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2008 hydroplogy project-feasibility-of_sapan_project

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2008 hydroplogy project-feasibility-of_sapan_project

  1. 1. 1 Presented by- PPT Downloaded from http://www.pravinkolhe.com/
  2. 2.  Hydrological Study Done by IPI Division, Buldhana  CWC Remarks  Hydrological Study Done by CDO Nashik.  Yield Studies  Simulation Studies  Project Demands  Simulation Study  Other input Data for simulation study  Concluding Remarks.  Acknowledgement 2 PPT Downloaded from http://www.pravinkolhe.com/
  3. 3.  To Study 50% dependable yield at Sapan River Project  To study feasibility of project from hydrology point of view, by increasing height of dam.  To understand the methodology behind feasibility study. 3 PPT Downloaded from http://www.pravinkolhe.com/
  4. 4. 4 PPT Downloaded from http://www.pravinkolhe.com/
  5. 5.  Sapan River Project is under construction project  Location:  Tal: Achalpur  Dist: Amravati 5 PPT Downloaded from http://www.pravinkolhe.com/
  6. 6. Yield Study (Nov-1995) 6 Yield Study (Nov-1995) Simulation Study (Nov-1995) PPT Downloaded from http://www.pravinkolhe.com/
  7. 7.  Worked out using R-R regression equation developed at Shahanpur project.  Shahanpur project is situated in adjacent valley  Details of regression analysis are not given  Rain Gauge Stations-  Chikhaldara (Area=67 sq. km)  Deogaon (Area=48 sq. km)  Weighted Factors-  Chikhaldara = 67/115=0.58  Deogaon = 48/115=0.42  Both R-G stations were outside catchment. 7 PPT Downloaded from http://www.pravinkolhe.com/
  8. 8.  Rainfall Data considered-  Chikhaldara (1914 to 1988)  Deogaon (1914 to 1988)  Rainfall Data Available-  Chikhaldara (1914 to 1988)  Deogaon (1976 to 1987) 8 PPT Downloaded from http://www.pravinkolhe.com/  Rainfall data of Deogaon for period 1914 to 1975 and 1988 was GENERATED using R-R correlation of Chikhaldara and Deogaon.
  9. 9.  Working Table has been prepared only for 75% dependable year.  NOT FOR 50% DEPENDABLE YEAR. 9 PPT Downloaded from http://www.pravinkolhe.com/
  10. 10. Yield Study (Dec-2003) 10 PPT Downloaded from http://www.pravinkolhe.com/ Yield Study (Dec-2003) Simulation Study (Dec-2003)
  11. 11.  The hydrology study needs revision because 75% dependable R-R calculated SEPERATELY for R-G stations-  Chikhaldara  Deogaon  A single weighted average rainfall series considering the rainfall at both R-G stations & taking appropriate weightages should be prepared.  Then estimate 75% dependable basin R-R yield by using appropriate R-R relationship/empirical formula 11 PPT Downloaded from http://www.pravinkolhe.com/
  12. 12.  The annual lake evaporation loss considered in reservoir operation was 1.12 MCM as against earlier figure of 1.2147 MCM.  For medium projects, Evaporation loss=10 to 20 % of annual utilization  Evaporation loss value must be RECHECKED and CONFIRMED. 12 PPT Downloaded from http://www.pravinkolhe.com/
  13. 13.  Simulation Study done for ONLY ONE year.  It should be for 20-30 year’s with derived success rate of-  Domestic Use = 100 %  Industrial Use = 90 %  Irrigation Use = 75 % 13  Correct efficiencies must be used.  The deficiencies in the estimation of Crop Water Requirements should be rectified. PPT Downloaded from http://www.pravinkolhe.com/
  14. 14. 14 PPT Downloaded from http://www.pravinkolhe.com/
  15. 15. Yield Study (Oct-2004) 15 PPT Downloaded from http://www.pravinkolhe.com/ Yield Study (Oct-2004) Simulation Study (Oct- 2004)
  16. 16. 1) Availability of Rainfall Data 2) Weighted Average Rainfall 3) Monthly Rainfall Runoff Correlation 4) Computation of Yield Series a) Post Monsoon Flow b) Regeneration Flow 16 PPT Downloaded from http://www.pravinkolhe.com/
