BRAIN STROMING MEET ON WATER MANAGEMENT ORGANISED BY IMD,CHENNAI CHAPTER

NEED FOR INTER STATE COOPERATION IN SOLVING WATER CRISIS OF CHENNAI CITY

R.Subramanian Chairman, Cauvery Technical Cell Cum Inter State Waters Wing, WRD,PWD,. 3.8.2019 CHENNAI METROPOLITAN AREA

CHENNAI Spread over Chennai, Kanchipuram and METROPOLITAN Thiruvallur districts. AREA (CMA) 1189 sq.km Chennai Corporation, 8 Municipalities, 11 Town Panchayats and 179 Village Panchayats ( 10 Panchayat unions).

CHENNAI 426 sq.km. CORPORATION WATER DEMAND

Sl. No Year Population Water Demand In lakhs MLD

1 2010 85 2 2015 97 1136 3 2020 110 1721 4 2035 154 2522 5 2050 157 3746 South-West and North-East Monsoon Rainfall from 2008 to 2018 -

1800 1600 1400 1200 1000 800

600 Rainfall in mm in Rainfall 400 200

0

2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 Year SWM Rainfall-Actual NEM Rainfall-Actual SWM Rainfall-Normal (439 mm) NEM Rainfall-Normal (790 mm)

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

1600 1400 1200 1000 800 600

Rainfall in mm in Rainfall 400 200

0

2010 2013 2016 2008 2009 2011 2012 2014 2015 2017 2018 Year SWM Rainfall-Actual NEM Rainfall-Actual SWM Rainfall-Normal (452 mm) NEM Rainfall-Normal (590 mm)

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

2000 1800 1600 1400 1200 1000 800

Rainfall in mm in Rainfall 600 400 200

0

2010 2008 2009 2011 2012 2013 2014 2015 2016 2017 2018 Year SWM Rainfall-Actual NEM Rainfall-Actual SWM Rainfall-Normal (491 mm) NEM Rainfall-Normal (642 mm)

6 Rainfall in the catchment area of City water supply Reservoirs (in mm) 30 years Year Actual % deviation Average 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

7 PRESENT WATER SUPPLY SOURCES A. SURFACE WATER

SL. RESERVOIR / TANK DESIGNED NO. CAPACITY (Mcft.) 1 Poondi 3231 2 1081 3 Red Hills 3300 ( lake) 4 Chembarambakkam 3645

5 Veeranam 1465 Total 12,722 9 Present Water Supply Sources (contd…)

B. THE VEERANAM WATER SUPPLY SCHEME

About 170 mld is supplied Source: Release from reservoir. C. GROUND WATER From Tamaraipakkam, , Punjetti, and Neyveli aquifer about 35 to 65 mld is being supplied.

Sea water has already intruded.

D. DESALINATION PLANTS Minjur (2010) 100 mld Nemmeli (2013) 110 mld Present water supply sources ( contd…..) E. KRISHNA WATER SUPPLY • 15 TMC is to be transferred from Srisailam Reservoir across the in A P to

• Maharashtra, 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. 12 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. 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. 14 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 and the need during deficit years new sources are to be identified and executed

Inter basin transfer is one possibility

17 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 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. Siruvani dam

20 LINKING GODAVARI WITH CAUVERY

GODAVARI (INCHAMPALLI/JANAMPET) – KRISHNA

(NAGARJUNASAGAR) - PENNAR (SOMASILA) -

ARANIYAR – PALAR- PENNAIYAR - CAUVERY

(GRAND ANICUT) - LINK PROJECT Godavari – Pennar – Cauvery Link Alternate Proposal (2019) Water to be diverted in TMC ft. Godavari Inchampalli Janampet Polavaram 247 80 Dowleswaram Barrage Krishna Nagarjunasagar Prakasam Vijayawada Barrage Pennar Somasila 83 AP – TN Border

Cauvery 46 Lower Coleroon Anicut Kattalai Upper Grand Barrage Anicut anicut 22

PROBABLE MONTH WISE FLOW EXPECTED AT ANDHRA PRADESH – TAMIL NADU BORDER

Month No. of Diversion at Janampet Water to be Days Barrage across received at of Godavari AP - TN supply 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) 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

GoI has to take up this linking scheme as a National Scheme and plan to execute the scheme early. 28