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Right to Information Presantation on RTI Act The Act No 22 2005 RTI Directory IGNB

Design of Canal

  1. Finalise proposed cropping pattern after irrigation with consultation of Agriculture officer of the area.
  2. Calculate crop water requirement and get it vetted by the Agriculture Department.
  3. Calculate proposed area to be irrigated from available live storage.
  4. Determine C.C.A by adopting suitable intensity of irrigation (60% to 65%).
  5. Survey the CCA in a grid of 30m x 30m with a contour interval of 0.30 m.
  6. Prepare sajra sheet of command area by plotting grid lines on combined village sajras and mark contour lines.
  7. Mark proposed canal alignment on sajra sheet; it may be contour canal or ridge canal as per terrain of command area. Ridge canal should be aligned to cover area on both sides.
  8. Formation of chaks including position of outlets. Chak size should be equal as far as possible. Size of chaks should be 40 ha approximately.
  9. Prepare draw off statement as per proforma enclosed, by adding seepage and evaporation losses @ 8 cusec and 2 cusec per million ft2 of wetted perimeter for unlined and lined canals respectively.
  10. Fix canal capacity for different reaches and design the most economical section keeping ratio of hydraulic mean depth and full supply depth near to 0.50 as per Chief Engineer I.D.&R. (Irrg) unit, Jaipur letter no. 833 dated 2.2.2002 and letter no. 1378 dated 2.3.2002.
  11. Canals should be aligned as far as possible in partial cutting and partial filling.
  12. For future development, canal sections and pucca structures be designed for 10% additional discharge.
  13. For design of canal section, rugosity coefficient for unlined and lined canals should be as per table given below:
Unlined section depending upon type & strata of bed and sides and design discharge 0.025 to 0.035
Lined channel  
  Cement 0.018
  Masonary side walls with concrete in bed 0.02
  1. Maximum permissible velocity for unlined canals recommend by CWPRS Pune for different type of soils as below should be adopted: (Ref: Theory and design of irrigation structure, R S Varshney, S C Gupta, R L Gupta vol I)
    Ordinary soil 0.60 to 0.90 m/sec.
    Very light, loose and to average sandy soil 0.30 to 0.60 m/sec.
    Sandy loam, black cotton soil & similar soil 0.60 to 0.90 m/sec.
    Murrum, hard soil 0.9 to 1.1 m/sec.
    Gravel and disintegrated rock 1.5 m/sec.
    For lined canals, limiting velocity should be 2 m /sec.
  2. Side slope, free board, bank width etc. should be adopted as per IS code: 10430-1982 (Criteria for design of lined canals and guidelines for selection of type of lining).
  3. As far as possible minimum number of falls should be provided.
  4. No fluming should be provided in falls, culverts and other pucca structures.
  5. Canal may be lined in reaches of excessive seepage losses. Canal should also be lined 15 meter upstream and 30 meter downstream of all pucca structures. However the lining should not be provided in more than 25% length of minor.
  6. The lining with masonry walls and concrete in bed should be preferred due to saving in land width, durability, convenient to cultivators etc.
  7. The water course should be lined in initial 50-meter length and in heavy filling reach.
  8. Well type falls should be properly designed and proper energy dissipation arrangements should be provided, upstream and downstream wings in a suitable length should be provided.
  9. Pipes should not be used in any masonry structures across a canal i.e. in head regulator, road bridges, syphons etc. Only slab type openings should be provided across the canal, to avoid head loss and blockage of pipes by mischievous farmers.
  10. Minimum difference in FSL of minor and water course should be 0.30 metre.
  11. FSL in water course at head should be kept at least 0.30 metre above the selected highest natural surface level in the irrigable area of particular chak plus drop in the water course due to slope.
  12. Cultivators should be educated to use water efficiently by land leveling, boarder irrigation method, educating them to use proper quantity of water at proper time, use of tensiometer for indication of water requirement of plants etc. for optimum use of available water.
  13. The water course is to be constructed upto sub chak (size 5- 8 ha).
  14. Minimum chak size should be so kept, as discharge required for outlet is 0.50 cusec.
---------------------------------------- Minor Irrigation Project
Draw off Statement of ----------------------- ----------------- Main Canal / Minor
Chak No. (L / R) Off take R.D. Reach G.C.A ha C.C.A. ha I.C.A. ha Required discharge cumec Losses cumec Total discharge cumec Design discharge adding 10% in Col(9) cumec
Design Parameter
Bed Width
m
FSD
m
Bed Slope Side Slope Velocity m/sec

Discharge
cumec

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Nodal Officer

Nodal Officer :Vimal Kumar Meena, S. E. e-Governance, 5167550, 9414049705  Email : seegovjp.wr@rajasthan.gov.in.

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