DHUKWAN SHP

  • Govt of UP has entrusted implementation of 24 MW Dhukwan Small Hydro Project to THDCIL. Project is located near village Sukhwan-Dhukwan in Tehsil Babina, in Jhansi district of Uttar Pradesh on river Betwa. Implementation agreement was signed between GOUP and THDCIL on 2nd Sep’09.
     
    Project is about 37 Km from Jhansi on Jhansi-Lalitpur road. The nearest rail head is Jhansi. The project site falls in the survey of India toposheet No. 54 K/12/NW and is connected with all weather metalled road. The geographical co-ordinates of the project site are latitude 250 12′ E and longitude 780 33′ N.
     
    The project as envisaged in DPR prepared by THDC India limited is of 24 MW capacity, utilizing the storage of existing reservoir of Dhukwan masonry cum Earthen Dam.  The length of the Dam is 2972 m. The gross capacity of the existing reservoir is 5780 MCum with top F.S.L. 273.7 m.
     
    The construction to be under taken shall comprise of (±) 1433m long head race channel, 4nos of RCC Intake barrels, Forebay, Penstock three numbers of 4.0 m dia each, Surface Power house with three units of 8 MW capacity vertical Kaplan turbine and a (±) 961m long Tail race Channel.. The estimated generation from this project at 46.53% load factor is 97.82 Million units.
     
    The project does not involve any R&R works. 39 Ha forest land is required for Project works. Stage-I Forest clearance for the same has been accorded by MoEF on 27.11.12. Final(2nd Stage) Forest diversion has been cleared by Central Nodal Forest Officer, Lucknow and letter has been sent to Principal Secretary (Forest), Govt of UP on 17th Sep-13for further necessary action. The project can be implemented within a time period of approx. 30months.
     
    Investment approval of the project has been accorded by THDCIL Board at an estimated cost of `  195.42 Cr including IDC of `  12.89 Cr in Mar, 2011 at April, 2010 PL. Equity portion i.e. 30% of the Project cost shall be funded by the Corporation from its internal resources
  • I.         GENERAL
    1.      LOCATION:
    State                                                  :           Uttar Pradesh
    District                                                 :           Jhansi
    Tehsil                                                   :           Babina
    Village                                                 :           Sukwan Dhukwan
    River                                                   :           Betwa
    Access                                                            :           30km from Jhansi through     road
    Nearest rail head (B.G.)                      :           Jhansi
    2.      GEOGRAPHICAL CO-ORDINATES:
    Latitude                                               :           25°12’E
    Longitude                                            :           78°33’N
    Reference Toposheet No.                  :           54 K/ 12/ NW
    3.      DAM  (Existing):
    (Existing Dhukwan Dam is 2972 m long Masonary cum Earth & Rockfill Dam across river Betwa.)
     
    Catchment Area                                 :           21, 34, 160 Ha
    Gross Capacity                                   :           5780 MCM
    Spillway Crest Level               :           271.27 m
    F.S.L.                                                  :           273.70 m
    H.F.L.                                                  :           275.55 m
    Top Level                                            :           277.00 m
    Length of Masonry Dam                     :           1172 m
    Length of Earthen Dam                      :           1800 m
    Submergence Area                            :           1943 Ha.
    Maximum Height of Dam                   :           8.22 m
    No. & Size of Spillway Gates             :           383 no.  (10 ft wide & 8ft high)
    Design Discharge of Spillway             :           15, 260 cumecs
    4.      HYDROLOGY:
    Catchment Area at Dam Site             :           8240 sq. miles (21, 24, 160 Ha)
    Type of Catchment                             :           Rugged and hilly
    Rainfall                                               :            Dam is existing across river betwa and releases from reservoir are proposed to be passed through the Power House. The discharges of the river at dam site and releases from dam are available for the years 1990 to 2009.
    Maximum Flood Discharge              :             20,000 cumec (6.42 lacs cusecs observed in the year 1983). This is the maximum observed since 1961.
    Reservoir Capacity                            :            2.04 T.M.C.
     
