Site Survey: Hydrological & geological Survey. Site Survey: Hydrological & geological Survey


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Site Survey: Hydrological & geological Survey.

  • Site Survey: Hydrological & geological Survey.

  • Estimation of Potential

  • Regulations & Environmental Concerns

  • Feasible Supply

  • Turbine Selection

  • Costing and Payback.



To measure the flow-rate vs time at a given site.

  • To measure the flow-rate vs time at a given site.

  • Direct Measurement of the flow rate.

  • The more robust option is to find out the flow-rate by working out the volume of water that was entering the river.

  • This uses the rainfall data from met office.























Mean potential power

  • Mean potential power

  • The annual mean discharge is the value that equalizes the area of the annual flow duration curve.

  • The average of mean flow is understood as the arithmetic mean of annual mean discharges for a period of 10 to 30 years.

  • Minimum potential power, or theoretical capacity of 100%, is the term for the potential computed from the minimum flow observed. Np100

  • Small potential power. The theoretical capacity of 95% can be derived from the discharge of 95% duration as indicated by the average flow duration curve. Np95.

  • Median or average potential power. The theoretical capacity of 50% can be computed from the discharge of 50% duration as represented by the average flow duration curve. Np50.







A reservoir is a manmade lake or structure used to store water.

  • A reservoir is a manmade lake or structure used to store water.

  • A reservoir with dam has an uncontrolled inflow but a largely controlled outflow.

  • The water available for storage is totally a function of the natural stream flow.

  • Reservoir capacity is the max. volume of water that can be stored in the particular reservoir.

  • It is the normal maximum pool level behind a dam.

  • This can be calculated by using a topographic map of the region.























The Kali River or Kalinadi is a river flowing through Karwar, Uttara Kannada district Karnataka state in India.

  • The Kali River or Kalinadi is a river flowing through Karwar, Uttara Kannada district Karnataka state in India.

  • The river takes its birth at diggi in Western Ghats, a small village in Uttar Kannada district.

  • The river is the lifeline to some 4 lakh people in the Uttara Kannada district.

  • Supports livelihoods of tens of thousands of people including fishermen on the coast of Karwar.

  • There are many dams built across this river for the generation of electricity.

  • One of the important Dams build across Kali river is the Supa Dam in Ganeshgudi.

  • The river extends to 184 kilometers before joining Arabian Sea.







Concrete Dam

  • Concrete Dam

  • Dimensions: 101 Mtrs high and 332 Mtrs long concrete gravity dam is built across the Kalinadi river in Joida Taluk of Uttara Kannada District.

  • Catchment area of 1057 Sq.Kms

  • Gross Storage Capacity : 4178 M cum.

  • Live Storage Capacity: 4115.2 M cum.

  • Design Head: 72 m

  • Design Discharge: 154 cumecs.

  • Type turbine : Vertical Francis : 2 ×50MW

  • Rated Speed : 200 rpm





Takes water from Bommanahalli Pick up Dam :Concrete/masonry/earthen.

  • Takes water from Bommanahalli Pick up Dam :Concrete/masonry/earthen.

  • Gross Storage Capacity : 97.25M cum.

  • Live Storage Capacity: 83.9 M cum.

  • Design Head: 347 m

  • Design Discharge: 275.5 cumecs.

  • Type turbine : Vertical Francis : 3 ×135 + 3 ×150 MW

  • Rated Speed : 375 rpm





Kodasalli Dam :Concrete/earthen.

  • Kodasalli Dam :Concrete/earthen.

    • Gross Storage Capacity : 286.49 cum.
    • Live Storage Capacity: 198.82 cum.
    • Design Head: 37 m
    • Design Discharge: 369 cumecs.
    • Type turbine : Vertical Kaplan : 3 ×40 MW
    • Rated Speed : 166.67 rpm
  • Kadra Dam :Concrete/earthen.

    • Gross Storage Capacity : 388.92 cum.
    • Live Storage Capacity: 209.06 cum.
    • Design Head: 32 m
    • Design Discharge: 526.5 cumecs.
    • Type turbine : Vertical Kaplan: 3×50 MW
    • Rated Speed : 142.86 rpm






The river Sharavathi originates at a height of 730m near Ambuthirtha, in Shimoga district.

  • The river Sharavathi originates at a height of 730m near Ambuthirtha, in Shimoga district.

  • It flows in a north-west direction, in its long, 132-km journey.

  • The Sharavathi is joined by several tributaries.

  • It traverses through hilly terrain and dense forests.

  • After a stretch of 80 km along its course, the river drops down a steep mountain face of 293m – a visually delightful spectacle known as the Jog Falls..

  • From this breathtaking leap, the river continues its journey till it flows into the Arabian Sea near Honnavar.

  • The total catchment area of the river up to its confluence with the Arabian Sea is 2,774 sqkm.

  • The basin receives a rainfall ranging between 5000-7500 mm.

  • About 95% of the rainfall is received during the month of June to September









The name of the reservoir and dam is Linganamakki.

  • The name of the reservoir and dam is Linganamakki.

  • This is located 9.63 km upstream of Jog Falls.

  • The catchment area for the dam is 1991.71km2

  • Maximum (Average) discharge possible for Power Generation : 315 – 473 Cumecs.

  • Techno-economically feasible discharge : 285 cumecs.

  • The top of the dam is 1819 feet (554m) above sea level.

  • The area of the dam is 300km2

  • The storage capacity of the Reservoir is : 4,419.26 million cubic meters.

  • Submerging 50.62 km² of wetland and 7 km² of dry land, the remaining being forest land and wasteland.[



Capacity:1035 MW.

  • Capacity:1035 MW.

  • Head avaialabe: 443 m

  • Specific Speed: 0.1231N







Dated February 7, 1958: Sharavathi project

  • Dated February 7, 1958: Sharavathi project

  • Mr. S.K. Patil, Union Minister for Power and Irrigation, inaugurated on February 5 the Rs. 40-crore Sharavathi Hydro-Electric Project at Linganmakki, five miles from Gerosappa Falls.

  • Mysore has been the pioneer in generating electricity, her first attempt at power generating dating to 1902. The Sharavathi project is the biggest step taken in the development of power in the State.

  • The Union Minister paid a tribute to the skill and efficiency of Mysore engineers.

  • The Chief Minister of Mysore Mr. S. Nijalingappa, who presided, said, “The hydro-electric potential of the river systems in the State is vast and it is estimated that it would be possible to generate as much as three million kW by harnessing the several rivers and streams."



Generation during the year was 26020 MU as against 25080 MU during the previous year.

  • Generation during the year was 26020 MU as against 25080 MU during the previous year.

  • Turnover during the year was Rs.4397 crores as against Rs.4148 crores during the previous year, increase in energy sales in thermal and DG Plant.

  • Profit before tax during the year was at Rs.711 crores as against Rs.392 crores during the previous year.




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