just under 8 mgd. The major
systems in the parish are the Roaring River and Bullstrode Water Supply Systems, which have a
combined installed capacity of 5 mgd. The other supply systems in the parish include the
Bluefields, Williamsfield, Carawina and Cave systems.
(a)
The water treatment facilities in the parish are in need of upgrading to improve service
reliability.
(b)
The water supply network throughout the parish is aged and undersized, contributing
to very high levels of non-revenue (NRW), estimated to be some 72%. The total length of
the pipelines in the parish is estimated at 1, 280 kilometres. Information on the supply
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network is presented in table 2.1 below. It would be noted that pipelines sized 4 inches
(100mm) or less constitute almost 85% of the total length of the pipe network.
Table 2.1 – Summary Information on Westmoreland Pipe Network
Pipe
Diameter
(inches)
<2
2
3
4
6
8
10
12
>12
Approximate
Length (m)
98,361
368,327
265,734
349,918
107,586
54,478
14,988
15,138
5,410
1,279,940
Portion of the
Network
7.7%
28.8%
20.8%
27.3%
8.4%
4.3%
1.2%
1.2%
0.4%
3. Non-Revenue Water Levels
Set out in figure 3.1 is the annual water balance for Westmoreland. This was derived from the
water balances that were prepared for each of the water supply systems in the parish. The water
balances are based on flow measurements that were conducted at sections of the water supply
network and examinations of customer and records.
It would be noted that the average annual water production in the parish is approximately 12.73
million cubic meters (2.8 billion gallons). Physical losses amount to 8.17 million cubic meters per
year (1.8 billion gallons), which represents some 64% of the water produced. Commercial losses
amount to 1.04 million cubic meters (0.23 billion gallons) per year (8.2% of production), largely
attributed to unauthorized consumption
Revenue water in the parish is only 3.52 M cubic meters (0.77 billion gallons) per year which is
just below 28% of the water produced.
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Figure 3.1 - Water Balance for Westmoreland
Billed Authorized
Consumption
Home
3,523,645 m3/year
Authorized
Consumption
3,567,422 m3/year
Error Margin [+/-]:
0.0%
Unbilled Authorized
Consumption
43,776 m3/year
Error Margin [+/-]:
0.0%
System Input Volume
Billed Metered Consumption
3,516,205 m3/year
Revenue Water
Billed Unmetered Consumption
7,440 m3/year
3,523,645 m3/year
Unbilled Metered Consumption
0 m3/year
Unbilled Unmetered Consumption
43,776 m3/year
Error Margin [+/-]: 0.3%
Unauthorized Consumption
12,729,811 m3/year
Commercial Losses
995,164 m3/year
Error Margin [+/-]:
5.0%
828,550 m3/year
Customer Meter Inaccuracies and Data Handling Errors
Water Losses
Error Margin [+/-]:
20.8%
166,614 m3/year
Non-Revenue Water
9,206,165 m3/year
Error Margin [+/-]:
6.9%
9,162,389 m3/year
Error Margin [+/-]:
6.9%
Physical Losses
8,167,225 m3/year
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4. Water Requirement
Parish Population
General
Using information supplied by the Statistical Institute of Jamaica, in 1991 the population in
Westmoreland was 128,364. By 2001 it had grown to 138,948, showing a growth of 0.08%. The
estiamted population is in year 2010, 152,531 persons.
There are some 16,800 service connections in the parish which translates to a service coverage of
about 45% of the parish population.
Demand Centres
The enumeration districts (EDs) that were used in the 2001 population census was used to
establish priority areas that will be targeted to be provided with water supply. EDs with
population densities in excess of 150 persons per square kilometres were grouped to form these
demand centres.
Figure 4.1 – Example of Demand Centres and Information available on NWC’s GIS
Pipeline
TYPES OF DATA
Subdivision
Enumeration
District (ED)
- Population Data
WATER DEMAND CENTRES
Light Blue Shaded EDs
-Pop > 150p/sq Km
-Priority given to fully supply
Pump
Station
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As far as possible, each demand centre (DC) is linked to a water supply system. It is related to a
water distribution system that now serves it or has the potential to be served by it.
Set out in table 4.1 is information showing the population in each Demand Zone, indicating
projections for 2015, 2020, 2025, and 2030.
