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Chennai Metropolitan Water Supply and Sewerage Board

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Chennai Metropolitan Water Supply and Sewerage Board CHENNAI METROPOLITAN WATER SUPPLY AND SEWERAGE BOARD POLICY NOTE - 2001-2002 The Chennai Metropolitan Water Supply and Sewerage Board was established on 01.08.1978, by an Act of the Tamil Nadu Legislature to address to the issues pertaining to water supply and sanitation in a holistic manner. 1. CHENNAI METROWATER'S MISSION, FUNCTIONS AND ITS GROWTH CMWSSB's Mission is to enhance the health and quality of life of the citizens of Chennai by providing them with adequate supply of clean and good quality water and by safe disposal of sewage/waste water at a reasonable price and to improve the environment. The FUNCTIONS of CMWSSB are promoting and securing the planned development of water supply and sewerage services Efficient operation maintenance and regulation of the water supply and sewerage systems in Chennai Metropolitan Area. Preparing the immediate and long term measures to meet the future demands of water supply and sewerage services in the Chennai Metropolitan area. At present it serves a population of about 60 Lakhs mostly in the Chennai City Area. The Chennai Metropolitan Water Supply and Sewerage Board has taken significant initiatives to supply adequate quantity of water with good quality and also to redress the grievances of the citizens within the minimum time possible. 2. MEASURES TAKEN TO TACKLE THE PRESENT GRAVE DROUGHT SITUATION AND THE ACUTE WATER CRISIS STORAGE IN LAKES The drinking water needs of the Chennai City are at present served mainly by 3 reservoirs in Poondi, Cholavaram and Redhills. These reservoirs normally get water during the North East Monsoon and also occasionally from the retreating South West Monsoon. Due to the near total failure of the North East Monsoon for the past two years, the storage levels in the reservoirs have come down considerably. 3. ACTION TAKEN TO MEET THE PRESENT WATER CRISIS 3.1. The status of city water supply and the Contingency plan for managing the acute water crisis was reviewed by the Hon'ble ef Minister in detail on 11.6.2001. In order to tackle the grave water situation and acute drought, it was decided to adopt a multipronged strategy with immediate measures to attend to the day-to-day needs and long term measures for a permanent solution to the water problem facing Chennai city. 3.2. Accordingly, various steps have been taken by Metrowater to meet the drinking water requirements in Chennai City and the proposed contingency plan envisaged the transportation of water from distant sources by road/rail and augmenting ground water supply by hiring agricultural wells. Apart from this, steps have been taken to install additional stationary tanks for defective streets and erection of additional filling points have also been taken up to streamline and quicken mobile water supply. In about 100 locations where the urban poor live, bore wells with pumping arrangements and storage tanks are being provided for supplying water for non-drinking purposes. 4. TRANSPORTATION OF WATER FROM DISTANT SOURCES BY ROAD: 4.1. TRANSPORTATION OF WATER FROM NEYVELI: Ground water drawn from Neyveli to tide over the present water scarcity. 462 water lorries hired making about 550 trips a day. The transportation of water commenced on 18.6.2001. Total quantity of 292.63 million litres of water transported till 21.8.2001. 4.2. TRANSPORTATION OF GROUND WATER FROM LOCATIONS AROUND THE CITY: Ground Water transported from locations around the city viz., Kannigaiper, Valliyur, Minjur, Poonamallee, Mamandur etc. by purchasing water from private agricultural wells. The transportation of water commenced on 28.6.2001. Total quantity of 398.03 million litres of water transported till 21.8.2001, 4.3. TRANSPORTATION OF WATER FROM K.P.CANAL (KARAGAMBAKKAM) Water released from the Kandaleru Reservoir in Andhra Pradesh on 2.7.2001 and reached Zero Point on 18.7.2001 at the rate of about 3 cusecs. To avoid evaporation and seepage losses water transported through tankers by road. To facilitate transportation by Road the PWD authorities built a bund at Karagambakkam at a distance of about 14.2 Kms. from Zero point. Filling points provided and pumping arrangements made to pump water to tankers. An underground sump of capacity 1.00 lakh litres constructed at Kannigaiper and water pumped to the 300 mld Plant at Redhills through the existing 600 mm water pipe line. These infrastructural facilities created at a cost of Rs. 9.00 Lakhs. The transportation of water from Karagambakkam (14th km) commenced on 18.7.2001 and 75.95 million litres were received till 21-08-2001.. 4.4.TRANSPORTATION OF WATER THROUGH TANKERS FROM CHENGALPATTU - KOLAVAI LAKE FOR INDUSTRIAL USE Raw water from Chengalpattu - Kolavai Lake transported for Industrial use. Filling points provided to draw water from the lake. Transportation of water commenced on 09.08.2001. Till 21-08-2001, 19.79 million litres of water transported to industries. 