POLAVARAM-VIJAYAWADA LINK PROJECT:
Tallamraju Surya Bhagawanulu, B.A.B.L (Andhra)
Senior Correspondent (retd.) United News of India (UNI)
16-3-4, Official Colony, Maharanipeta.P.O. Visakhaptnam-530002.
Land Line: 0891 2508152.
Tallamraju Surya Bhagawanulu, B.A.B.L (Andhra)
Senior Correspondent (retd.) United News of India (UNI)
16-3-4, Official Colony, Maharanipeta.P.O. Visakhaptnam-530002.
Land Line: 0891 2508152.
ABSTRACT
The link canal take-off from the proposed reservoir at Polavaram with full supply level of 40.23 mts and after transferring a distance of 174km(120 km in West Godavari and 54 km in Krishna district) the canal tails off into Budemeru upstream of Velegaleru regulator with F.S.L of 27.962m in Krishna district. The water to be transferred to Krishna river flows through a 12km long Budemeru diversion channel from Budemeru regulkator up to Prakasam Barrage. The link canal has been designed with a bed width of 68.5m and depth of 4.9m to carry discharge of 40,000cumsecs of water at the head of the project.
keywords: polavaram project, Budemeru, Jaggampeta, Krishna river,Hyderabad,drinking water
INTRODUCTION:
The 174km long Polavaram-Vijayawada link project has been proposed to carry surplus waters of river Godavari at Polavaram through right bank canal of Polavaram project to Prakasam Barrage on river Krishna in Krishna District. The canal envisages transfer of 5325 million cubic meters of water including 1402 Mm3 for irrigation purpose enroute the canal, in west Godavari and Krishna Districts. The link canal take-off from the proposed reservoir at Polavaram with full supply level of 40.23 mts and after transferring a distance of 174km(120 km in West Godavari and 54 km in Krishna district) the canal tails off into Budemeru upstream of Velegaleru regulator with F.S.L of 27.962m in Krishna district. The water to be transferred to Krishna river flows through a 12km long Budemeru diversion channel from Budemeru regulkator up to Prakasam Barrage. The link canal has been designed with a bed width of 68.5m and depth of 4.9m to carry discharge of 40,000cumsecs of water at the head of the project.The diversion of waters into the canal will be through a head regulator located in a saddle on the right side of the spillway of the Polavaram project. From the regulator the waters will first be let out into two subsidiary reservoirs formed by constructing two saddle dams and connected by open cuts. From the second subsidiary reservoir, the waters will flow through an approach channel and tunnels in to a stilling basin. The canal takes off from a head regulator to be located in the stilling basin.
The Godavari waters Disputes Tribunal (GWDT) stipulates among other provisions, transfer of 2265MCM(80TMC) of water from Godavari at Polavaram to Krishna at Prakasam Barrage. However, considering the development and irrigation potential of Andhra Pradesh region up to the year 2950AD and also with successful completion of the Mahanadi-Godavary link project(*see my other article published at this blogspot)its possible to divert the additional quantity of 1236 Mm3 through the proposed Polavaram-Vijayawada link canal to water deficit Krishna basin after considering the conveyance losses of 260 Mm3 ,the net quatum of water that reaches Krishna will be 350 Mm3.
TRANSFER OF WATER
Apart from affecting the inter basin transfer of water from Godavari to Krishna, the Polavaram-Vijayawada link canal brings under irrigation an additional area of 139740 ha in west Godavari and Krishna districts enroute by utilization of 1402 Mm3 of water at 150% irrigation intensity. The link canal runs parallel to Eluru canal but passes at a higher elevation. The cost of the project was estimated at 148805 lakhs at 1994-95 level including cost of command area development but excluding head works like dam etc.
The feasibility report of the project was thought to be completed by 1998. The benefit cost ratio of the project was worked out at 1:21. The net value of benefits from irrigation in the enroute area because of tghe project worked out to be at Rs.19925.57lakhs. The NWDA has proposed to undertake surveys for transferring the surplus waters of 20,000 Mm3 from Godavari from Inchampally in Karimnagar district to and Pulichintala projects.
Apart from affecting the inter basin transfer of water from Godavari to Krishna, the Polavaram-Vijayawada link canal brings under irrigation an additional area of 139740 ha in west Godavari and Krishna districts enroute by utilization of 1402 Mm3 of water at 150% irrigation intensity. The link canal runs parallel to Eluru canal but passes at a higher elevation. The cost of the project was estimated at 148805 lakhs at 1994-95 level including cost of command area development but excluding head works like dam etc.
The feasibility report of the project was thought to be completed by 1998. The benefit cost ratio of the project was worked out at 1:21. The net value of benefits from irrigation in the enroute area because of tghe project worked out to be at Rs.19925.57lakhs. The NWDA has proposed to undertake surveys for transferring the surplus waters of 20,000 Mm3 from Godavari from Inchampally in Karimnagar district to and Pulichintala projects.
TWO CANALS:
These two canals when completesd provide irrigation facilities to drought prone areas in districts of Karimnagar, Warangal, Khammam and Nalgonda.For taking up any of these inter-basin water transfer projects ,the following surveys and reports are essential.
1. Toposheet study involving planning of Head works and system.
2. 2. Reconnaince survey involving identification of proposed project sites, canal alignment etc.
3. Pre-feasibility report and collection opf field data.
4. Detailed field survey and othere investigations for identification of construction materials.
5. Final feasibility report and detailed project report.
These two canals when completesd provide irrigation facilities to drought prone areas in districts of Karimnagar, Warangal, Khammam and Nalgonda.For taking up any of these inter-basin water transfer projects ,the following surveys and reports are essential.
1. Toposheet study involving planning of Head works and system.
2. 2. Reconnaince survey involving identification of proposed project sites, canal alignment etc.
3. Pre-feasibility report and collection opf field data.
4. Detailed field survey and othere investigations for identification of construction materials.
5. Final feasibility report and detailed project report.
ACKNOWLEDGMENT:
I am indebted to the National Water Development Agency, Under Union Water Resources Ministry ,Governament of India.
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