Table 4.1 – Population Projections
Demand Zones
Population
2010
Jerusalem Mountain
2015
2020
2025
2030
5,976
6,219
6,472
6,735
7,008
Roaring River #1
44,067
45,858
47,721
49,661
51,680
Roaring River #2
23,504
24,459
25,453
26,488
27,565
Bluefields
16,814
17,497
18,208
18,948
19,718
3,783
3,937
4,097
4,263
4,436
529
550
572
596
620
2,226
2,316
2,411
2,509
2,611
20,683
21,523
22,398
23,309
24,256
1,090
1,135
1,181
1,229
1,279
118,670
123,494
128,513
133,737
139,172
Williamsfield
Carawina
Cave
Bulstrode
Petersville
TOTAL
The population of 118,670 persons in the Demand Zones in year 2010 represents 78% of the
estimated 2010 parish population of 152, 531 persons
Current Water Requirement
The current water supply situation is summarised below in table 4.2 below
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Table 4.2 – Current Water Supply situation
WESTMORELAND - YR 2010
Supply Zone
Supply Into Population
Calculated Demand (Mg/d)
Surplus/
the System
to be
Deficit
Domestic Commercial Technical Total
(Mg/d)
Served
and other Losses
Reqmnt
Jerusalem Mountain
Roaring River No. 1
Roaring River No. 2
Bluefields
Williamsfield
Carawina
Cave
Bulstrode
Petersville
Total
0.03
5,976
0.24
0.09
0.02
0.35
(0.32)
1.00
44,067
1.76
0.69
0.64
3.09
(2.09)
4.30
23,504
0.94
0.37
2.75
4.06
0.24
1.00
16,814
0.67
0.26
0.64
1.57
(0.57)
0.84
3,783
0.15
0.06
0.54
0.75
0.09
0.47
529
0.02
0.01
0.30
0.33
0.14
0.18
2,226
0.09
0.03
0.12
0.24
(0.06)
2.20
20,683
0.83
0.32
1.41
2.56
(0.36)
0.07
1,090
0.04
0.02
0.04
0.10
(0.04)
10.09
118,670
4.75
1.85
6.46
13.05
(2.96)
The table shows that there is an overall supply deficit of 2.96 million gallons per day when the
combined water requirement of Demand Zones is considered along with the water supplied in
the parish. The total loss due to leaks is estimated to be 6.46 million gallons per day.
Water Requirement in 2030
If the level of technical losses remains at the current, the water supply deficit will increase to
some 6.17 mgd in the maximum day in 2030. Maximum day is taken as 120% of the average
water demand. See Table 4.3
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Table 4.3 – Water Supply Situation in 2030 – No Reduction in Technical Losses
Tables 4.4 and 4.5 reflect the water supply situation in 2015 and 2030 respectively, if efforts
are made to reduce the technical losses to at most 30% of production, and if system inputs
are returned to design parameters or better. With these improvements there are resulting
surpluses in approximately 67% of the supply systems, with Jerusalem Mountain, Roaring
River, Bluefields and Petersville Water Supply systems showing a deficit.