5.TRANSPORTATION OF WATER BY RAIL: 5.1. Water from the river Cauvery at Mettur: Water from the river Cauvery transported from Mettur by rail. Thetransportation of water commenced on 05.07.2001. A total quantity of 66.20 million litres of water transported till 21-08-2001. Water decanted at Villivakkam Railway Station and conveyed to the Kilpauk Water Treatment Plant through the existing conduits. The total expenditure incurred for making pumping arrangements at Mettur is Rs.65.20 lakhs. 5.2. Water from the River Cauvery at Erode Water from the Cauvery transported by rail from Erode. Transportation of water by rail commenced on 20.6.2001. Till 21.08.2001, 46 rakes received and the total quantity received - 66.65 million litres. 6. WATER DRAWN FROM THE AGRICULTURAL WELLS AT WELLFIELDS The following are the two main sources of water supply to Chennai city (1) surface water from sources like Poondi, Cholavaram, Redhills lakes and partly from Chembarambakkam lake and the water received from Andhra pradesh; and (2) ground water sources from six well fields namely Poondi, Tamaraipakkam, Flood Plains, Kannigaiper, Panjetty and Minjur. The ground water extracted from well fields is supplied to the industries at Manali area and partly to City. The yield from these wells started dwindling due to poor rain fall during the year 2000 and there was no recharge in the Aquifer. Hence to augment the city water supply and to tide over the water crisis, it was decided to hire 186 Nos. of private agricultural wells available in the well fields. The private Agricultural wells in Kilanoor, Magaral, Tamaraipakkam, Kannigaiper, Panjetty and Flood Plains which are located close to the pipeline system or Booster stations were identified and connected to the Metrowater Pipeline system. 110 mm PVC lines were laid to connect the wells with either the existing booster station or newly constructed sumps for transmission of water through the pipe lines. Water is pumped by utilising existing private pumps through these pipelines for about 18 hours a day to convey about 0.4 million litres. of water per well. The agriculturists are paid Rs.26/- per hour per well for pumping water. Out of the proposed 186 wells, 170 wells have already been connected with the existing Metrowater Transmission system. The total estimated cost of hiring these 186 agricultural well is Rs.843.26 lakhs including the cost of civil works, hiring charges and current consumption charges. Identification of further wells for hiring is also under progress for drawing additional water. As and when more wells are identified it would be connected to the system. 7 PRESENT WATER SUPPLY DISTRIBUTION IN THE CITY In view of the poor storage in the lakes, the water is mainly distributed through mobile water tankers to the public and the water supply through pipes have been considerably reduced. 7.1. Mobile Water Supply: Mobile water supply is maintained at about 7,700 trips per day for filling 9184 tanks and also by street supply for the benefit of 35 lakhs population at an average rate of 20 litres per capita per day and total quantity of 70 million litres daily is supplied through mobile water supply. 7.2. Additional Filling Points: Prior to this year, filling points were available only at 9 locations viz. (1) Anna Poonga, (2) Southern Head works (3) Kilpauk, (4) K.K.Nagar, (5) Thiruvanmiyur, (6) Pallipattu, (7) Muthimizl Nagar, (8) M.K.B.Nagar (9) Anna Nagar. With a view to cope with the increased fleet strength of tankers and increased demand for mobile water supply, new Filling Stations have been commissioned in 8 locations i.e. at Patel Nagar, Kolathur, Choolaimedu, Kannappar Thidal, Mylapore- Nandanam, Triplicane Velachery and Ekkattuthangal during this year. 7.3. Installation of additional stationery tanks: The Hon'ble Chief Minister instructed Metrowater to install 2000 Nos. of additional stationary tanks in defective streets to provide water to the public. So far 809 tanks have been installed additionally, making a total of 9184 tanks. Installation of further tanks are in progress. 7.4. Hiring of additional lorries: To streamline the mobile supply within the City, the existing fleet of tankers has been augmented by 152 Mini lorries and 149 tractors. Apart from this, there are 462 lorries carrying water from Neyveli and 396 Lorries carrying water for the city from locations like Mamandur, Palur, Poonamallee etc. 7.5. Erection of bore-wells with pumping arrangements and stationary tanks to supply water to Slums While every effort has been made to satisfy the water supply needs of Chennai, another scheme has been evolved to take care of the non-potable water needs of slum dwellers. This envisages construction of 100 deep borewells and connecting them to HDPE tanks for filling water by electrical motors.
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