Mettur Municipality
Mettur Municipality
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Existing Situation

Water supply situation in Mettur is satisfactory.
The responsibility of designing and executing capital works in water supply rests with the Tamilnadu Water Supply and Drainage Board (TWAD). The agency after developing transfers the projects to the local body, who will maintain the system. Hence any decisions on water supply and drainage improvements will largely depend upon the TWAD’s consent and cooperation.



Water Supplied

7.50 MLD


Cauvery River

Distribution Length

62.900 Km

Storage Reservoirs

3 Nos.

Storage Capacity

2.85 MLD

Per Capita Supply

139 LPCD



Public Stand Posts


II (5) River and Dam Details :

Source                                                                          :           River Cauvery

The Cauvery river, the largest in southern India, rises in Mercara in Coorg District at 4400 ft. MSL and plains a considerable area of eastern slopes of western ghats. This area is subject to heavy rainfall during south-west monsoon which extends from June to September and it is during this months that the Cauvery discharges by far the greater part of annual supply. The highest floods usually occur during July and August though on rare occasions they have been as late as November.

Early in its course, the Cauvery enters the Karnataka state where it is joined by the tributaries Hemavathy and Lakshmana Thirtham which drain the areas lying to the north and south respectively.

Some twelve miles to the north-west of Mysore city, the river is now intercepted by Krishnaraja Sagar dam of the Karnataka Government. it impounds water not only for the improvement of irrigation, but also it ensures a regular and sufficient supply throughout the year to the important Hydro-electric generating station at Sivasamudram situated lower down the river on the Tamil Nadu-Karnataka border. Before reaching Sivasamudram, it is joned from the south by another important tributary, the Kabini river. Hogenakkal falls from the northern limit of the Mettur Reservoir. The river runs in a gorge for some 15 miles below the falls before reaching the more open country. Three minor tributaries, the Palar on the west and the Chinnar and the Thoppiar on the east enter the reservoir above Mettur where the dam has been constructed.

From this point downwards the catchment is subject to the North-East Monsoon and the high floods due to this monsoon usually occur in November. The Bhavani, Amaravathi and Noyyal are chief tributaries joining the river in this reach though the first two on their upper reaches are under the influence of the South-West Monsoon rains as well. This sequence of rainfall conduces to a fairly flow during the irrigation season from June to January expect expect for a short period of about six weeks when there is a break in the monsoon. When South-west supply is copious and dependable the North-east Monsoon frequently affected the cultivation of the Cauvery Delta. The Chief aim of the Cauvery Mettur System is to remedy the system of affairs by storing the water of the surplus floods in the South-west Monsoon and distributing them evenly through the succeeding the irrigation period.

Before the River Cauvery reaches Trichy District, it becomes wide with a sandy bed and flows in an eastern direction. At the upper anicut the river divides into two branches the northern branch being called Colernoon, while the southern branch retains the name Cauvery.

Some ten miles below Trichy the two rivers again join to form the Srirangam island. At their junction the Grand anicut forms the head of the great irrigation system in the Thanjavur district. Here, the Cauvery becomes one of the three regulated streams and ultimately discharge into Bay of Bengal some 8 miles north of Tharangambadi as an insignificant stream, the whole of its water having been utilised for irrigation.

The final and carefully designed Cauvery Mettur Project was submitted by Col.W.M. Ellis in 1910 and the execution of the scheme was started on 20.07.1925, when the first blast was made. The project as designed, provides for a sixty square miles lake impounding 93,500 mcft. of water. The dam is 5,300 ft. long and the reservoir backs up 33 miles to the foot of 70ft. high Hogenekkal falls which become partly submergible.

A new canal, the Grand anicut canal, with a capacity of 4,200 cusecs, was also excavated to supply an extent of 2,71,000 acres of new irrigation. The total cultivation in the delta 10,82,000 acres of single crop and 2,70,000 acres of double crop. The reservoir is expected to supply the requirements of this area of 13,52,000 acres.

The design of the dam provides for its height being raised by 10 ft. at later date to compensate for the silting up of the reservoir bed by providing for extra capacity of 17,500 M.cft.


Latitude : 11o 48’ 58”
Longitude : 77o 48’ 38”
Year of starting of Construction : 20.07.1925
Year of completion of Construction : 21.08.1934
Catchment area : 16300 Sq. Miles
Total Length of Dam : 5300 Feet
Width of River at Dam site : 1100 Feet
Greatest height of Dam : 214 Feet
Greatest width of Dam at Dam site : 171 Feet
Width of Dam at top : 20’ 5”
Width of Roadway : 16’ 0”
Maximum Depth of storage : 165’
Maximum flood discharge in (1924)
Duration (12 hours) : 4,56,000 Cusecs

Maximum water spread area : 59.25 Sq.Miles

Total Length of Gallery : 4400 Feet
Maximum length of river at F.R.L. : 33 Miles
Gross capacity at F.R.L. : 95660 MCFT.
Effective Capacity at F.R.L. : 93470 MCFT.
Minimum dry weather flow : 1000 CFT per sec.
Capacity of Supply channel : 25000 CFT per sec.


Area of new irrigation in Tanjore District : 301000 Acres
Total length of Main canals : 106 miles
Total length of Branches : 694 miles
Total length of minor Distributaries : 1904 miles


Mettur power station which is located at the foot of the Mettur Dam was completed in 1937. It has four hydro-generators with 1000 KW capacity each. Each generator is run by two turbines 8000 HP capacity. The power generated from this power houses is transmitted through 110 KV lines to Erode on one side and Singarapet on the other. The other power house Mettur Tunnel power house was planned to utilise the irrigation discharge of 20000 cusecs in full for power generation. This power plant of 200 M.W. Capacity is the biggest hydro station so far constructed in Tamil Nadu.

Water Supply and Drainage Details :


Scheme – I
            60 H.P. Motor with centrifugal pumps                    :           2 Nos. (1 No. for Standby operation)
Scheme – II
            125 H.P. Vertical Turbine motor pump set             :           2 Nos. (1 No. for standby operation)


Clari-flocculator                                                         Coagulation Tank                                                     
Rapid Sand Filters                                             
25 H.P. Air wash motor                          
Low Level Service Reservoir                                              (Two compartments) (For Ward Nos. 10 – 30)

1 No.
2 Nos.
4 Nos  
1 No.
1 No.   (18 Lakhs Litres capacity)



            50 H.P. Motor with Centrifugal pumps                   :           2 Nos. (1 No. for standby operation)
            Low Level Service Reservoir                                 :           1 No. (9 Lakhs Litres capacity)
            (Two compartments) (For Ward Nos. 1 – 9)


            30 HP motor with centrifugal pumps                     :           2 Nos. (1 No. for standby operation)


            10 HP motor with centrifugal pumps                     :           2 Nos. (1 No. for standby operation)