    5.      RESERVOIR:
    F.R.L.                                                 :           E L   273.70 m
    MDDL                                                 :           E L   268.30 m
    Minimum Tail Water Level                  :           E L   251.70 m
    HFL in D/S of TRC                             :           EL    258.50 m
    II.          PROJECT FEATURES
    1.      SUPPLY/ APPPROACH CHANNEL:
    Shape                                            :           Trapezoidal
    Bed width                                      :           24.00 m
    Bed Slope                                     :           Horizontal
    Bed level                                       :           264.50 m
    Length                                           :           540 m in existing reservoir
    Side Slope                                     :           1.5 H: 1.0 V
    2.      REINFORCED CEMENT CONCRETE BARRELS:
    Shape                                            :           Rectangular
    Size                                               :           4.5 m (w) x 5.5 m (H)
    Bed Level                                      :           265.50 m
    Length                                           :           42 m
    No. of Barrels                                :           4
    3.      HEAD RACE CHANNEL:
    Design Discharge                        :           160 cumec                          
    Shape                                          :           Trapezoidal
    Bed Width                                    :           6.00 m
    Bed Slope                                    :           1 in 4000
    Bed Level D/S of Barrels                        :           265.50 m
    Length                                          :           1750 m
    Berm Level (1.0 m wide)             :           270.00 m
    Side Slope                                   :           1.0 H: 1.0 V upto  Berm Level
                                                                     1.5 H: 1.0 V above Berm Level
    Free Board                                  :           1.50 m
     
     
    Top Level                                     :           275.0 m
    Depth of Flow                              :           8.00 m      At intake
    FSL                                              :           273.50
    Lining Thickness                          :           100 mm (C.C. M-15)
    4.      FOREBAY :
    FSL in Forebay                            :           EL 273.00 m
    MDDL in Forebay                                    :           EL 267.70 m
    Design Discharge                                    :           160.00 cumec
    Free Board                                   :           1.50 m
    Material                                        :           Stone Masonary/ Cement Concrete
    Storage Capacity                         :           19200 cum
    Length of Forebay                       :           95.00 m
    Width of Forebay                         :           39.60 m
    Height                                           :           16.00 m
    Top Level of Forebay                  :           EL 274.50 m
    Bed Level near Penstock                        :           EL 258.50 m
     
     
     
    5.      PENSTOCK:
    Shape                                           :           Circular
    Size (Dia.)                                    :           4000 mm
    Nos.                                              :           3
    Length                                          :           100.00 m
    Thickness                                     :           12 mm
    Material                                        :           Mild steel
    Design Discharge                                    :           53.33 cumecs for each Penstock
    Intake Level at Forebay               :           258.50 m
    6.      POWER HOUSE:
    No. of Machines                          :           3
    Type of Machines                                    :           Kaplan
    Power House                               :           Surface Power House
     
    Head                                          
                 Gross (weighted)                         :           20.60 m
    Design                                          :           17.85 m
     
    Size of Power House             
                       Length                                          :           64.0 m
                       Width                                            :           24.0 m
    Deepest Foundation Level           :           240.40 m
    Top Level of Power House          :          277.00 m
    Level of Centre line of M/c          :           249.70 m
    Erection Bay Floor Level             :          261.5 m
    Installed Capacity                                    :           3 x 8 MW
    7.      SPILLWAY AT FOREBAY:
    Crest Level of Spillway                :           269.80 m
    Design Discharge                                    :           176 cumec
    Nos. of Gate                                :           2
    Pier Thickness                             :           2.0 m
    Size of Gate                                 :           9.5 m (W) X 3.2 m (H)
    8.      SPILL CHANNEL:
    Shape                                           :           Trapezoidal
    Length                                          :           280 m
    Width                                            :           21 m
    Design Discharge                                    :           176 cumec
    Side Slope (H: V)                         :           1:1
    Bed level at D/S end                    :           258.00
    Bed Slope                                                :           1:320
    Water Depth                                 :           1.80 m
    9.      TAIL RACE CHANNEL:
    Length                                          :           650.0 m
    Shape                                           :           Trapezoidal
    Discharge                                     :           160.00 cumecs
    Bed Slope (S)                              :           1/1000
    Side Slope (H: V)                         :           1:1
    Bed Width                                                :           30 m
    Bed level at D/S end                    :           251.00 m
    Water Depth                                 :           2.1 m
    10. CROSS DRAINAGE WORKS:
    At Kappa Nala
     
