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Design, Installation and Test the Performance of a Stw to Explore the Fresh Groundwater Resources for Increasing Crop Production in Coastal Saline Area-2011

Dr M A Rashid
CSO and Head
IWMD, BRRI

Dr Hamidur Rahman Molla
PSO
IWMD, BRRI

Dr A Latif Shah
CSO & Head
Soil science Division, BRRI

Abstract/ Executive Summary:

An investigation was carried out to assess the potentiality for development of suitable groundwater; to find out the potentiality of irrigated rice based crop production by using newly installed tubewell water; to test the performance and cost-effectiveness of tubewell irrigation; and to monitor the long-term effect of groundwater extraction in coastal saline areas. It was found that a good water bearing aquifer exists at a depth from 155 m to 180 m (510 ft - 590 ft). The initial EC of the water of this aquifer was 0.37 dS/m which is excellent for irrigation. At present the pump is discharging fresh groundwater. BRRI dhan28, 29 and 47 varieties were grown during Boro season 2011. Therefore, the mono-crop area has been converted into a double or triple-crop area which is good news for the country. The adjacent farmers have started installing tubewells for irrigation purpose. Growing rice in dry season is a blessing for the coastal area farmers. The yield of BRRI dhan28, 29 and 47 were 5.09 t/ha, 6.45 t/ha and 5.34 t/ha respectively. Therefore, all the varieties performed well in irrigated condition which was supplied from this newly installed STW. The salinity of irrigation water ranged from 0.37 to 0.56 ds/m which was far below the permissible maximum limit (<4 dS/m). The STW can also be used for supplemental irrigation in Aman season. Therefore, year round crop production is possible with this irrigation water. Performance of the tubewell is satisfactory. These findings may be disseminated to other areas where similar condition exists. But long-term effects of groundwater extraction in coastal saline areas should be monitored.

Keywords: STW, Groundwater level, Coastal zone, Saline water, Aquifer

Location: Sonagazi, Feni

Start Date: 00-00-2011

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Command area development

Objectives:

To assess the potentiality for development of suitable groundwater.
To find out the potentiality of irrigated rice based crop production by using newly installed tubewell water.
To test the performance and cost-effectiveness of tubewell irrigation;.
To monitor the long-term effect of groundwater extraction in coastal saline areas.

Methodology:

Source of Information: Proceedings of the BRRI Annual Internal Review, 2011

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It was found that a good water bearing aquifer exists at a depth from 155 m to 180 m (510 ft - 590 ft). The initial EC of the water of this aquifer was 0.37 dS/m which is excellent for irrigation. At present the pump is discharging fresh groundwater. BRRI dhan28, 29 and 47 varieties were grown during Boro season 2011. Therefore, the mono-crop area has been converted into a double or triple-crop area which is good news for the country. The adjacent farmers have started installing tubewells for irrigation purpose. Growing rice in dry season is a blessing for the coastal area farmers. The yield of BRRI dhan28, 29 and 47 were 5.09 t/ha, 6.45 t/ha and 5.34 t/ha respectively. Therefore, all the varieties performed well in irrigated condition which was supplied from this newly installed STW. The salinity of irrigation water ranged from 0.37 to 0.56 ds/m which was far below the permissible maximum limit (<4 dS/m). The STW can also be used for supplemental irrigation in Aman season. Therefore, year round crop production is possible with this irrigation water. Performance of the tubewell is satisfactory. These findings may be disseminated to other areas where similar condition exists. But long-term effects of groundwater extraction in coastal saline areas should be monitored.

Knowledge Management: Report/Proceedings