Table 4.4 – Water Supply Situation in 2015 (Technical losses reduced to 30% of production)
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WESTMORELAND - YR 2015 - Technical Losses Reduced to 30%
Supply Population
Into the
to be
Domestic Commercia Technical Total
System
Served
l and other Losses
Reqmnt
(Mg/d)
losses
Supply Zone
Jerusalem Mountain
Roaring River
Bluefields
Williamsfield
Carawina
Cave
Bulstrode
Petersville
Total
Surplus/
Deficit
0.05
6,219
0.30
0.14
0.02
0.45
(0.40)
7.00
70,317
3.38
1.58
2.10
7.05
(0.05)
1.23
17,497
0.84
0.39
0.37
1.60
(0.37)
1.26
3,937
0.19
0.09
0.38
0.66
0.60
0.47
550
0.03
0.01
0.14
0.18
0.29
0.24
2,316
0.11
0.05
0.07
0.24
0.01
2.60
21,523
1.03
0.48
0.78
2.30
0.30
0.08
1,135
0.05
0.03
0.02
0.10
(0.02)
12.93
123,494
5.93
2.77
3.88
12.57
0.36
Table 4.5 – Water Supply Situation in 2030 (Technical losses reduced to 30% of production)
WESTMORELAND - YR 2030 - Technical Losses Reduced to 30%
Supply Population
Into the
to be
Domestic Commercia Technical Total
System
Served
l and other Losses
Reqmnt
(Mg/d)
losses
Supply Zone
Jerusalem Mountain
Roaring River
Bluefields
Williamsfield
Carawina
Cave
Bulstrode
Petersville
Total
Surplus/
Deficit
0.05
7,008
0.34
0.16
0.02
0.51
(0.46)
7.00
79,244
3.80
1.78
2.10
7.68
(0.68)
1.23
19,718
0.95
0.44
0.37
1.76
(0.53)
1.26
4,436
0.21
0.10
0.38
0.69
0.57
0.47
620
0.03
0.01
0.14
0.18
0.29
0.24
2,611
0.13
0.06
0.07
0.26
(0.01)
2.60
24,256
1.16
0.54
0.78
2.49
0.11
0.08
1,279
0.06
0.03
0.02
0.11
(0.03)
12.93
139,172
6.68
3.12
3.88
13.68
(0.74)
5. Water Supply Improvement Plans
5.1 Introduction
It is planned to undertake a number of water supply improvement works in Westmoreland to
address supply deficiencies and to improve overall operational efficiencies. The planned works
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will focus on reducing the high level of technical losses (estimated to be in excess of 64% of
production), largely due to the aged water supply infrastructure; strengthening the transfer
capacities of critical water transmission mains, to enable transfer of water within and between
water supply systems and facilitating supply flexibility between water supply systems; and
water supply extensions to areas that are not now been served.
A comprehensive audit of the water supply systems in the parish will be undertaken in early
stages in order to identify optimal steps that should be taken to deliver early gains in the
reduction of NRW. This will include establishing district metered areas (DMAs) and setting up
monitoring systems.
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5.2 Summary of Proposed Projects and Cost
Supply Zone
Jerusalem Mountain
Project Cost $
178,560,376.32
Roaring River
1,282,604,226.24
Bluefields
1,032,886,140.00
Williamsfield
650,711,531.20
Carawina
168,516,633.60
Cave
153,426,545.20
Bulstrode
794,036,726.88
Petersville
75,459,000.00
Total
4,336,201,179.44
Detailed Audit of the Westmoreland Water Supply System
The level of NRW in the parish is high, as shown in the previous sections. It is planned to carry
out a programme of activities to target areas to reduce overall NRW in the parish. A detailed
audit of the water supply system will be undertaken as well as a comprehensive survey of users
– legal and illegal.
In order to proceed with the audit of the network and to obtain reliable and accurate
information on users and consumption, the following activities will be undertaken during the
Audit Phase:
Technical Areas:
•
•
•
•
Network survey to define and locate pipes (material and size) & fittings (valves, PRV,
fire hydrants) to draw up the network inventory. Then all the information gathered on
site will be transferred in Geographic Information System (GIS) following the NWC
specifications.
Investigation of all the NWC facilities (production facilities, reservoirs and pumping
stations). All defects and anomalies detected and remedial works for repairs and/or
upgrading have must be clearly stated for every facility.
Flow & pressure measurements as well as level measurement of reservoirs at production
facilities, on the trunk mains and various off-takes.
Leak detection campaign on the entire network and mapping of leaks detected to further
decide for pipe section replacement.
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•
•
•
Establishment and set-up of network models complying with the network operation and
measurements carried out.
Network partition into District Metering Area (DMA) to monitor flows and NRW
control with definition of equipment (valves and bulk meters) to be installed.
Setting-up of pressure management program including evaluation of existing pressure
zones and Pressure Reducing Valves (PRV) and definition of new pressure areas with
location for new equipment.
Commercial Areas:
•
•
•
•
“Door to Door” Consumer survey audits to ascertain specific elements of the water
supply among the residential & commercial users: to locate the NWC users (mapping
under GIS), to check the status and condition of water meters installed on site, to gather
other relevant information regarding the supply and to find out illegal connections.
CS analysis to check the reliability and accuracy of the NWC database, to analyze trends
of consumption and users and to establish the initial billable consumption.
