Management of Non Revenue Water & Leakage detection - Delhi Jal Board

Presented By: Sourav Daspatnaik

CEO Swach Environment Pvt Ltd, A Srei Initiative

25, February 2019 London

NWS has been awarded 15 year contract for 24x7 water supply at Nangloi area in Delhi; Total project cost of INR 6640 Mn.

Nangloi Water Services Pvt. Ltd.

Swach Environment Pvt. Ltd.

Veolia India Pvt. Ltd.

49% - INR 301.3 Mn. 51% - INR 313.7 Mn.

Lenders Bank of India – INR 1000 Mn. Srei Infrastructure Finance Ltd. –

INR 844 Mn.

Statutory body providing grant funding Delhi Jal Board (DJB) – INR 4180 Mn.

(Grant + Escalation)

Equ

ity

inve

sto

rs

Project Structure

Design-Built-Finance-Operate-Transfer (DBFOT) contract for 24x7 water supply

INR 100 Mn. = USD 1.41Mn.

Delhi State Boundary

Delhi State Boundary

NWS

PPP Model To enhance the water service in Nangloi WTP command area

Project Area (1/2)

Project Area (2/2)

PROJECT AREA : 129 SQM (8.6% OF ENTIRE DELHI)

POPULATION : 1.5 MILLION (8% OF ENTIRE DELHI)

3.17

5.91 31.31

1200 mm dia

1500 mm dia

600 mm dia

900 mm dia

1000 mm dia

1200 mm dia

900 mm dia

12.11

Raw Water main from Bawana RWPH

WTP Nangloi

Mohan Garden UGR

Najafgarh UGR

Ujwa UGR

Daulatpur UGR

Bodella UGR

Fish Market BPS

CT-2 Dwarka UGR

Nangloi UGR

To Nangloi Area

To Mundka Area

1.43

4.95

0.96

0.68

10.39

3.35

42.79

8.59

0.76

0.00

1.29

2.75

0.86

1.77

0.5

Hydraulic Flow Layout- Total concession area

New UGR

Illegal and unauthorized water connections from DJB water lines in network and no network colonies

High non revenue water ( 79 % in 2013)

Reluctance of residents to take legal connection

Reluctance of consumers for installation of water meters

Unknown existing pipe network layout

Local public hindrance in isolating the area. (Fear if the area will be isolated, water will not reach to their houses)

Political hindrances

Water theft & leakages

Improper operation and production management

Narrow streets- difficulty in laying/replacing the HCS/pipelines

Old HSC & poor condition of pipe line network

To carry out capex work for laying new pipe lines with heavy traffic

Acceptance of A private operator as A water service provider 6

Challenges Faced In Nangloi PPP Area

Extended unauthorized water connections

Challenges faced in Nangloi PPP Area

On site : Pipe Laying at Delhi Metro Area

Scenario at Take Over Stage – Network Health

LEAKAGE THROUGH HSC NORMAL PRACTICE OF REPAIR

POOR QUALITY OF SADDLE GI PIPE BELOW GL

Corroded Existing Gi Water Connections

PE pipes - Use of Medium Density Polyethylene pipe for HSC and HDPE pipes for distribution Network

Technical Innovation In PPP Project

Technical Innovation In PPP Project

ELECTRO-FUSION SADDLE APPROPRIATE SADDLES TO PROVIDE HOUSE SERVICE CONNECTION ON PE PIPE LINE, STANDARD EN 12201-3 / ISO 4427 .

Technical Innovation In PPP Project

• Good quality of materials (Body – Ductile Iron, Strap – Stainless Steel with Epoxy coating, nut bolt- Brass) which guarantees a life time equal to those of the pipes and are also anti corrosive.

• Reduced risk of leakage – No metal to metal

contact due to insertion EPDM bush. • Perfect stability on pipe, whereas ferrules

prone to bend and leak, where pipe laid at shallow depth due to surplus /traffic load.

Technical Innovation In PPP Project

Levels Description

Level 1 Project Area Boundary

Level 2 CS Zone

Level 3 DMA

Level 4 Sub DMA

Level 5 Step Test for localized leaks

A Top Down approach provides better and faster understanding of the network

DMA Size should be reduced only if NRW figures are unacceptable, as it cost huge amount of money and manpower to create an isolated DMA

NRW % At the time of allotment of Contract : 81% NRW % At present : 60%

NWS DMA Strategy

Nangloi WTP

Dwarka WTP

X

Level 1 – Project Area

Dwarka WTP

Nangloi WTP

Level 2 – CSC Zone

Level 2 – CSC Zone

19

Level 3 – Flow Meter Plan (Priority 1)

Level 4 – SUB DMAs

• Further Reduces Study Area

• Close Isolation Required

• State Of The Art Hydraulic Model Helps In Planning

• Field Investigation In Leakiest Area To Find Leakages

• Unauthorized Connection Prior Estimation Helps A Lot

• Consumer Survey

Level 5 – Step Test Area Level 5 – Step Test Area

• Erection Of Flow Meter Level Wise

• DMA Establishment In All Respect Be It Flow Meter Installation Or Connection

Replacement/Installation Etc.

• Campaign With Help of Social welfare Team (SWT) And NRW Team

• Reaching Out To More No Of Peoples And Convincing Them To Take The

Connections.

• DJB’s Support In Law Enforcement

• Regular Issuing Of Challans, Notices Etc.

