శరవేగంగా సాగుతున్న పోలవరం ప్రాజెక్టు పనులు
Polavaram status as compared to the five year period from June 2015 to June 2019 (Then) and the 19 months thereafter (Now)
*1)Spill way*:Total spillway blocks 53. Length 1118.4 metres. Foundation level -18.5 to + 10 mtrs. Spill way crest level + 25.72 mtrs. The previous government has completed +34 mtrs level spill way concreting up to June 2019 whereas
Now; the length of spillway being 55 mtrs of which nearly +54 mtrs works are completed as of now.
2) Radial gates Spillway crust level is + 25.72 meters. The total number of gates is 48. The width of the gate is 16 meters and the height is 20 meters. By closing these 48 gates, the reservoir can store 194.60 billion cubic feet of water up to the full level +45.72 meters. To fasten these gates, the spillway pillars must be completed up to a height of +54.00 m. But the spillway pillars were not completed to a height of 54 m (at a height of +34 m) and the iron foil was temporarily fastened like a gate. It was advertised as radial gates installation completed then.
Now; 9 radial gates have already been installed for a total of 48 radial gates. Work on the remaining gates is expected to be completed by April, 2020
3) Spillway Bridge Concrete girders
Each spillway bridge is supported on 4 vertical girders. A total of 48 slabs have 192 vertical girders. The length of each girder is about 21 meters. Out of a total of 192 girders, only 22 girders have been completed in 5 years then.
Now; a total of 170 girders were completed during these 18 months.
4) Spillway Bridge Slabs The Spillway Bridge Slab can be used to lift and lower gates from one side of the spillway to the other and for continuous inspection and monitoring of the gates by officers and staff. Slabs should be constructed on the top of 48 columns. Each slab is approximately 21.5 mtrs long and 9.75 mtrs wide. The thickness is 0.45 mtrs.
Not a single slab of work on these 48 slabs has been started in the last five years then.
Now; construction of 40 slabs completed for a total of 48 slabs. Work is in full swing to complete all the slabs by February 15, 2021.
5) Trianon girders
To install, operate and maintain the 48 gates on the spillway, 49 trianon girders are to be installed on the slope below the 49 pillars water flow. The arm girders of the radial gates are connected to these to operate the gates. The total weight of the gate, which weighs 300 tons, is based on these trianon girders. Trianon girders must be completed to install the dam gates but they are not complete. To tighten the hydraulic cylinders the fulcrums should be fitted at a height of +45.00 m. But it’s not tightened. The level of the pillars should be at least 54.00 meters. None of this has been completed in the past five years, so the work of the Trianon girders has not started then.
Now; 40 girders were completed for a total of 49 trianon girders. All other trianon girders will be completed by the end of January, 2021.
6) Excavation works for foundations of Power House The Polavaram Power Station is designed to generate a total of 960 MW of electricity with 12 units each with a capacity of 80 MW. It is needed to excavate from +135 m to +12 m for the powerhouse. Excavation work from +135 m to +110 m was completed before 2014.
The previous government excavated only 18 meters from +110 meters to +92 meters i.e. excavation work is still to be done at a height of 80 m i.e. from +92 m to +12 m. The Average height of 30 m is completed partially and still 90 meters is to be done.
Now; excavation started at +92 meters and average of 6000 cubic meters per day work is being done. The front of 1 to 6 units is almost complete for a total of 12 units. All excavation work will be completed by March
7) Rehabilitation and Resettlement (R&R) The construction of the Polavaram project has inundated 371 settlements of 222 villages in the East and West Godavari districts. Of these, a total of 1,05,601 displaced families are to be rehabilitated . In the last five years only 1846 houses have been completed in 15 rehabilitation centers. There is also a severe shortage of infrastructure in these rehabilitation centers then.
Now; Construction of 11,500 houses in 47 R&R colonies is almost complete in the last 19 months. The government is taking steps to rehabilitate 17,860 displaced families by May, 2021.
*8) Spill Channel*:Due to the unplanned construction of the Coffer dam, the entire spill channel was filled with flood water and mud due to the floods of 2019. The conditions were such that water and mud had to be removed to do the rest of the work. The spill channel is 2,920 meters long and 1,000 meters wide. This requires the completion of earthworks and the construction of 10 m long and 10 m wide concrete blocks with a thickness of 1 m. Not only works were started, but the major designs were not even approved. The soil on the left and right embankment slopes of the spill channel is
28 сен 2024