Efficiency Improvement of Large LI Schemes: Mhaisal Project, Maharashtra

 

Government of MaharashtraWater Resources Department

The Study

Necessity of Large LIS in Maharashtra

Necessity of efficient use of every drop in LIS.

Efficiency improvement with cost saving techniques adopted in Mhaisal LIS

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Study Area : Mhaisal LIS

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Rainfall Pattern in Deccan Plataue

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Satelite Image of Draught Area

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River pattern in Draught Area

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Diversity in Available water within 50 km

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Diversity in Available water within 50 km

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Large LIS for the Draught Area Total 11 No.Irrigation Potential 313474

haWater utilization

1810Mm3

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Necessity of Mhaisal LIS• Rain shadow area• No Gravity scheme possible due to River pattern

south to Nira Basin• To maintain socio economic balance • To avoid the migration of population in search of

food, water and employment• Meet minimum requirement of per capita and per ha

water availability

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Hugeness of Mhaisal LIS• Irrigation potential 81697 ha

• Water utilisation 491.576 Mm3

• No of villages benefited in 5 tahsils and 2 district 177• No of pumps 133• Power required 114433 Hp

(85.52 MW)

• Maximum lift 255 m• No of stages 6• Annual power consumption 384.56 Million

Units• NPV of project (2011-12 price level) Rs 29752.076

million   WRD, MAHARASHTRA

Schematic L Section of Mhaisal LIS

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Pumphouse in Stage I

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Cost Comparison of Gravity and LIS

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Special Need of Efficient water use in Mhaisal LIS

The unit costs are more than any gravity schemes.

Constraint by KWDT on water utilisation. Benefiting larger area and more population with

limited water resource.Energy saving and ultimately reducing carbon

credits. Depreciation value of pumps and other mechanical

and electrical components which is not there in gravity schemes

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Efficiency Improvement: Piped Network Bhose

• Salient FeaturesThis Disnet length 93.35 kmTotal irrigation potential 4541 ha. Drop of 15 on main lineDrop 22 to 30 m disnet

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Benefits Piped Network Bhose

Cost saving by Rs. 78.52 million Increase in velocity from 0.45 m/s to 0.90 m/s. Water saved by 3.025 Mm3 (100%) which goes in losses. Reduction in initial time to each tail reaches by 9.89 hrs.

Ultimately saving in power consumption. No land acquisition is required no oppose for work by

farmers, ultimately saved the time period of construction. Maintenance cost of pipe network system is very less. Management of irrigation in this system is easier than open

canal system.

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Efficiency Improvement: Piped Network Devnal

• Salient FeaturesThis Disnet length 120 kmTotal irrigation potential 4120 ha. Drop of 22 m on main lineDrop 25 to 30 m disnetNo of outlets 353

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Benefits: Piped Network Devnal

• Cost saving by Rs. 111.55 million• Increase in velocity from 0.60 m/s to 1.50 m/s.• Water saved by 0.334 Mm3 (100%) which goes in

losses.• Reduction in initial time to each tail reaches by

hrs. Ultimately saving in power consumption.• As no land acquisition is required no oppose for

work by farmers, ultimately saved the time period of construction.

• Maintenance cost of pipe network system is very less.

• Management of irrigation in this system is easier than open canal system.

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Efficiency Improvement: Piped Network Gavan

• Salient Features4 pumps of 425 HP each This Disnet length 39.6 kmTotal irrigation potential 1700 ha. Pipe dia 350 mm to 1200 mmIrrigation is proposed by drip only15 m head is maintained at each outletNo seepage or transit losses. 

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Efficiency Improvement: Lined Jat Canal

• Salient Features This canal has length 83 km Total irrigation potential on this canal is 34460 ha. The canal crosses so many ridges and valleys.

Benefits of Linining Bottom width reduces 9.20 to reduces to 2.60 m Velocity of flow increased due to reduction in rugosity (0.60 m/s

to 0.90 m/s) This increased velocity reduced the cross section and ultimately

the wetted perimeter. The loss of water is reduced lining itself, by reduction in wetted

perimeter and reduction in flow period. Total saving of water per rotation is 3.23 Mm3 in 12.45 Mm3,

(25.94 % ) Cost saving by Rs. 611.7 million

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Efficiency Improvement: Lined Disnet

• Salient Features This Disnet length @ 600 km Total irrigation potential on this canal is 34460 ha. Drop of 50 to 80 m from main canal to tail

Benefits of Lining Bottom width of 6 m which reduces to 1.45 m in lined disnet Velocity of flow increased due to reduction in rugosity (0.60 m/s

to 0.90 m/s) Advantage of drop of 50 to 80 This increased velocity reduced the cross section and ultimately

the wetted perimeter. The loss of water is reduced lining itself, by reduction in wetted

perimeter and reduction in flow period and the. Total saving of water per rotation @ 40 % ) Cost saving by Rs. 210 million

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Other Efficiency Improvement Means in Mhaisal L I S

• Impelling farmers to grow cash crops

Implementing Drip and Sprinkler Systems

Volumetric Distribution of Water

Formation of WUA during construction for efficient use under MMISF.

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Efficiency Comparisons

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Efficiency Comparisons

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CONCLUSIONS It is essential to have large LIS in drought prone area like Mhaisal LIS

where, other gravity schemes are not possible, for justice and avoid migration of population in search of food, water and employment.

In large LIS like Mhaisal, irrigating to drought prone area with limited water resources due to constraint of KWDT, it is essential to have efficient water use.

Every drop saved is like, every drop generated, because water is costly in per view of capital and O&M cost; water is priceless if availability is considered; and water is life for those whom water is supplied additionally with saved water.

As the unit costs of large LIS are higher than gravity schemes, they should be designed with precision

With precised design schemes become economically feasible.

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CONCLUSIONS

• It is proved in Mhaisal project that lining of canals, piped network system are economical than conventional system.

• It is not always true that, lining of canals and pipe networks are costly.

• Taking into advantages of topography and design techniques these costly means found to be cheaper.

• Cost Saving in this 4 proposals is Rs 900 millions • Water saving is from 30 to 50 % in Mhaisal Project. • Use of drip or sprinkler system should be made compulsory

for large LIS.• Public private partnership is essential for efficient use of

water.

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