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Impact of Lined Canal on Shallow Tubewell Irrigation and Their Acceptability by the Farmers

Abu Sayed
Assitt. Professor
Department of Agricultural Engineering, Exim Bank Agricultural University;

A. F. M Saleh
Department of IWFM, BUET, Dhaka

Md Altaf Hossain
Department of Farm Structure, Sylhet Agricultural University;

Zobayer Ali Basunia
Rangpur PBS-2, Paglapir, Rangpur;

MA Hossain
SSO
WMM Division, BRRI, Gazipur-1701, Bangladesh

Abstract/ Executive Summary:

The comparative conveyance losses between lined and unlined canals, impact of water saving on command area development and irrigation cost, and farmers’ acceptability of lined canal in shallow tubewell (STW) irrigation schemes were studied during 2010-11 Boro season. The conveyance loss was measured using inflow-outflow method and focus group discussion (FGD) was carried out with the pump owners and farmers to assess the impact of water saving on command area development and the acceptability of lined canal technology. Average conveyance losses were found to be 41, 48 and 45% in the existing earthen canals; 18, 21 and 24% in improved earthen canals; and 12, 11 and 13% in pre-cast canals at Mithapukur (M1), Manikgonj Sadar (M2) and Dhamrai (D) schemes, respectively. On an average, 32, 23 and 30% fuel were saved by improved earthen canals where as 45, 46 and 48% were saved by pre-cast canals for M1, M2 and D schemes compared to earthen canal. The benefit-cost ratios of improved earthen canals were 1.36, 1.38 and 1.30 where as 3.36, 4.28 and 3.34 by pre-cast canals for M1, M2 and D schemes, respectively. The internal rate of return from the investment on water distribution was over 50%.

Keywords: Lined canal, Shallow tubewell, Irrigation

Location: Manikganj and Rangpur

Start Date: 00-00-2010

End Date: 00-00-2011

Program Area: Crop-Soil-Water Management

Commodity: Water management

Objectives:

To assess the impact of water saving by canal lining on command area development and irrigation cost
To determine the economic benefits and farmers’ acceptability of lined/improved canal.

Methodology:

The Department of Agricultural Extension is involved in experimentation of improved water distribution system in order to develop different low cost canals for minor irrigation schemes. As of now, the DAE through its AETEP has implemented several new technologies in respect of lining of irrigation canals. These linings are superior to the traditional earthen canal, especially in respect of efficiency. In this study, the linings recommended by AETEP were constructed and field tested in order to assess their impacts over the traditional earthen canals. The study was undertaken in 2010-11 Boro season at three upazilas: Manikgonj sadar of Manikgonj district, Dhamrai of Dhaka district and Mithapukur of Rangpur district. Nine improved earthen canals, three pre-cast lined canals and six existing earthen canals under STW were selected for field study.

Source of Information: The Agriculturists, 12(2), 2014: 116-125

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The highest of 48% water loss and saving of irrigation water (37%) were found by earthen canal and pre-cast canal, respectively in Manikgonj sadar. The pre-cast canal on average saved 43% and improved earthen canal saved 24% irrigation application time as compared to earthen canal. The pre-cast canal and improved earthen canal also saved 46 and 28%, respectively, of fuel cost and, consequently, saved the operation and maintenance cost. But the saved water through lining was not however used for expanding the command area. Among the two types of lined canals, the values of the economic indicators used (BCR and NPW) were the highest for pre-cast concrete lining. The lined canal technologies offered by the AETEP are only acceptable to pump owners and only those farmers who pay the price of irrigation by supplying the fuel. Based on the technical and economic performances, it can be concluded that lined canal technologies are suitable for shallow tubewell irrigation schemes. But, in order to make the technologies acceptable to the farmers, the benefit of lining must be shared among the stakeholders (pump owners and farmers).

Knowledge Management: Journal