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3rd NRW Reduction Training, VietNam. 1

The views expressed in this paper/presentation are the views of the authorand do not necessarily reflect the views or policies of the Asian DevelopmentBank (ADB), or its Board of Governors, or the governments they represent.ADB does not guarantee the accuracy of the data included in this paper and

accepts no responsibility for any consequence of their use. Terminologyused may not necessarily be consistent with ADB official terms.

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3rd Non-Revenue Water (NRW)

Reduction Training course

Dhaka Water Supply &Sewerage Authority,Bangladesh.

Presenters

6 Md. Bazlur Rahman

6 Md. Mahmudul Islam

6 Kyaw Sha Ching

6 Md. Abdul Karim Patwary

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Selection of site for DMA

6

Located at Khilgaon Taltola in Dhaka city 6 No. of households: 650 +.

6 No. of connections: 675+

6 No. of Population: 24,000.6 Door to door survey is now in progress

6 Area: 65 hectors

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Description of existing network

6

200mm PVC pipes: 1300m.6 150mm PVC pipes: 2000m.

6 100mm PVC pipes: 500m.

6 100mm Asbestos Cement pipes: 400m.6 Total existing network: 4.2km.

6 Length of spaghetti pipes (for household connections) : 1500m.

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The map of Dhaka city

DMA-1

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The DMA area.

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Description of existing network

�

200mm PVC pipes: �150mm PVC pipes:

�100mm PVC pipes:

�100mm Asbestos Cement pipes:

The DMA area.

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The DMA

area.

Inflow-01

Inflow-02

Inflow-03

Inflow-04

Inflow-05

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http://slidepdf.com/reader/full/d2-dwasa 9/263rd NRW Reduction Training, VietNam. 9

Work plan for establishment of first DMA

Preparatory works Activities

Problem analysis Done

Organizing a team Done

Deployment of Junior Engrs. Done

Ensure logistics Done

Guide, train & performance monitoring On going

Target: Jan, 09 – Dec, 09

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Work plan for establishment of first DMA (Cont’d)

Water Usage Study Activities

Community awareness activities On going

Inventory of network Done

Hydraulic assessment Not yet done

Develop as-built drg. of existing networks DoneInstalling flow meters, valves & monitoringtools

Done


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Water Usage Study Activities

Isolation of total targeted area Done

Zero pressure test Done

Inventory & analysis of service connections On going

Develop baseline data On going

Customer data collection On going


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Rehabilitation works Activities

Assessment of volume of works On going

Prepare cost estimates and tender

documents

On going

Selection of Contractors Within 2 months

Improvement of existing system incl.rehab. of spaghetti lines Within 4 months

Replacement of spaghetti lines Within 4 months


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Water Loss Reduction Program Activities

Identify leaks, repair; again improvepressure and then repair

Not yet done.

Improve in-house plumbing Not yet done.

Replacement of domestic meters Within 5 months

Pressure monitoring Within 5 months

Flow monitoring Within 5 monthsWater Balance & NRW Calculations Within 5 months

Evaluate the result & reporting After completion


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Water Loss Reduction Program Activities

Presentation of the findings To be continued

Routine maintenance of improved

system

To be continued


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The existing water supply scenario

6 The quantity of water is insufficient with very low

pressure6 The customers use jet-pumps to draw water from

networks

6 The quality of water is not safe for drinking6 The customers use to boil water for drinking

6 House connections are leaky at the meter &

connection point – poor workmanship

6 Customers are reluctant to pay the water bill

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The objectives of improvements

6 To supply sufficient water on 24-hr basis under

reasonable pressure6 To ensure the good quality of water

6 To reduce the NRW by reducing physical &

commercial losses6 To enhance customers Willingness to Pay

6 To benefit the customers by eliminating the use of

jet-pumps and need to boil water

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The mass awareness campaign

6 A leaflet was circulated in the area describing the

benefits of establishing DMAs6 Many formal & informal meetings held in the offices,

mosques & customers’ houses

6 The customers were requested to cooperate duringthe household surveys & other physical works.

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The physical & socio-economic surveys

6 After collection of the existing maps & data an

extensive survey of the network was carried out6 Customers’ households were surveyed to obtain

information on – a) Functioning / accuracy of meters,

b) Status of bill payment & c) Status of houseconnections

6 Other socio-economic information

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The problems in designing & establishment ofDMA

6 There are 5 nos. of inflow points & 1 source of supply(Production Well) – more gate valves & bulk meters

6 In some cases, there are 2 parallel lines – difficult to manage

flow and pressure6 In most cases, the pressure is very low

6 House connections & meters are placed at high depths –difficult for reading meters

6 Houses at distances (30m -100m) took connections throughlong spaghetti lines

6 Around 80% houses pumps water through jet-pumps

6 In 50% houses, there are no under-ground reservoirs – pumps

water directly to overhead reservoirs.6 Most of connections are leaky (use of MS clamps)

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The flow rates at the inflow/ outflow points

6 There are 5 nos. of inflow points & 1 source of supply(Production Well) – more gate valves & bulk meters6 Inflow-1 (Production well): 3800 m3/day – only inflow

6 Inflow-2: Inflow comes from outside when Production well isnot operated – a bypass to be installed

6 Inflow-3: At present it is closed. In future may be used as aninflow.

6 Inflow-4: Only Inflow (860 m3/day).

6 Inflow-5: Only Outflow (360m3/day).

� All bulk meters match with the size of pipes.� All bulk meters are mechanical type.

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Thank you.

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3rd NRW Reduction Training VietNam 26

D2-DWASA

Documents

Transcript of D2-DWASA