    Nos. of Barrels                            :           4 Nos.
    Width of Barrels                           :           3.5 m
    Height of Barrels                         :           3.0 m
    Length of Barrels                         :           80 m each
    Bed Level of Barrels                    :           ± 258.50 m
    Materials                                      :           RCC (M-25)
     
    At Nala-1, 2 & 3
    Nos. of Barrels                            :           01
    Size                                              :           3.5 m (W) X 3.0 m (H)
    At  Nala-4
    Nos. of Barrels                            :           02
    Size                                              :           3.5 m (W) X 3.0 m (H) each
    11. HYDRO-MECHANICAL WORKS:
     
    i)       Barrel Gates
    a.                  Type of Gate                                       Fixed wheel with upstream skin                                                                                             plate and upstream     seals.
    b.                  No. of bays                                          4 (four)
    c.         Clear width                                          4.50 m
    d.         Clear height of gate                            5.50 m
    e.         Sill level                                               265.50 m
    f.          Maximum Water Level                       273.70 m (FRL)
    g.         Design head                                        8.2 m
      h.     Type of wheel assembly                    Wheel mounted on corrosion resisting Steel axle with roller bearings and having line contact with track.
           i.          Type of side and top seals                              Rubber, music note    (hollow).
           j.          Type of bottom seal                            Rubber, wedge
           k.         Lowering/raising speed of hoist          50 cm/minute
           l.          Centre to centre side seals                 4500+ 150 mm
           m.        Centre of the centre wheels/tracks    4500 + 400 mm
           n.         Approx weight of each gate                15 tonne
           o.         Approx hoist capacity for each gate   25 tonne
     
    ii)     Trashracks at Intake structure of Forebay
    a.            Type of trash rack                                          Inclined
    b.         No. of bays                                                     9 (nine)
    c.         Clear width                                                      3.4 m
    d.         Total vertical height of trash rack                   16.2 m
    e.         Sill level                                                           258.50 m
                f.          Full supply level                                              273.00 m
                g.         HFL                                                                 273.0 m
                h.         Differential head for design                            6 m
                i.          Approx. weight of one section of                    2.5 tonne
                            Trash rack considering six (6)
                            Sections per bay
                           
    iii) Intake Gates at Forebay
                a.         Type of Gate                                       Fixed wheel with downstream
    skin plate and downstream seals.
                b.         No. of bays                                                     3 (three)
                c.         Clear width                                                      3.32 m
                d.         Clear height of gate                                        6.30 m
                e.         Sill level                                                           258.50 m
                f.          Full Supply Level                                            273.00 m
                g.         Design head                                                    14.5 m
    h.          Type of wheel assembly                                Wheel mounted on corrosion resisting Steel axle with roller bearings and having line contact with track.
    i.          Type of side seals                                           Teflon cladded, rubber, music note (solid).
                j.          Type of bottom seal                                        Rubber, wedge
                k.         Lowering/raising speed of hoist                      50 cm/minute
                l.          Centre to centre side seals                             3320 + 150 mm
                m.        Centre of the centre wheels/tracks                3320 + 400 mm
                n.         Approx weight of each gate                            15 tonne
       o.         Approx hoist capacity for each gate               30 tonne
     
