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Nagarjuna Sagar tail pond is a multipurpose reservoir located 21 km downstream from the
Nagarjuna Sagar Dam Nagarjuna Sagar Dam is a masonry dam across the Krishna River at Nagarjuna Sagar which straddles the border between Nalgonda district in Telangana and Palnadu district in Andhra Pradesh. The dam provides irrigation water to the districts of Kr ...
across the
Krishna River The Krishna River in the Deccan Plateau, Deccan plateau is the third-longest in India, after the Ganga, Ganga and Godavari. It is also the fourth-largest in terms of water inflows and river basin area in India, after the Ganga, Indus and Godav ...
near Satrasala in
Nalgonda district Nalgonda district is a district in the Telangana state of India. Nalgonda district has the highest number of mandals in the state with 31 mandals. The district shares boundaries with Suryapet district, Suryapet, Rangareddy, Yadadri Bhuvanagiri, ...
, India. Its gross water storage capacity is 6
Tmcft Tmcft, (Tmc ft), (TMC), (tmc) is the abbreviation of thousand million cubic feet (1,000,000,000 = 109 = 1 billion), commonly used in India in reference to volume of water in a reservoir or river A river is a natural stream of fresh wa ...
. The reservoir water spread area extends up to the toe of the Nagarjuna Sagar dam. The project was completed by July 2014.


Hydro electricity generation

Two units of 25 MW each hydro power generation units were commissioned in the year 2017 by
APGENCO Andhra Pradesh Power Generation Corporation Limited is power generating organization in Andhra Pradesh. It undertakes operation and maintenance of the power plants and also setting up new power projects alongside upgrading the project's capacity ...
to utilize the head available across the dam from the river flood water and the water released to
Prakasam Barrage The Prakasam Barrage stretches 1223.5 m across the Krishna River connecting Vijayawada and Guntur district, Guntur districts in Andhra Pradesh, India. The Barrage (dam), barrage serves also as a road bridge and spans over a lake. The three canal ...
requirements.


Peaking power generation

Presently, the 700 MW reversible hydro turbines (7 x 100 MW) located at the toe of Nagarjuna Sagar Dam are unable to operate in pumping mode due to non availability of tail pond for storing the released water during the power generation mode. With the completion of tail pond, surplus electricity from the electricity grid would be used for pumping the water back to the Nagarjuna Sagar reservoir and recycled for meeting peaking load on daily basis. Thus surplus electricity is consumed when it is available and used to meet the peak electricity requirements without letting the water out of the Nagarjuna Sagar tail pond. 700 MW peaking power for eight hours duration can be met from the one Tmcft of live storage water capacity available in the tail pond.


Irrigation potential

200 Tmcft surplus water annually from the
Godavari River The Godavari (, Help:IPA/Sanskrit, �od̪aːʋəɾiː is India's second longest river after the Ganges River, Ganga River and drains the third largest Drainage basin, basin in India, covering about 10% of India's total geographical area. It ...
is planned to be fed into this tail pond by the Dummugudem Lift Irrigation Scheme which is under execution. The water transferred to this tail pond will be pumped to the upstream 410 Tmcft gross water storage capacity Nagarjuna Sagar reservoir to feed its right and left bank canals. Thus Nagarjuna Sagar reservoir need not receive the water supply from the upstream Srisailam reservoir. As the tail water level (48.33 m MSL) of this dam is below the full reservoir level (53.34 m MSL) of the downstream Pulichintala dam, surplus water in Pulichinthala reservoir can be pumped by envisaging
pumped storage Pumping may refer to: * The operation of a pump, for moving a liquid from one location to another **The use of a breast pump A breast pump is a mechanical device that Lactation, lactating women use to milking, extract milk from their breasts. They ...
units from Pulichinthala reservoir to Nagarjunasagar reservoir via this pond. The retained water in the Srisailam reservoir would be used for upstream water uses from Jurala and Srisailam reservoirs for irrigation needs in uplands of Telangana and Rayalaseema regions. The water from the Nagarjuna Sagar reservoir can also be pumped to the Srisailam reservoir by Srisailam left bank hydro electric power station (900 MW) in pumping mode in case of severe drought in Krishna river basin. Koilsagar lift irrigation project (near ), Rajiv Bheema lift irrigation project, Nettampadu lift irrigation project (near ), Kalwakurthy lift irrigation scheme, Srisailam Left Bank Canal, Telugu Ganga irrigation project, Handri Neeva lift irrigation project, Galeru Nagari irrigation project, Veligonda irrigation project etc. which are in advanced stage of construction, are depending on the Krishna river water available at Jurala / Srisailam dams. A lift canal from the Krishna river ( at 20 m MSL) downstream of Pulichintala dam will be executed to feed
Godavari The Godavari (, �od̪aːʋəɾiː is India's second longest river after the Ganga River and drains the third largest basin in India, covering about 10% of India's total geographical area. Its source is in Trimbakeshwar, Nashik, Maharash ...
water diverted from
Polavaram Polavaram may refer to: * Polavaram, Eluru district, a village in Andhra Pradesh * Polavaram, Krishna district, a village in Andhra Pradesh * I. Polavaram, East Godavari district, a village in Andhra Pradesh *I. Polavaram mandal The I. Polavara ...
to some of the existing command area (situated below 60 m MSL) under Nagarjuna Sagar right bank canal to facilitate extension of Nagarjuna Sagar right bank canal connecting to Kandaleru feeder canal / Somasila reservoir.


