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Effective and Economic Canal, Lining for Minor Irrigation System

H. R. Molla
Senior Scientific Officer
Irrigation and Water Management Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh .

M. J. Islam
Senior Scientific Officer
Irrigation and Water Management Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh .

Abstract/ Executive Summary:

A study was conducted at Bangladesh Rice Research Institute farm, Gazipur to determine the suitable indigenous low cost materials such as clay and clay mixed with rice husk linings in different ratios for small scale irrigation canal lining. During the study period five lining materials and their durability at field level were tested. The study indicated that the clay lining of 10.0 cm. thick is more suitable for small scale irrigation system in respect of cost and seepage loss reduction. However, l.3 cm thick cement sand plaster in 1:3 ratio is promising though the cost is 3.5 times higher than the clay lining. Moreover, durability of cement sand plaster lining is more than clay lining and it can resist the various types of field hazards.

Keywords: Effective and economic canal, Lining, Rice husk, Minor irrigation

Location: BRRI, Gazipur

Start Date: 00-00-1989

End Date: 00-00-1991

Program Area:

Commodity: Water management

Objectives:

l. To identify the appropriate and economic, durable canal lining materials to reduce the seepage loss

2. To study the performance of the selected linings under field condition.

Methodology:

This study was conducted at BRRI farm, Gazipur in 1989-91 with five treatments, each replicated three times. Trapezoidal canals were excavated and constructed for this purpose with the following dimensions: bed width, b = 25.40 cm: side slope, s = 1:1; length of the canal, L = 2l.33 m; depth of the canal, D = 25.40 cm; and bed slope = 0.1 percent.The canals were excavated on an elevated land to avoid groundwater interference. The depth of water table below the ground surface ranged form 5.1-12.7 m (BRRI, 1990). So, it could not contribute moisture to the canal by capillary action, as capillary action usually acts up to 1.5 m. The textural class of the experimental area soil containing 30.038% clay, 23.75% silt and 45.87% sand. The lines join at a point which lies within the class sandy clay loam according to the U. S. D. A. soil textural classification chart. Distance between two adjacent canals was 1.8 meter. Initially the land has been dried and cement sand plaster lining was made according to treatment T₁ and T₂ after the compaction of unlined and uncovered with brick canals. Clay and clay-rice husk in appropriate ratios were mixed thoroughly to get a workable pasty mixture with the help of hand and spade and used the material as lining the canals for treatments T₃, T₄ and T₅. After compaction of canal construction, the canals were sun dried for several days. Then the canals were filled with water to a desirable depth. Over a period of time, the depth of water in the canals decreased gradually due to seepage through the bottom and sides of the canals. The seepage rates through the sides and bottom of different types of lining were measured by ponding method. To determine the suitability of different linings, a curve was developed on the basis of seepage rates through the lining and elapsed time. The following equation was used for computation of seepage rate: S= (W(dl- d2)L )/PLt.

Source of Information: Bangladesh Rice J. 3(1&2): 39-43, 1992

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Seepage loss of unlined canal is always higher than that with lining. Among the lining materials, 1.3 cm cement sand plaster in 1:3 ratio gave the lowest seepage loss. Clay lining of 10.0 cm thick is more suitable for small scale irrigation system in respect of cost and seepage loss reduction. Findings also reveal that l.3 cm thick cement sand plaster in 1:3 ratio is promising though the cost is 3.5 times higher than the clay lining. Durability of cement sand plaster lining is more than clay lining and it can resist the various types of field hazards.

Knowledge Management: Journal