Consumption profiles measuring campaign to analyze the apparent losses engendered
by the customer metering policies and thereof to optimize the invoicing /revenues of
NWC by defining new metering policies for domestic and commercial users.
Specific investigation on site to check the discrepancies between the CS database and the
field, mainly for the temporary and permanent disconnected accounts as well as for the
accounts with zero/low consumption.
Cost of Audit
The total cost to undertake the proposed set up and audit of the Westmoreland water
supply system is $92M. A breakdown is provided in the table below.
Activity
1
Estimated
Cost ($M)
20
2
Network Survey (including leak
detection/Pressure Survey and
Management
Establishment of DMA
3
Customer Mapping and audits
10
80
50
Sub-Total
4
Administrative and Other Cost
12
TOTAL
92
Expected Benefits
The detailed audit of the Westmoreland Water Supply system will provide information that will
be used to help in defining detailed NRW reduction intervention activities. The results of the
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audit will be used to target the most critical sections of the parish water supply system that
require attention and assist in scheduling of the required works.
Expected Benefits (cont’d)
The information will be used to populate the asset database for the parish which will form a
critical part of the Asset Management System (AMS) that will be established for St. Elizabeth. A
fully functional AMS will be a valuable operational tool that can be used to sustain the benefits
that will be derived from the various projects and activities that are set out in this document.
Package A
This includes the rehabilitation of the Roaring River plants, the upgrade of distribution lines in
Savanna-la-mar, the installation of a 250,000 gallon tank at Williamsfield, and the extension of a
6” line through to Wakefield on the Carawina system. These projects are expected to improve
supply to the central regions of the parish. The details are as follows:
Jerusalem Mountain Demand Zone (W-2)
System Description
The Jerusalem Mountain Water Supply System is provided with water from the Jeruselem
Spring which has a capacity of some 0.03 mgd
Service Area
Some of the communities supplied by this system include Jerusalem Mountain, Rock Spring,
Meylersfield Mountain and Herring Pie.
Water Requirement
The current population in the DC in Westmoreland that is served by the Jerusalem Water
Supply System is estimated at 5,976 persons and this is expected to increase to 7,008 persons by
2030. There is a now a supply deficit 0.3mgd and this is expected to increase to 0.5 mgd if no
water supply improvement works are undertaken.
Addressing the Supply Deficiencies
The water supply from the Jerusalem Mountain source is grossly inadequate to meet the water
needs of its service area. The distribution mains in the area are asbestos cement type and break
frequently.
It is planned to augment the Jerusalem Mountain water supply system with water from the
Bulstrode Water Supply System in order to address the existing and projected supply shortfalls.
13
This will have to be done in parallel with the expansion of the production capacity of the
Bulstrode Water Treatment Plan.
It is planned to replace the asbestos cement pipelines within the supply area.
14
Figure – Proposed Water Supply Improvement Works
Cost for Improvements
The estimated total cost for the improvement works is $ 178.6M as shown below.
Activity
Qnty
Install 3.3 Km 6" DI pipeline from Grange Hill to Glasgow
Install 3.2 Km 4" line take-off at Glasgow to Jerusalem
Mtn.
3,300
3,200
$57,927,592.80
$54,383,212.80
Cost ($)
Upgrade 2 Km of pipeline along Glasgow main road to 4"
2,000
$33,989,508.00
Install booster pump at Glasgow
$2,500,000
Engineering & Other Cost
$29,760,062.72
TOTAL
$178,560,376.32
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Roaring River Demand Zone (W-1)
System Description
The Roaring River Water Supply System is supplied by water from the Roaring River. There are
two water treatment plants associated with this system, the Roaring River Water Treatment
Plant No. 1 and the Roaring River Plant No. 2.
Service Area
Some of the communities supplied by this system include Roaring River, Petersfield, Amity,
Carawina, Hertford, Torrington, Georges Plain, Frome, Dumbars River, Savanna-la-mar,
Smithfield, Strawberry H/S, Galloway, Lindos Hill, Hatfield, Roaring River, Whithorn,
Caledonia
Water Requirement
The current combined population in the DC in Westmoreland that is served by the Roaring
River No. 1 and Roaring River No. 2 systems is estimated to be 67,570 persons and this is
expected to increase to 79,244 persons by 2030. There is a current supply deficit of 1.85 mgd and
this is expected to increase to 3.67 mgd in the maximum day if the level of technical losses
remain at current levels.