Alternate to Dummugudem to Nagarjuna Sagar tail pond link canal

Dummugudem to Nagarjuna Sagar tail pond link canal is entirely located in
Telangana Telangana is a States and union territories of India, state in India situated in the Southern India, south-central part of the Indian subcontinent on the high Deccan Plateau. It is the List of states and union territories of India by area, ele ...
region and needs to be routed through high lands which necessitate more pumping head. An alternative link canal to Nagarjuna Sagar tail pond from Polavaram dam is also economically feasible to transfer Godavari water. This link canal passes entirely through the coastal Andhra Pradesh region only.


Joint projects with Karnataka

The Rajolibanda barrage is not receiving adequate continuous flows due to excessive water utilization in its catchment area in Karnataka. The lower Tungabhadra basin badly needs water augmentation from the adjacent Krishna river. This is achieved with a 20 km long tunnel from Narayanpur reservoir to the Maski nala reservoir / tank situated at 475 m MSL for drawing nearly 250 tmcft Krishna river water. It would also provide additional water to bring more area under irrigation in uplands of Raichur & Mahboobnagar districts. Reliable Krishna river water can be supplied instead of unreliable Tungabhadra river water to the existing Tungabhadra Left bank canal in Raichur district, existing Tungabhadra right bank low level canal, the existing Rajolibanda left bank canal and the existing 150 years old
K. C. Canal Kurnool Cuddappah Canal popularly known as K.C. Canal is an irrigation canal located in Kurnool and Kadapa district, Kadapa districts in Andhra Pradesh, India. History The K.C.Canal was constructed between 1863 and 1870 as an irrigation and navi ...
. Thus substantial Tungabhadra reservoir water would be saved for utilization in upstream new projects and reliable Krishna river water supply is ensured to existing projects. A new barrage (FRL 349 m MSL) across the Krishna river just downstream of Bhima river confluence point on the common border of Karnataka and Andhra Pradesh states (near ), can also be taken up to supply Krishna river water by lift irrigation to the westernmost parts of
Mahbubnagar district Mahabubnagar district, also known as Palamuru district, is a district in the Indian state of Telangana. Mahbubnagar, Mahabubnagar is the district headquarters which is popularly known as Palamoor. The district shares boundaries with Narayanapet ...
and high lands lying east of Bhima river in Karnataka. Ultimately, 500 tmcft water is to be transferred annually from the Godavari river to this pond for meeting various water needs in Andhra Pradesh. Thus Nagarjuna Sagar tail pond will play pivotal role to put to use the water from the Godavari River in all regions of the
Andhra Pradesh Andhra Pradesh (ISO 15919, ISO: , , AP) is a States and union territories of India, state on the East Coast of India, east coast of southern India. It is the List of states and union territories of India by area, seventh-largest state and th ...
state.


See also

* * Icchampally Project * Dummugudem Lift Irrigation Scheme


References

{{Krishna River dams Dams in Andhra Pradesh Lift irrigation schemes Irrigation in Andhra Pradesh Krishna River Buildings and structures in Krishna district Pumped-storage hydroelectric power stations in India 2014 establishments in Andhra Pradesh Infrastructure completed in 2014