OPERATION & MANAGEMENT OF L.I.SCHEMES-CASE STUDY OF

SLBC PUMPING SCHEME

NALGONDA DISTRICT IS A CHRONICALLY

DROUGHT PRONE AREAWITH HIGH FLUORIDE CONTENT IN GROUND

WATER

TO MITIGATE THIS PROBLEM

SLBC SCHEME IS TAKEN UP

SLBC Scheme has 2 alternatives

1.Gravity from Srisailam Reservoir

2. Lift from NagarjunaSagar Reservoir

Lift Scheme has been taken up in 1995 and later it was renamed as AMR Project.

SLBC LIFT SCHEME IS

THE BIGGEST SINGLE STAGE LIFT SCHEME

IN ASIA

SLBC LIFT SCHEME

Aim : 1) To provide irrigation (ID) to 2.20 lakh acres2) To provide drinking water to516 villages

SLBC LIFT SCHEME

• COMPONENTS• APPROACH CHANNEL • APPROACH TUNNEL• SURGE POOL• PUMP HOUSE • DELIVERYMAINS• CISTERN• LINK CANAL• AKKAMPALLY BALANCING RESEVOIR • MAIN CANAL

APPROACH CHANNELAPPROACH CHANNEL

Length : 3.325kmBed width : 15mFSD : 4mDischarge:3000c/s

APPROACH TUNNEL

Length : 1.475kmShape : CircularDiameter : 6mLining : 300mm ThickBed Fall : 1 IN 288

INTAKE STRUCTURE

SURGEPOOL

Size : 20mX50mX62mBottom Level : +138.00mDraft Tube Gates : 2.60mX5.00mWeight of each gate : 8.07MT

PUMP HOUSE

Size : 16mX60mX65mBottom Level : +135.00mPumps : 4No.s of 18MW eachCapacity of each pump: 600 CusecHP of each Pump : 25000

DELIVERY MAINS

Size : 2.50m dia CircularLength : 655mNo. of rows : 4No.sSteel : IS 2002 Grade-IIIThickness of Plates : 14mm

& 16mm

Cistern Reservoir Bund

Length of Dam : 2.290kmCapacity : 0.28TMCFRL : +247.00mTBL : +249.00m

LINK CANAL

Length of Canal : 9.260 kmDischarge : 2400 CusecBed Width : 20.00 mFSD : 3.00 mBed fall : 1 in 7000

A.M.R.P. Main Canal From Akkampally Balancing Reservoir

Surplus EscapeMain Canal Regulator

H.Ps of Main CanalAt Km 25.000 (Common point)

• Discharge: 65.258 Cumec

• Bed Width: 19.10 m • FSD : 3.10 m• CBL @ starting: +230.100 m

PUMPS

• Type of Pump : Vertical shaft single stage Francis Type Runner

• Normal speed : 428.60 RPM• Rated Discharge : 16.85 Cumec (600 cusec)• Guide vane centre line : +142.00m• Submergence of GV

central line below min. water level : 11.00m• Allowable frequency : 50.5Hz to 47.50Hz.

MOTORS

• Type : Vertical shaft AC motor• Speed : 428.60 RPM• Power : 18 MW – 11 KV• Frequency : 50 Hz• Pf (leading) :0.95

SALIENT FEATURES

• MDDL : +155.45m• Max. Elevation to be pumped :249.00m • Maximum Static Head : 96m• Minimum Static Head :69m• Cost of the Scheme :Rs.1026 Crore• Cost of Head works

up to Cistern intake :Rs.300 Crore

DESIGN OF PUMPS

• Capacity of Pump = 9.81XQxHX1.25 KW » Efficiency

where Q= Discharge in cumec

H= Dynamic Head in m

Capacity of Pump = 9.81X16.85x81X1.25 / 0.92

18191KW or Say 18MW

• Though pumps are designed for 18MW , the input is about 15 MW only

• These pumps function from 69m static head to 96m static head• The discharge varies with reference to variation in head and

frequency• Guide vane opening is to be adjusted as per head and frequency

FEATURES OF PUMPS

Dynamic head

100m 81m 74m

In Put 15.02MW 15.24MW 15.10MW

Discharge in cumec

13.68 16.85 17.90

Efficiency 89.3% 87.8% 86%

Guide vane opening

60% 80% 90%

ENERGY CALCULATION

• Energy Required (E)= QxWXH

60X60XEfficiency

where Q= Quantum of water in million cum

W =9.81KN/m3

H= Dynamic Head in m

E= Energy in million KWH

ENERGY REQUIREMENT

• Energy requirement for the scheme is worked out based on the average levels of Nagarjuna Sagar Reservoir.

• The quantum of water to be lifted is 22TMC• Energy required for the scheme is 135Million KWH• Cost of Energy Charges per annum is Rs.34 Crore (Rate per

unit:Rs.2.36)• Maintenance charges including staff : Rs.3.00 Crore per annum• Cost of Maintenance & Energy Charges per Acre is Rs.1680

S NO FINANCIAL YEAR

WATER LIFTED

( TMC)

APPROX. ENERGY

CHARGES ( Rs in Crore)

1 2001-02 2.66 5.32

2 2002-03 0.952 1.90

3 2003-04 4.559 9.10

4 2004-05 14.58 26.24

5 2005-06 17.06 30.70

SLBC LIFT SCHEME-YEARWISE WATER LIFTED & ENERGY CHARGES

Thank You