Efforts will be made to reduce the level of technical losses on the this Water Supply system and
to rehabilitate and upgrade the water treatment capacities of the treatment plants. The proposed
works will involve:
•
Extensive rehabilitation and upgrading of the Roaring River No. 2 water treatment plant
to improved treatment capacity and increase output to 6.5 mgd. Rehabiliation works
will also be carried out on the Roaring River No. 1 Water Treatment Plant.
•
Construction of some 2.2km of 500mm transmission pipeline from Peterfield to Hartford
water tank to replace the aged and leaking one that forms a part of the supply system.
•
Repairs to the existing 0.5 million gallon tank at Hartford to reduce leaks.
•
Construction of a 0.5 million water tank at Hartford to increase storage capacity at that
location to 1 million gallons
•
Upgrade transmission pipeline to 14" between Dumbar's River and Mannings
intersection.
•
Replace and upgrade old and leaking distribution pipelines in Sava-la-mar area. This
will allow for the extension of service from Roaring River to the wider Sav-la-mar area
16
including Little London, New Hope and Retreat. This will relieve dependence on the
Bulstrode Water Supply system.
•
General rehabilitation to appurtenances - air valves, isolating valves, etc.
17
The estimated total cost for the improvement works is $ 1.3B as shown below.
Activity
Qnty
Install 2.2km 20" line from Petersfield to tank at Hartford
2,200
Construct 500,000 gallon tank at Hartford
Cost ($)
$122,288,905.20
$72,000,000
Install 1 Km 14" line at Dunbar's Corner to Mannings
intersection
1000
$32,317,194.00
Replace distribution lines in Savanna-la-mar
6,000
$300,000,000.00
Extend 250mm line 2 Km from New Hope to Retreat
2,000
$63,713,580.00
Rehabilitate and install network appurtenances: air
valves, boundary valves, conrol valves.
$5,000,000.00
Rehabilitate and upgrade Roaring River WTP No.1
$30,000,000.00
Rehabilitate and upgrade Roaring River WTP No.2
$200,000,000.00
Replace defective lines by installing 10 Km 6" DI from
Little London to Grange Hill
10,000
$175,538,160.00
Replace defective 4 Km 4" DI lines in Little London town
4,000
$67,979,016.00
Sub-Total
$1,068,836,855.20
$213,767,371.04
TOTAL
$1,282,604,226.24
Economic Assessment
18
Bluefields Demand Zone (W-2)
System Description
The Bluefield Water Supply System is supplied with some 1 mgd, through a supply network
that has a high level of technical losses.
Service Area
Some of the communities supplied by this system include Bluefields, Belmont, Black Bay, Farm,
Culloden, Whitehouse, South Sea Park, Mearnsville, Gordon.
Water Requirement
The current population in the DC in Westmoreland that is served by the Bluefield Water Supply
System is estimated to be 16,814 persons and this is expected to increase to 19,718 persons by
2030. There is a current supply deficit of 0.36 mgd and this is will increase to 1 mgd. Activities
to reduce the technical losses will improve the supply situation.
The major trunk main that runs along the Bluefield main road through to Whitehouse/Scott's
Cove is leaking badly and breaks frequently. Over the last 12 months repairs at least ten major
leaks have had to be carried out on it. The National Works Agency Plans to carry out a major
road upgrading work from the Scotts’s Cove through to Whitehouse. It is planned to replace
this main to avoid problems with leaks and breaks when the road work is completed.
Replacement of the pipelines would see reduced leaks, increased carrying capacity, improved
service delivery and reduced Non-Revenue Water due to leakages.
In addition, it is proposed to augment the deficit by piping in additional supply from
Dalintober.
