R.Subramanian

Chairman, Cauvery Technical Cell Cum Inter State Waters Wing,

WRD,PWD,Tamil Nadu.

3.8.2019

BRAIN STROMING MEET ON CHENNAI WATER

MANAGEMENT ORGANISED BY IMD,CHENNAI CHAPTER

NEED FOR INTER STATE

COOPERATION IN SOLVING WATER

CRISIS OF CHENNAI CITY

CHENNAI METROPOLITAN AREA

CHENNAI

METROPOLITAN

AREA (CMA)

1189 sq.km

Spread over Chennai, Kanchipuram and

Thiruvallur districts.

Chennai Corporation, 8 Municipalities,

11 Town Panchayats and 179 Village

Panchayats ( 10 Panchayat unions).

CHENNAI

CORPORATION426 sq.km.

Sl. No Year Population

In lakhs

Water Demand

MLD

1 2010 85

2 2015 97 1136

3 2020 110 1721

4 2035 154 2522

5 2050 157 3746

WATER DEMAND

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YearSWM Rainfall-Actual NEM Rainfall-Actual

SWM Rainfall-Normal NEM Rainfall-Normal(439 mm) (790 mm)

South-West and North-East Monsoon Rainfall from 2008 to 2018 - Chennai District

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South-West and North-East Monsoon Rainfall from 2008 to 2018 - Thiruvallur District

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SWM Rainfall-Actual NEM Rainfall-Actual

SWM Rainfall-Normal NEM Rainfall-Normal(452 mm) (590 mm)

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South-West and North-East Monsoon Rainfall from 2008 to 2018 - Kancheepuram District

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SWM Rainfall-Normal NEM Rainfall-Normal (642 mm)(491 mm)

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Rainfall in the catchment area of City

water supply Reservoirs (in mm)

Year30 years

AverageActual % deviation

2012 1293 992 (-) 24

2013 1298 1065 (-) 18

2014 1286 1026 (-) 20

2015 1273 2155 (+) 69

2016 1308 837 (-) 36

2017 1306 1388 (+) 6

2018 1314 880 (-) 33

PRESENT WATER SUPPLY SOURCES

A. SURFACE WATER

SL.

NO.

RESERVOIR / TANK DESIGNED

CAPACITY

(Mcft.)

1 Poondi 3231

2 Cholavaram 1081

3 Red Hills

(Puzhal lake)

3300

4 Chembarambakkam 3645

5 Veeranam 1465

Total 12,722

9

Present Water Supply Sources (contd…)

C. GROUND WATER

From Tamaraipakkam, Minjur, Punjetti, and Neyveli

aquifer about 35 to 65 mld is being supplied.

Sea water has already intruded.

B. THE VEERANAM WATER SUPPLY SCHEME

About 170 mld is supplied

Source: Release from Mettur reservoir.

D. DESALINATION PLANTS

Minjur (2010) 100 mld

Nemmeli (2013) 110 mld

E. KRISHNA WATER SUPPLY

• 15 TMC is to be transferred from Srisailam

Reservoir across the Krishna river in A P to

Poondi Reservoir

• Maharashtra, Karnataka and A P agreed to

supply 5 TMC each from Krishna waters to

Chennai water supply, in 1976.

• In 1983 A P and T N entered into an

Agreement on the month wise schedule of

supply of Krishna Water to Chennai City

Water Supply.

Present water supply sources ( contd…..)

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E. KRISHNA WATER SUPPLY (Contd…)

• The length of the link canal from Srisailam reservoir

upto the inter-state border is about 380 km.

• The length of canal from Kandaleru Reservoir in

Andhra Pradesh to Poondi Reservoir is about 152

km.

• Allowing 3 TMC for transmission loss, 12 TMC is to

be ensured by Andhra Pradesh at the State

border, 8 TMC from July to October and 4 TMC from

January to April.

