Economic analysis of lining in water conveyance canals of Borujen

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TAVAKOLI E.; GHORBANI B.; TAVAKOLI A.

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Journal: IRANIAN WATER RESEARCH JOURNAL Year:2019 | Volume:13 | Issue:3 (34) Page(s): 117-126

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Title

Economic analysis of lining in water conveyance canals of Borujen

Author(s)

TAVAKOLI E. | GHORBANI B. | TAVAKOLI A. | Issue Writer Certificate

Keywords

Earth canalQ1

Gandoman and Boldaji irrigation and drainage networkQ1

Lined canalQ1

Physical modellingQ1

Abstract

Considering the vital importance of water in arid and semi-arid regions like Iran, conservation and optimal use of water resources is necessary. In this regard, increasing the conveyance efficiency and reducing water losses in distribution canals are very imperative. Low water conveyance efficiency in distribution canals is mainly due to seepage losses in channels. However, since infiltration and seepage cause groundwater recharge, it is sometimes beneficial. Reviewing the literature revealed that some experts believe lining channels is not justified, technically and economically. Other experts do not reject lining at all, however, suggested that since seepage could help groundwater recharge indirectly, in regions which there is no ponding problem, the channel lining should be justified economically. In addition, another group of researchers found that although the lining construction costs seem very high, is economic, considering its long term benefits for countries with vital need for water in future such as Pakistan and Iran. Meanwhile, according to some studies, the concrete lining is not economically justified. Based on numerous different and sometimes opposite opinions regarding economic justification of lining, it seems necessary to investigate this issue on regional scale. Thus, the current study aimed at economic analysis of infiltrating water from unLined canal to the groundwater and pumping again through wells to the surface, in comparison with lining canals and not allowing to seep. In order to do this research, the concrete canal of modern Irrigation and Drainage network of Gandoman and Boldaji, Borujen city, Chaharmahal and Bakhtiari province, with 1. 3 m width, 1. 8 m depth and 6. 5 m top width, was chosen as prototype. In order to analyze the lining, this channel was compared with an Earth canal, having the same dimensions. The soil texture was determined using hydrometer method, which was obtained as loam that was constant to the water table depth (6. 79 m from soil surface). In order to estimate the amount of seepage in the earth channel, using Physical modelling and dimensional similitude relations and considering 0. 13 as scale ratio, dimensions and discharges of Lined canal have converted to laboratory dimensions at Soil Mechanics Lab of Shahrekord University. The lining lifetime was selected 10, 20 and 40 years, and the interest rates were 12, 15 and 18 percent. Based on the results obtained, the measured seepage loss in experimental flume of laboratory for the unlined and Lined canal was 26 and 11 percent, respectively. According to the calculations, the price of groundwater in the study region is nearly 0. 24 cents per cubic meter. Considering the low depth of groundwater in the study area (6. 79 m), this small value, in comparison with the price of surface water (0. 31 cents per cubic meter), will justify. According to ‘ base unit price index for irrigation and drainage works’ , the costs of earth and Lined canal construction with 3000 m length, 6. 5 m top width and 1. 3 m bottom width, were calculated and obtained as 10768 and 91060 M. Rials, respectively. It has been noticeable that for construction of both types of canals, half of cutting practices have considered in stony lands and the remaining in earth lands. Furthermore, the renovation and maintenance costs for unlined channel were taken into consideration, which have been applied from year 1 to 10, 20, and 40 years. These costs have increased by the rate of 15% per year (according to the inflation rate). The results showed that increasing the interest rate from 12 to 18% has been resulted in decreasing both NPV and B/C values (except for B/C in concrete-Lined canal, 40 years). On the other hand, increasing the lining lifetime from 10 to 40 years (constant interest rate), the NPV and B/C values were increased at first and then were decreased. Investigating the calculations showed that after 30 years, with maximizing the maintenance costs of Lined canal, its costs exceed its benefits. Therefore, lining canal with the mentioned properties will not be economical after 30 years. Consequently, with all lifetime values, the Earth canal is more economic than the lined one, considering both economic indices and for all interest rates. Therefore, it could be concluded that when the water table depth is 6/79 m and it is possible to pump the infiltrated water from well (while the canal is unlined with a loam soil), which are the properties of Borujen region in the current study, lining with concrete is not justified economically.

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APA: Copy

TAVAKOLI, E., GHORBANI, B., & TAVAKOLI, A.. (2019). Economic analysis of lining in water conveyance canals of Borujen. IRANIAN WATER RESEARCH JOURNAL, 13(3 (34) ), 117-126. SID. https://sid.ir/paper/159866/en

Vancouver: Copy

TAVAKOLI E., GHORBANI B., TAVAKOLI A.. Economic analysis of lining in water conveyance canals of Borujen. IRANIAN WATER RESEARCH JOURNAL[Internet]. 2019;13(3 (34) ):117-126. Available from: https://sid.ir/paper/159866/en

IEEE: Copy

E. TAVAKOLI, B. GHORBANI, and A. TAVAKOLI, “Economic analysis of lining in water conveyance canals of Borujen,” IRANIAN WATER RESEARCH JOURNAL, vol. 13, no. 3 (34) , pp. 117–126, 2019, [Online]. Available: https://sid.ir/paper/159866/en

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