  17. 17.  IPI Buldhana had worked out yield considering two rain gauge stations. Present study is done considering three rain gauge stations. Third Station is, 17 PPT Downloaded from http://www.pravinkolhe.com/ Raingauge Station Influencing Area (%) Data for Year Ghatang 65.3 1976-2003 (28 years)
  18. 18. 18 PPT Downloaded from http://www.pravinkolhe.com/
  19. 19. The weighted average monthly rainfall for monsoon month i.e. June to October has been Computed by Theissens Polygon method , 19 PPT Downloaded from http://www.pravinkolhe.com/ Sr.No . Name of Station Theissen Weight 1 Chikhaldara 0.151 2 Deogaon 0.196 3 Ghatang 0.653
  20. 20.  IPI Buldhana had worked out the yield series using monsoon rainfall- runoff correlation.  For this study, Dedtalai CWC river gauging site in Tapi basin is considered.  Catchment of Dedtalai river gauging site and Sapan project lie in the same hydrometrological Zone 20 PPT Downloaded from http://www.pravinkolhe.com/
  21. 21. 21 PPT Downloaded from http://www.pravinkolhe.com/
  22. 22.  Normal Rainfall @ Dedtalai is- 980mm @ Sapan is - 1105m The rainfall runoff Correlations are 22 1 June Y6=0.109525*X6 – 0.71068 R=0.91 2 July Y7=0.57386*X7 – 8.80533 R=0.93 3 August Y8=0.642047*X8 – 6.63661 R=0.85 4 Septemb er Y9=0.49847*X9 – 0.59306 R=0.80 5 October Y10=0.1375*X9 – 0.2585*X10 -0.686 R=0.85 PPT Downloaded from http://www.pravinkolhe.com/
  23. 23. 23 PPT Downloaded from http://www.pravinkolhe.com/
  24. 24. 24 PPT Downloaded from http://www.pravinkolhe.com/ Post Monsoon Flow Regeneration Flow
  25. 25. 25 PPT Downloaded from http://www.pravinkolhe.com/  The monthly breakup of post monsoon flow of Sapan is done proportionately on the basis of available distribution. Month Nov Dec Jan Feb Mar April May Total PM flow Postmonsoo n flow dist. % 1.24 0.6 0.26 0.15 0.09 0.08 0.09 2.5
  26. 26. 26 PPT Downloaded from http://www.pravinkolhe.com/  It is not possible to measure regeneration flow. Regeneration flow is added at the rate of 10% of upstream utilization. Month Nov Dec Jan Feb Mar April May Regene. Flow % 25 20 15 15 10 10 5
  27. 27. 27 PPT Downloaded from http://www.pravinkolhe.com/  Considering post monsoon flow as 2.5%vof monsoon flow & regeneration flow as 10% of upstream utilisation , & upstream utilisation as2.5 MCM , the net monthly yield series at Sapan dam site is worked out for the period 1976 to 2003 ( 28years) Dependability Annual virgin Yield Annual Net Yield 75% 32.99 MCM 30.77 MCM 50% 51.76 MCM 49.51 MCM
  28. 28. 28 PPT Downloaded from http://www.pravinkolhe.com/
  29. 29.  Simulation study is carried out to check the performance of the project  CWC recommends minimum 40 years series if carry over provided otherwise 25 years series is sufficient  For sapan project 28 years series is considered due to constraint in avaibality of rainfall data  As per IS5477-part I 1969 live storage of the project should be sufficint to satisfy 100% demand of drinking water 90% for power and 75% for irrigation of its life period 29 PPT Downloaded from http://www.pravinkolhe.com/
  30. 30.  Monthly net runoff series for minimum period (40/25) depending on carry over.  Original area capacity curve for 25 years and modified area capacity curve for 50 years  Monthly evaporation depths  Monthly net yield series 30  Monthly demands for  Domestic water supply  Industrial water supply  Irrigation  Hydro power generation  Controlling levels of sapan river project  FRL  MDDL PPT Downloaded from http://www.pravinkolhe.com/