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E. KRISHNA WATER SUPPLY (Contd…)

COMMITTEES

A Liaison Committee has been constituted with the Chief

Secretaries and Engineers from both

Tamil Nadu and Andhra Pradesh, to discuss the issues

relating to the project. 45 Meetings have been conducted

till now.

Inter – State Commitee

Krishna River Management Board (KRMB) has

constituted a Committee under its Chairperson with

Engineers–in–Chief of Maharashtra, Karnataka, Andhra

Pradesh, Telangana and Tamil Nadu as its Members, to

ensure supply to Chennai city in 2018. 2 Meetings have

been conducted till now.

ON GOING SCHEMES

A. THERVOY KANDIGAI RESERVOIR

Launched in 2013

The waterbodies, viz., Thervoy Kandigai and

Kannankottai are linked to form a reservoir. It can store

about 1 TMC in a year.

From this Reservoir water will be conveyed through 66

km long pipeline to Poondi reservoir, from where it will

be used for drinking water supply.

On going schemes (contd…)

B. DESALINATION PLANTS

Location Capacity (Mld) status

Nemmeli 150 Construction commenced

in June 2019

Perur 400 Environmental clearance

obtained

FUTURE NEEDS

• Even after accounting the reuse of treated

sewage and other effluents, and Rain

Water Harvesting sources for meeting

future water needs of Chennai Metro and

the need during deficit years new sources

are to be identified and executed

Inter basin transfer is one possibility

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POLICY OF GoI

NATIONAL WATER POLICY 2012.

Drinking water is the first priority.

It emphasises transfer of water from

Surplus basin to deficit basin for

beneficial uses.

Cooperation from the basin States is

must for the successful implementation

of the National Water Policy.

INTER STATE COOPERATION

SIRUVANI WATER TO COIMBATORE CITY

An Inter State Agreement concluded in 1973

between Kerala and Tamil Nadu for the construction

of a Dam in the territory of Kerala to store 650 Mcft

of Siruvani water for providing water supply to

Coimbatore city. The Agreement is valid for 99 years.

Coimbatore Corporation gets 1.30 TMC annually

(100 MLD) from Siruvani Dam.

The project was taken up in 1977 and completed in

1983 with the cooperation of Kerala.

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Siruvani

dam

GODAVARI (INCHAMPALLI/JANAMPET) – KRISHNA

(NAGARJUNASAGAR) - PENNAR (SOMASILA) -

ARANIYAR – PALAR- PENNAIYAR - CAUVERY

(GRAND ANICUT) - LINK PROJECT

LINKING GODAVARI WITH CAUVERY

Godavari

Krishna

Pennar

Cauvery

Janampet Polavaram

80

Nagarjunasagar

Somasila

Kattalai

Barrage

Grand

anicut

Vijayawada

247

46

Water to be

diverted in

TMC ft.

Godavari – Pennar – Cauvery Link Alternate Proposal (2019)

83 AP – TN Border

Inchampalli

Prakasam

Barrage

Upper

Anicut

Lower Coleroon

Anicut

Dowleswaram

Barrage

22

Month No. of

Days

of

supply

Diversion at Janampet

Barrage across

Godavari

Water to be

received at

AP - TN

border

TMC (MCM) % TMC (MCM)

June 20 13 (360) 5.1 -

July 31 61 (1736) 24.8 25 (708)

August 31 68 (1930) 27.6 23 (652)

September 30 59(1674) 23.9 20 (566)

October 31 46 (1300) 18.6 15 (436)

Total 143 247 (7000) 100 83 (2362)

PROBABLE MONTH WISE FLOW EXPECTED AT ANDHRA

PRADESH – TAMIL NADU BORDER

COOPERATION FROM NEIGHBOURING

STATES

The Godavari – Cauvery link

scheme needs the cooperation of

Telengana, Andhra Pradesh and

other basin States of Godavari

river, namely, Maharashtra, Odisha,

Chattishgarh.

SUPPORT FROM

GOVERNMENT OF INDIA

GoI has to take up this linking

scheme as a National Scheme and

plan to execute the scheme early.

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