19
The estimated total cost for the improvement works is $ 1.03b as shown below:
Activity
Qnty
Cost ($)
Install 17Km 250mm DI pipeline from Bluefields to Scotts
Cove
17,000
$541,565,430.00
Install 6km 10" line from tank at Fustic Grove to Scott's
Cove, and appurtenances
6,000
$191,140,740.00
Upgrade 3km of line from Relift pump to Fustic Grove
tank to 8", and appurtenances
3,000
$66,597,804.00
Install pump relift station
$25,000,000.00
Install storage tank 50,000 gallons
$12,500,000.00
Install 5km 6" distribution line
TOTAL
5,000
$87,769,080.00
$108,313,086.00
$1,032,886,140.00
20
21
Williamsfield Demand Zone (W-2)
System Description
The Williamsfield Water Supply System is supplied by water from the Williamsfield production
facility which has a capacity of some 1.3 mgd
Service Area
Some of the communities supplied by this system include Williamsfield, Fort William,
Strawberry, Grange, Glenbrook.
Water Requirement
The current population in the DC in Westmoreland that is served by the Williamsfield Supply
Systems is estimated to be 3,783 persons and this is not expected to increase to 4,436 persons by
2030. There is a current supply marginal supply surplus and this is expected to reverse to
marginal deficit in 2030 if no improvement work is done. An aggressive programme to reduce
the level of technical losses to 30% by 2015 will provide a surplus of some 0.3 mgd
There is one pump at this facility making the system vulnerable to supply disruptions. A duty
and a standby pump need to be in place. The sump at the station is inadequate, leading to
inconsistent and unreliable supply.
It is planned to carry out the following works:
•
Construct a 250,000 gallon tank at Williamsfield (pipes are already in place); water will
be pumped to this tank and then gravity fed to areas such as Grange, Strawberry,
Friendship, Ft William, Heartford.
•
Complete the installation of distribution mains from Flower Hill to Blauwearie and
Barham communities. A 50,000 gallon tank and pumping station is to be installed.
•
Replacement distribution mains will be installed to serve Strawberry adjacent areas
22
The estimated total cost for the improvement works is $ 650M as shown below:
Activity
Qnty
Cost ($)
Installation of 250,000 gallon and 50,000 gallon
tanks
Install 4km of 4" secondary main as upgrade to
existing 2" main Strawberry to Friendship
Upgrade existing tank to 50,000 gallons at
Strawberry
Construct a lift station at Mayfield and Install
standby pump at Williamsfield pumping station
Provision for distribution mains extension
2
$312,500,000.00
4,000
$67,979,016.00
$18,000,000.00
$58,000,000.00
7,000
$122,876,712.00
$77,555,803.20
TOTAL
$650,711,531.20
23
Carawina Demand Zone (W-2)
System Description
The Carawina Water Supply System is supplied by water from the Carawina Springs which has
a capacity of some 0.5 mgd
Service Area
This system supplies Carawina and Torrigton.
Water Requirement
The current population in the DC in Westmoreland that is served by the Carawina Water
Supply System is estimated to be 529 persons and this is expected to increase to 620 persons by
2030. There is a current supply, surplus of 0.14 mgd and this is expected to remain that way if
the service area is unchanged. Activities to reduce the technical losses will improve the supply
situation.
The water from Carawina is therefore available to augment supply to adjacent systems such as
the Roaring River and Petersville systems.
It is planned to extend the Carawina Water Supply System to serve additional areas such as
Paradise and Wakefield.
24
The estimated total cost for the improvement works is $ 168.5M as shown below:
Activity
Qnty
Cost ($)
Install 8 Km of 6" DI line and control devices
8,000
$140,430,528.00
$28,086,105.60
TOTAL
$168,516,633.60
Cave Demand Zone (W-2)
System Description
Some 0.24 mgd of water is supplied to the Cave Water Water Supply.
Service Area
Some of the communities supplied by this system include Cave, Cave Mountain, Red Gate,
Water Wheel, Ferris, Scott Hill
Water Requirement
The current population in the DC in Westmoreland that is served by the Cave Water Supply
System is estimated to be 2,226 persons and this is expected to increase to 2,611 persons by 2030.
There is a current marginal supply deficit of about 0.06 mgd and this is to increase to 0.12 if
supply conditions in area are not changed.
The level of service within the supply area varies, with some sections experiencing intermittent
supply. The protection about the area of the source is to be strengthened to ensure its continued
use.
Pressure zones within the supply system are to be re-established to minimize high pressures
which can lead to frequent main breaks.