  31. 31. Evaporation data  CWC suggested pan evaporation values for Amravatidata reduced by 70% for working out lake losses.but this data is not obtained  A paper named “Pan evaporation over india” written by Rathod and B.C. Biswas used for calculation of monthly evaporation over water spread area 31 PPT Downloaded from http://www.pravinkolhe.com/
  32. 32. 32 PPT Downloaded from http://www.pravinkolhe.com/
  33. 33.  Original area capacity table prepared on the basis of contour survey. Silt Load & Sedimentation Studies :  Silt Rate of 0.75 Acre feet/ Sq. Mile/ Yr. recommended by CWC for Ghat Catchment is considered.  As per CWC’s recommended practise, this being a medium project silt pocket is provided for 50 years & 25 years silt load is considered for working out encroachment in the live storage capacity for simulation study. 33 PPT Downloaded from http://www.pravinkolhe.com/
  34. 34. 34  Catchment Area = 115.00 Sq. Km.  Silt Rate Considered  Acre Feet/Sq. Mile/Year = 0.75  Cum/Sq.Km/ Year = 357.190  Trap Efficiency = 0.97  Silt Load from Untrapped Area = 357.190 X 115 X 0.97 X 50 10^6 = 1.99 MCM Say = 2.00 MCM PPT Downloaded from http://www.pravinkolhe.com/
  35. 35. 35  Catchment Area = 115.00 Sq. Km.  Silt Rate Considered  Acre Feet/Sq. Mile/Year = 0.75  Cum/Sq.Km/ Year = 357.190  Trap Efficiency = 0.97  Silt Load from Untrapped Area = 357.190 X 115 X 0.97 X 25 10^6 = 0.995 MCM Say = 1.00 MCM PPT Downloaded from http://www.pravinkolhe.com/
  36. 36. 36 In order to Estimate the lake evaporation losses while carrying out Simulation study, water spread areas at intermediate levels are required. This possible by Developing relationship between Modified area & Modified capacity, Using it in Computer Simulation Model. The Polynomial is as under Y = Ao + A1 X + A2 X^2 + A3 X^3 + A4 X^4 +… Where, Y = Water spread area in M.Sq.m at particular R.L X = Capacity in MCM at that R.L Ao , A1, A2 , A3, A4….. Are constants. PPT Downloaded from http://www.pravinkolhe.com/
  37. 37. 37 PPT Downloaded from http://www.pravinkolhe.com/
  38. 38. 38 PPT Downloaded from http://www.pravinkolhe.com/ Crop Water Requirement Overall Efficiency Drinking Water Supply
  39. 39. 39 Two seasonal Percentage Cotton 30 Chilies 10 Kharip Jawar 15 Paddy 5 Pulses (un-irrigated) 15 Oil seeds (Groundnuts) 25PPT Downloaded from http://www.pravinkolhe.com/
  40. 40. 40 Follow on crops Wheat 10 Gram 20 Oil seeds sunflower 20 Vegetables cabbages 10 PPT Downloaded from http://www.pravinkolhe.com/
  41. 41. 41 Month Water for 1000 Ha in MCM Water for 4400 Ha in MCM Water for 3750 Ha in MCM Water for 5500 Ha in MCM June 0.051 0.223 0.190 0.279 July 0.100 0.440 0.375 0.550 august 0.118 0.519 0.443 0.649 September 1.083 4.764 4.060 5.955 October 1.661 7.309 6.230 9.137 November 1.961 8.628 7.354 10.786 December 3.740 16.455 14.024 20.568 January 0.193 0.849 0.723 1.061 February 0.000 0.000 0.000 0.000 March 0.000 0.000 0.000 0.000 April 0.000 0.000 0.000 0.000 May 0.000 0.000 0.000 0.000 Total 8.906 39.187 33.398 48.984PPT Downloaded from http://www.pravinkolhe.com/
  42. 42.  CWC in its remarks has stated that, The field application efficiency is considered as 45 % and conveyance efficiency is 100%. These efficiencies are generally considered at 65-70% for medium project having unlined canal.  In the present study the overall efficiency is considered as 49 % by field officers. 42 PPT Downloaded from http://www.pravinkolhe.com/
  43. 43.  Annual drinking water and industrial water supply requirement of 0.6 MCM has been proposed in the project report.  The same is distributed equally in 12 months and is considered in present study. 43 PPT Downloaded from http://www.pravinkolhe.com/
  44. 44. 44 PPT Downloaded from http://www.pravinkolhe.com/