• Finding Leakiest DMA And Leakage Detection Team

NRW Reduction and Awareness Drive

24 x 7 call center fully operational

Toll Free Help Line No: 1800-30000-136

Mail ID: customer.care@nws-india.com

Complaint Registration Facility

Bulk SMS Facility

All Customer Service Centers and Call Center

operation under CCTV surveillance

Availability of Complaints Desk

24/7 Customer Service

24

Sh. Raghuvinder Shokeen (MLA, Nangloi) Sh. Sukhbir Dalal (MLA, Mundka)

Sh. Mahender Yadav (MLA, Vikas Puri) Sh. Naresh Balyan (MLA, Uttam Nagar)

Closely Review by Area MLAs

25

Sh. Gulab Singh (MLA, Matiyala)

Sh. Kailash Gahlot (MLA, Najafgarh) Sh. Sukhbir Dalal (MLA, Mundka)

Sh. Mahender Yadav (MLA, Vikas Puri)

Closely Review by Area MLAs

2

6

Closely Review by Area MLAs

27

20000 + Illegal Connections Regaularized

Issued Challan/Fines against Illegal Connections

2

8

Publicizing about various Schemes Launched by Delhi Govt /DJB

2

9

Organized 100+ Camps

Awareness Camps Regarding New HSC Schemes & last mile leakages

3

0

3

1

Photo-Billing Using Mobile Application

• A top down approach provides better and faster understanding of the network

• Consumer survey should be strategically done to cover all potential consumers, future consumers and

potential source of water loss

• Network maps and DMA boundaries are dynamic things, there should be a proper update cycle

• Field networks get updated frequently

• DMA pressure balance is not a stable thing, it needs to be controlled by hydraulic changes, various

changes may be expected while working on live setup.

• DMA does not reduce NRW, it just point out towards revenue holes

• efforts should be towards making all potential consumers in DMAs as authorized consumers

• DMA size should be reduced only if NRW figures are unacceptable, as it cost huge amount of money

and manpower to create an isolated DMA, sometimes, consumers suffer.

• Condition monitoring of network

What is Good Enough?

Sourav Daspatnaik Chief Executive Officer Swach Environment Pvt. Ltd. Tel: + 91 33 6606 7856 Email: sourav.daspatnaik@swachenv.com

34

SUPPLEMENTARY SLIDES

The difference between volume of water supplied into a system and the volume billed is termed as non revenue water

• Billed

• Unbilled 1. Authorized Consumption

• Apparent

• Real 2. Water

losses

Non Revenue Water

International Water Association – Delhi Jal Board methodology

Type of losses Component Actions recommended

Real losses

Speed and quality of repair

Ensure that once the leak is detected it is sent to O&M team for repair and repair is executed in short term. Put a target of 5 days and decrease target slowly.

Ensure repair of leak has been done properly in order to increase lifetime of asset and reduce risk of leakage again.

Active leak detection

Use the most effective way to detect invisible leaks.

Do “intensive” leak detection in order to reduce time of apparition of new leaks. The idea is to do iterative leak detection in one area after each round of repair. Once level of leak found is low, we can assume network is stabilized. And it allows us to reduce time of leakage between 2 detections.

Do step tests ??

Create a patrolling team to detect visible leaks and semi- visible leaks (visible only opening meter boxes, valve chambers, manholes, etc..)

Pressure management

Optimize the pumping regime in order to reduce supply during no or low consumption hours

Install pressure modulation valves in order to modulate the pressure to the need of customers and without damaging the network.

Asset Management

Make diagnostic of the assets in order to define optimized rehabilitation programs.

Define priorities of pipe, HSC, accessories replacement or extension.

Ensure standards of works and material

Ensure quality of works

NRW Actions – Physical losses

• WALKOVERSURVEY

• SURVEY THROUGH EPL

• UPDATION OF MAPS

• UNDERSTANDING THE NETWORK

• PRESSURE AND FLOW MEASUREMENT

1. NETWORK

STUDY

• APPROX. IDEA OF ACTUAL DEMAND/CONSUMPTION ASSESED

• REGULAR METERING OF CONSUMER METERS

• INSTALLATION OF DEDICATED PUMPS

2. DEMAND & SUPPLY STUDY

• INSTALLATION OF BOUNDARY VALVES

• INSTALLATION OF NRV (NON RETURN VALVE) ON TUBEWELLS

• CHECKING OF NRV IN THE NETWORK

3. ISOLATION OF NETWORK

Pre-evaluation and Action Plan before actual NRW Analysis

• DETECTION OF VISIBLE & INVISIBLE LEAKS

• POTENTIAL LEAK POINTS ARE OLD GI PIPES ,VALVES , HSC , SOCKET , T-JOINT ETC.

• REPAIRING VALVES / NRV

• PIPE CONDITION ASSESMENT

• REPAIRING ALL VISIBLE /IN-VISIBLE LEAKS

• INSTALLATION OF FLOWMETER /BULKMETER

• CHECKING ILL-LEGAL/UNKOWN CONNECTIONS

• STEP TEST TO INVESTIGATE NRW AND LOCATION OF PRESSURE DROP

4. LEAK DETECTION

6.REDUCING NRW & METERING

5. REPAIR & MAINTENANCE

Continuous monitoring & vigilance

Performance Indicators for

NRW

Volume of NRW as

percentage of system Input

Volume Volume of NRW as a

percentage of the annual

cost of running the water

system

Volume of apparent

Losses per service

connection per day

Real Losses as percentage of System Input

Volume

Normalized real losses –

m3/service connection/day

Unavoidable Annual Real

Losses (UARL)

Performance indicators for NRW by IWA/ AWWA