    iv)            Draft Tube Gates
                a.         Type of gate                                                    Vertical lift, slide type                                                                                                              downstream skin plate and                                                                                                     downstream sealing,
                                                                                        non regulating type                                                                 
                b.         No. of bays                                                     Six of clear width of 4.2 m each
                c.         No. of gates required                          Two seal gates having bottom,                                                                                               side & top isolating one unit.
                d.         Total height of one gate                                  3.20 m + requirement for                                                                                                        top seal
                f.          Sill level                                                           244.0 m
                g.         Max. TWL                                                       258.00 m
                h.         Design head                                                    14.00 m
    i.                     Type of side & top seals                                 Rubber, music note (hollow)
                j.          Type of bottom seal                                        Rubber, wedge
                k.         Lowering/raising speed of hoist                      0.75 m/minute to 1.5 m/minute
                l.          Centre to centre side seals                             4200 + 150 mm
                m.        Centre to centre thrust pads                           4200 + 400 mm
    n.         Approx. weight of each gate                           8 tonne
     
    v) Automatic Tilting Gates at Spill Channel
                a.         Type of Gate                                       Fish belly with upstream skin                                                                                                  plate Automatic with counter                                                                                                  weight
                b.         No. of bays                                         2 (two)
                c.         Clear width                                          9.5 m
                d.         Clear height of gate                            3.2 m
                e.         Sill level                                               269.80 m
                f.          Maximum Water Level                       273.00 m (FRL)
                g.         Design head                                        3.2 m
     
    12. ELECTRO-MECHANICAL WORKS:
    i)   Characteristic of Turbine
                a.         Type                                                    :           Kaplan (Vertical)
                b.         Nos.                                                     :           3
    b.         Runner dia.                                         :           2.7 mc.            Operating load range                          :            40% to 110%d.            Permissible speed rise                        :           Not more than 50 %e. Permissible pressure rise               :           Not more than 40% of design                                                                                                 headf.  Turbine efficiency                               :           92 %
               
    ii)     Characteristic of Generators
     
    a.                  Type                                                    :           Three phase synchronous
    b.                  Rated output at 0.9 pf lag and
    normal rated terminal voltage             :           8.88 MVA
                c.         Continuous overload capacity            :           10%
                d.         Normal rated terminal voltage            :           11 kV
                e.         Rotational speed                                 :           187.5 rpm
    f.          Rated frequency                                 :           50 Hz
                g.         Short circuit ratio on                           
                            rated MVA base                                  :           1.0
    h.         Efficiency at 8.88 MVA,
    0.9 pf lag, 50 Hz, not less than           :           98%
     
    iii)   Characteristic of Generator Transformers
    a.                  Type                                                    :           Three phase   
    b.                  Rating                                                  :           9.78 MVA
    c.                  Cooling type                                        :           ONAN/ONAF
     
    iv)   Switchyard
                Voltage level                                                   :           11/132 kV
    a.                  No. of bays                                          :           3
    b.                  Size                                                     :           65 m (L) x 55 m (W)
     
    13. ANNUAL ENERGY GENERATION
    At 46.53% load factor                                       :           97.82 Million units
    (As per availability of water)
     
    14. COST ESTIMATES
    (i)                  Total Cost                                              :           182.53 crores
    a)      Civil works                                       :           127.62 crores
    b)      E&M Works                                     :           54.91 crores
    (ii)                IDC                                                        :           12.89 crores
    (iii)               Subsidy                                                 :           11.70 crores
    (iv)              Total Cost considering                          :           183.72 Crores
                          IDC and subsidy
    (v)                Cost of installation per MW                   :           7.65 crores
     
    15. GENERATION COST/kW
                At 46.53% load factor                                     :           Rs. 3.63
                (As per availability of water)
     
    16. RETURN ON EQUITY (pre-tax)                 
    a.      For first 10 years                                             :           19 %
    b.      11th year onwards                                          :           24 %
    17. CONSTRUCTION PERIOD                          :           30 months    
     




Updated on : 18/02/2018