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    2.1 Facilities of Existing Water Supply Scheme

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    Lakmal Sooriyabandara
    The existing water supply scheme for Warakapola area uses Kuda Oya as its source and has a treatment plant with a capacity of 1,500 m3/day. It serves around 6,500 people through 1,626 connections across 7 divisions. The treatment process includes aeration, flocculation, sedimentation, filtration and chlorination. While some people receive pipe-borne water, many still rely on dug wells. The distribution system has pipes of various diameters totaling 28.7 km. However, the scheme faces problems as the treatment plant cannot be expanded and some areas cannot be reached due to small pipe diameters.

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    2.1 Facilities of Existing Water Supply Scheme

    Uploaded by

    Lakmal Sooriyabandara
    58 views3 pages
    The existing water supply scheme for Warakapola area uses Kuda Oya as its source and has a treatment plant with a capacity of 1,500 m3/day. It serves around 6,500 people through 1,626 connections across 7 divisions. The treatment process includes aeration, flocculation, sedimentation, filtration and chlorination. While some people receive pipe-borne water, many still rely on dug wells. The distribution system has pipes of various diameters totaling 28.7 km. However, the scheme faces problems as the treatment plant cannot be expanded and some areas cannot be reached due to small pipe diameters.

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    The existing water supply scheme for Warakapola area uses Kuda Oya as its source and has a treatment plant with a capacity of 1,500 m3/day. It serves around 6,500 people through 1,626 connections across 7 divisions. The treatment process includes aeration, flocculation, sedimentation, filtration and chlorination. While some people receive pipe-borne water, many still rely on dug wells. The distribution system has pipes of various diameters totaling 28.7 km. However, the scheme faces problems as the treatment plant cannot be expanded and some areas cannot be reached due to small pipe diameters.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    58 views3 pages

    2.1 Facilities of Existing Water Supply Scheme

    Uploaded by

    Lakmal Sooriyabandara
    The existing water supply scheme for Warakapola area uses Kuda Oya as its source and has a treatment plant with a capacity of 1,500 m3/day. It serves around 6,500 people through 1,626 connections across 7 divisions. The treatment process includes aeration, flocculation, sedimentation, filtration and chlorination. While some people receive pipe-borne water, many still rely on dug wells. The distribution system has pipes of various diameters totaling 28.7 km. However, the scheme faces problems as the treatment plant cannot be expanded and some areas cannot be reached due to small pipe diameters.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 3

    2 EXISTING WATER SUPPLY FACILITIES

    2.1 Facilities of Existing Water Supply Scheme

    At present there is a water supply scheme at Warakapola area maintained by National Water
    Supply & Drainage Board (NWSDB) which was built in 1996. Treatment plant of this scheme
    is designed for 1,200 m3/day capacity which uses Kuda Oya as the Source. Raw water quality
    of this source is monitored regularly. The raw water quality test results are shown in
    Chapter2 -Annex 1. At present the plant capacity has increased up to 1,500 m3/day with the
    increasing of the demand.
    Treatment plant consists of aeration, flocculation, sedimentation, filtration and chlorination.
    Existing water supply scheme covers about 6,500 populations through 1626 individual
    connections who live in 7 GN Divisions of Warakapola DSD.
    GNDs covered by the water supply scheme
    i. Kukulpana
    ii. Thumbaliyadda
    iii. Gamithapura
    iv. Warakapola
    v. Dummaladeniya
    vi. Ambepussa
    vii. Mahena

    2.1.1 Treatment Plant

    Coverage map of the existing Warakapola Water Supply System is shown in the Annex 1.
    As mentioned in the above paragraph, Kuda Oya is used as the main source. Addition to this
    source, a bore hole is also used as the source since the demand is very high. Water from the
    bore hole is extracted for 12 hours daily.
    Water from the bore hole is directly pumped to the aerator. It is a tray type aerator. From the
    aerator Fe2+, Mn2+, CO2, odour are removed.
    Surface water from Kuda oya is directly pumped to the flocculator since the surface water is
    aerated naturally. There are 2 chambers with volume of 3.3 m3 each and it has 8.2 seconds of
    retention time. Nominal flow rate of the flocculator is 62 m3/hr.
    Next, water is entered to sedimentation tanks. There are 2 tanks with a volume of 58 m3 each. It
    has a horizontal flow with a velocity of 62 m/hr.
    Water from sedimentation tank (surface water) and aerator (ground water) are then feed the
    pressure filters. It has a 3m diameter and 1m height. There are two pressure sand filters and
    vertical flow rate of these filters are 31 m3/hr.

    3
    Then lime and chlorine are added to the water coming from the pressure sand filters. There is a
    450m3 capacity chlorine contact tank with a nominal flow of 62 m3/hr.
    Then treated water goes to a ground clear water sump with a capacity of 70m3. Then water is
    directly pumped to a water tank with a capacity of 450 m3.

    2.1.2 Transmission and Distribution system

    There is a 160mm diameter 500 m pipe line from intake of Kuda Oya to treatment plant. From
    Bore hole to treatment plant, there is a 750 m length 100 mm (Φ)DI .
    Distribution system is 28.7 km long. Respective lengths of relevant diameters are as following
    Table 2.1.
    Table 2.1 Pipe details of the existing distribution system
    Pipe Diameter Pipe material Length
    63 mm PVC 4,900 m
    90 mm PVC 3,500 m
    110 mm PVC 11,200 m
    150 mm DI 233 m
    160 mm PVC 7,500 m
    200 mm DI 118 m
    225 mm PVC 1,200 m

    There are 17 section valves, 12 air valves and 11 washout valves in the existing Warakapola
    water supply system.
    Operation and maintenance staff of the existing Warakapola water supply system is as
    following table 2.2.
    Table 2.2: Staff of Warakapola WSS
    Staff No. of people
    OIC 1
    Pump Operator (shift) 3
    Meter Reader 1
    Labour 2

    Treated water quality of existing water supply scheme is shown in Chapter 2- Annex 2.

    4
    2.2 Present Water use Practices

    Though there is a water supply scheme all the people are not using pipe borne water in the
    served area. Their water usage practice is different one into each other. Table 2.2 shows the
    water usage practice of the served GNDs of the existing Warakapola Water Supply Scheme.

    Table 2.3 Present Water use practices in served GNDs of Existing Warakapola WSS
    GND GN Division Total Pipe Dug Well Other
    No Families born
    92 Kukulpane 549 75 466 8
    92C Thumbaliyadda 396 92 226 78
    92B Ganithapura 885 358 502 25
    92A Warakapala 1,017 187 830 -
    94C Dummaladeniya 261 78 514 29
    83A Ambepussa 911 28 883 -
    83B Mahena 713 282 431 -
    Total 4,672 1,100 3,432 140

    2.3 Problems Encountered with Existing Water Supply

     Capacity of the existing treatment plant cannot be increased due to insufficient yield of
    existing water sources.
     Distribution system cannot be expanded due to small diameter pipes.
     Some elevated areas cannot be supplied from the existing scheme.

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