  45. 45. Simulation studies has been carried out by simple water balance equation I = ds +W+S+E-C*R Where,  I = Inflow in MCM  ds= change in storage in tank in MCM  W= Total withdrawals in MCM 45  S = spill in MCM  E = Evaporation loss in MCM  C = A factor specifying the increase in the runoff volume over lake area compared to virgin condition.  R = Rainfall over water spread area PPT Downloaded from http://www.pravinkolhe.com/
  46. 46. The above equation is further simplified to Es=IS+I+CR-S-E-W Where,  ES=End storage in MCM  IS= Initial storage in MCM  As ds=Es-Is 46 The rainfall effect over the reservoir being negligible has not been considered and therefore C is considered as zero PPT Downloaded from http://www.pravinkolhe.com/
  47. 47. In order to get 100% success of domestic water supply a rule curve is essential. In this case monthly domestic water supply is very meager, assuming that drinking water supply will be directly lifted from Sapan reservoir, MDDL throughout the year is considered as rule curve. 47 PPT Downloaded from http://www.pravinkolhe.com/
  48. 48. 48 PPT Downloaded from http://www.pravinkolhe.com/
  49. 49. 49 PPT Downloaded from http://www.pravinkolhe.com/  Recommendations of IS:5477-Part I – 1969  Basic input data  Runoff  Area capacity curve  Water losses  Controlling levels of dam  Silt load & sedimentation studies Project Demands  Crop water requirements  Overall efficiency  Drinking water supply etc.
  50. 50. 50 PPT Downloaded from http://www.pravinkolhe.com/  Computer program developed in Design Division (WP), Central Design Organisation, Nashik was used for simulation study
  51. 51. 51 PPT Downloaded from http://www.pravinkolhe.com/ FRL (m) Storage (MCM) Area (Ha) Crop Water deman d (MCM) Drinkin g water (MCM) Total deman d (MCM) Total Evap (MCM) Total Utilisatio n (MCM) Succe ss 510.00 30.01 4400 39.19 0.60 39.79 1.36 41.15 46.0% 510.00 30.01 3515 31.84 0.60 32.44 1.77 34.21 78.5% 514.00 38.60 4400 39.19 0.60 39.79 1.87 41.66 75.0% 518.95 49.51 5500 48.98 0.60 49.58 1.63 51.21 57.0%
  52. 52. 52 PPT Downloaded from http://www.pravinkolhe.com/
  53. 53.  The net 75% and 50% dependable yield at Sapan medium project works out to be 30.77 MCM and 49.51MCM respectively as against 38.95 MCM and 50.04 MCM worked out in the project report  FRL of 510.0m can sustain irrigation up to 3575 Ha only  If area prepared in proposed report i.e. 4400 ha is considered for irrigation and if contents are not increased, the success rate comes to 46% only. 53 PPT Downloaded from http://www.pravinkolhe.com/
  54. 54.  If area as proposed in project report i.e. 4400 ha is considered for irrigation, to achieve 75% success the storage of the reservoir has to be increased from 30.01 MCM to 38.60 MCM. For this the FRL has to be increased by 4.5m.  If 50% dependable yield is proposed to be utilised the area of 5500 Ha can be irrigated at 57% success rate. For this the FRL of the reservoir is required to be raised by 8.95m 54 PPT Downloaded from http://www.pravinkolhe.com/
  55. 55.  As per the CWC working groups guidelines, if storage proposed to be provided more than 75% dependable net yield a minimum of 40 years runoff series is required to judge the performance of the project. In present case only 28 years data is available. 55 PPT Downloaded from http://www.pravinkolhe.com/
  56. 56. Special Thanks to-  Shri. H.T. Mendhegiri Saheb, Chief Engineer.  Shri. M.K. Pokale Saheb, Superintending Engineer.  Shri. V.G Kulkarni Saheb, Asst. Chief Engineer.  Shri. R.N. Sonawane Saheb, Executive Engineer, State Data Centre Division 56 PPT Downloaded from http://www.pravinkolhe.com/
  57. 57. 57

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