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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 Region of Sonagazi Area-2012

Dr M A Rashid
CSO and Head
Irrigation and Water Management Division, BRRI, Gazipur-1701, Bangladesh

Dr Hamidur Rahman Molla
PSO
Irrigation and Water Management Division, BRRI, Gazipur-1701, Bangladesh

Abstract/ Executive Summary:

An investigation was carried out to assess the potentiality for development of suitable groundwater; 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 pump was discharging groundwater with salinity level ranged from 0.30 to 0.57 dS/m which was fresh and much below the permissible maximum limit (<4 dS/m). BRRI dhan28, BRRI dhan47 and BRRI dhan55 were grown during Boro sason, 2012. The yield of those varieties were 5.52 t/ha, 5.27 t/ha and 5.70 t/ha respectively. All the varieties performed well in irrigated condition. The mono-cropped area has been converted into a double cropped area which is a good news for the coastal saline areas. The adjacent farmers have started installing tubewells for irrigating Boro rice. Performance of the tubewell is satisfactory. The 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: 01-07-2011

End Date: 30-06-2012

Program Area: Crop-Soil-Water Management

Commodity: Tubewell

Objectives:

To assess the potentiality for development of suitable groundwater;
To test the performance and cost-effectiveness of tubewell irrigation;
To monitor the long-term effect of groundwater extraction in coastal saline areas.

Methodology:

The study was conducted in Sonagazi area under Feni district. It is a saline area where only one T Aman rice is grown under rainfed condition. As a result it is a mono-crop area. The vast fields are kept fallow during dry season due to lack of suitable irrigation water. Therefore, a test well having 7 cm diameter was designed and installed at BRRI Regional Station Sonagazi in April 2009. The total depth of the well was 180 m (600 ft). The strainer was placed at a depth from 162 m to 180 m (530 ft to 590 ft). So the length of the strainer was 18 m (60 ft).

Source of Information: Proceedings of the BRRI Annual Internal Review for 2012, BRRI, Gazipur-1701, Bangladesh

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 pump was discharging groundwater with salinity level ranged from 0.30 to 0.57 dS/m which was fresh and much below the permissible maximum limit (<4 dS/m). BRRI dhan28, BRRI dhan47 and BRRI dhan55 were grown during Boro sason, 2012. The yield of those varieties were 5.52 t/ha, 5.27 t/ha and 5.70 t/ha respectively. All the varieties performed well in irrigated condition. The mono-cropped area has been converted into a double cropped area which is a good news for the coastal saline areas. The adjacent farmers have started installing tubewells for irrigating Boro rice.

Knowledge Management: Report/Proceedings