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Irrigation Schemes

The rehabilitation works on irrigation schemes in non-canal commanded area would be somewhat different than the conventional improvement of canal commanded watercourses. Mostly, piped water distribution networks will replace the existing earthen channels. In case, the cultivatable area is at higher elevation than the water source, irrigation of fields is carried out by lifting the water.

Components 
Irrigation scheme generally includes, inter alia, following components:

  • Lifting of the irrigation water from the natural nallahs and low-lying water ponds through pumping devices
  • Conveying the water to the fields situated at higher elevations through GI and PVC pipes
  • Supplying water to the fields of lower or equal elevation through open channels
  • Connecting different fields having depressions in between through RCC or PVC pipes
  • Providing nakkas and turnouts at water distribution points

Tube well Operated Watercourses
There are a large number of tube wells installed in non-canal commanded areas for pumping irrigation water. Their watercourses pass through uneven topography or loose soil and a lot of water is wasted during its transit. The combined effects of leakage, wastage, and seepage result in heavy losses of water. The opportunity for increasing agricultural production by reducing this colossal wastage is, therefore, quite enormous. The watercourse renovation would consist of complete demolishing of watercourse and its rebuilding/re-aligning would be carried out according to engineering design. Parts of reconstructed watercourses are lined and necessary water control structures are installed to improve conveyance of irrigation water.

 

 
Watercourse Improvement in Non-Canal Commanded Areas

Renovation Procedure
The procedure for rehabilitation/development of irrigation schemes and tube well watercourses is given below:

  • The OFWM staff mobilizes shareholders of each irrigation scheme/watercourse to organize water users associations (WUA). The same is registered under OFWM and W.U.As Ordinance [Act] 1981 (Amended 2001)
  • The WUA executes, facilitates, monitors and supervises the works for their quality and is also responsible for dispute resolution, provision of land for irrigation scheme/watercourse right of way, and labour cost for installation of water control structures, lining etc. as well as material cost over and above the government assistance
  • After completion of earthen watercourse construction, nakkas are installed and culverts are constructed.
  • The lining of critical reaches of watercourse is provided subsequently
  • The OFWM staff provides technical assistance to WUA for watercourse development activities. DDO (OFWM) makes frequent visits at the sites to ensure that field staff is regularly supervising the works and prescribed standards / specifications are being followed. Moreover, the DDO submits the completion report to the Consultants for final verification.

Cost Sharing Arrangements
The government provides entire cost of construction materials besides providing technical guidance while the beneficiary farmers contribute entire labour costs for improvement of unimproved watercourses as well as completion of improvement works on partially improved watercourses as per following provisions. Farmers contribute entire labour costs for 

  • Demolishing and reconstruction of katcha watercourse
  • Excavation for the portion to be lined
  • Back earth filling of structures and lined section
  • Masons and unskilled labour of all civil works