25
The pipeline from the pump station to the tank is to be replaced and the replacement pipeline
dedicated to supply this tank. The water from the tank will then be distributed to the service
areas. This provides improved supply control and will facilitate the use of off peaking pumping
to minimize electricity cost.
The estimated total cost for the improvement works is $ 135.8M as shown below.
Cost for improvements
The estimated total cost for the improvement works is $ 153M as shown below:
Activity
Qnty
Install 5.5 Km 6" transmission line from pump station to
reservoir (along roadway)
5,500
Rehabilitate 2"/3" distribution pipeline and install 3
PRV's
Upgrade 1.5 Km distribution line to 4" DI including PRV
Provision for replacement of distribution mains in supply
area
Construct security fencing around supply source
TOTAL
Cost ($)
$96,545,988.00
$5,000,000.00
1,500
$25,492,131.00
2,000
$19,490,000.00
$1,500,000.00
$5,398,426.20
$153,426,545.20
26
27
Bulstrode Demand Zone (W-2)
System Description
The Bulstrode Water Treatment plant provides some 2.2 mgd of water to the supply system.
The treatment capacity is limited and reduced throughput is necessary during extreme turbid
conditions. The water supply infrastructure is over 40 years old, leaks in many sections and is
subject to frequent main breaks.
Service Area
Some of the communities supplied by this system include Grange Hill, Burnt Savanna, TollGate, Alma,Paul Island, Fullerfield, Little London, Glasgow, Jerusalem Mountain, Herring
Piece, Part of Rock Spring, New Broughton
Water Requirement
The current population in the DC in Westmoreland that is served by the Bulstrode Water
Supply System is estimated to be 20,683 persons and this is expected to increase to 24,256
persons by 2030. There is a current supply deficit of 0.36 mgd and this is expected to increase to
0.9 mgd by 2030 if the existing condition is unchanged.
The proposed activities include the rehabilitation of the Bulstrode Water Treatment Plant to
improve its treatment capacity and service reliability. In addition, it is planned expanded the
plant to 3 mgd and thereby provide an additional 0.8 mgd for the supply system. These
proposed works should return the facility to a surplus position.
The water supply network is in urgent need of renewal and it is planned to commence this by
replacing critical transmission mains and selected sections of the water distribution network.
28
The estimated total cost for the improvement works is $794M as shown below:
Activity
Rehabilitation and upgrade of treatment plant to allow
for increased output of2.5 - 3MIGD
Install 500,000 gallon tank at suitable commanding
elevation
Upgrade 2.8 Km distribution line from Bulstrode P/S to
Grange Hill to 12" DI
Upgrade 4.5 Km distribution line from Grange Hill Little
London to 8" DI.
Upgrade 16 Km distribution lines in Little London to 4"
TOTAL
Qnty
Cost ($)
$120,000,000.00
$100,000,000.00
2,800
$89,884,502.40
4,500
$99,896,706.00
16,000
$271,916,064.00
$132,339,454.48
$794,036,726.88
29
Petersville Demand Zone (W-2)
System Description
The Petersville Water Supply System is one of the small systems in the parish, providing some
0.06 mgd.
Service Area
Some of the communities supplied by this system include Petersville, Long Hill, Fustic Grove,
Kings Well Road
Water Requirement
The current population in the DC in Westmoreland that is served by the Peterville Water
Supply System is estimated to be 1,090 persons and this is expected to increase to 1,279 persons
by 2030. There is a current supply deficit of 0.04 mgd and this is expected to increase to 0.07
mgd if the supply conditions in the area remain unchanged.
It is planned to augment the Petersville Water Supply System with water from the Black River
Water Supply System in the adjoining parish of St. Elizabeth to address the supply shortfall.
In addition, main replacement activities will be undertaken to reduce the level of technical
losses to at most 30% of production.
30
The estimated total cost for the improvement works is $ 75.5M as shown below:
Activity
Install 150mm transmission main to connect to Black
River WS
Provision for main replacement
Qnty
2,000
500
Cost ($)
20,010,000.00
4,872,500.00
Install 50,000 gallon tank
$12,500,000.00
Install lift pump
$25,500,000.00
$12,576,500.00
TOTAL
$75,459,000.00
31

Westmoreland - National Water Commission

Transcription

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