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Monitoring of Groundwater Level at Different BARI Stations (2019-2020)

M. A. Hossain
CSO and Head
IWM Division, BARI, Gazipur

S. K. Biswas
SSO
IWM Division, BARI, Gazipur

D. K. Roy
SSO
IWM Division, BARI, Gazipur

K. F. I. Murad
SO
IWM Division, BARI, Gazipur

S. S. A. Kamar
SO
IWM Division, BARI, Gazipur

K. K. Sarker
SSO
HRC, BARI, Gazipur

F. Akter
SO
IWM Division, BARI, Gazipur

M. A. Rahman
SO
RARS, Barishal

Abstract/ Executive Summary:

This study was conducted at the research fields of Irrigation and water Management Division (IWM) and RARS, Rahmatpur, Barisasl of Bangladesh Agricultural Research Institute (BARI) during 2019-2020. Two observation wells were installed at these two locations for regular monitoring of groundwater level fluctuations. In IWM Division research field, a boring depth of 210 ft. with a strainer length 20 ft. was found sufficient for the purpose of groundwater level monitoring. At RARS, Rahmatpur, Barishal, the boring depth was 860 ft with a strainer length of 20 ft It is noted that the boring depth and the strainer length depends on the underlying water bearing strata. The installation of observation wells at other stations is ongoing. The monitoring of groundwater level fluctuations in the installed observation well at IWM Division and RARS, Eahmatpr, Barishal has been continuing.

Keywords: Groundwater, Depletion of groundwater, Cost effective, Drawdown-recovery, Hydrogeological

Location: The research fields of Irrigation and water Management Division (IWM) and RARS, Rahmatpur, Barisasl, BARI, Gazipur, Bangladesh

Start Date: 00-00-2019

End Date: 00-00-2020

Program Area: Crop-Soil-Water Management

Commodity: Groundwater, Water management

Objectives:

The following objectives:
1) Installation of observation well at different BARI stations
2) Regular monitoring of groundwater level at 7 days’ interval
3) To determine the depletion of groundwater level

Methodology:

The evaluation of groundwater issues and the implementation of management solutions require hydrogeological data that are in part ‘baseline’ and in part ‘time-variant’. The collection of the ‘time-variant component’ (groundwater level monitoring, groundwater quality monitoring, water well abstraction monitoring (direct or indirect), well groundwater level variations, river flow gauging, meteorological observations and satellite land-use surveys) is what is usually considered ‘groundwater monitoring’. Groundwater monitoring thus comprises the collection, analysis and storage of a range of data on a regular basis according to specific objectives. The type and volume of data required will vary considerably with the management issue being addressed, but is also inevitably dependent upon available financial resources. At the heart of all groundwater investigation and monitoring are wells, of the two basic types indicated below. They represent keyholes to aquifers, which allow groundwater pressure and quality measurements to be made and thus furnish information from which the health of the aquifer system can be judged. When water wells are drilled, they provide one-off unique in-situ data on the groundwater resource and its variation with depth and data acquired during drilling (borehole logging) and initial test pumping form key baseline reference information on groundwater quantity and quality, in addition to their value for the determination of abstraction well potential. However, data collected from water wells once operational are normally more difficult to interpret, because groundwater levels are affected by the drawdown-recovery cycle and pumped-sample quality reflects the variable mixing of groundwater from a wide range of aquifer depths and residence times. The observation wells are dedicated monitoring stations, sited and designed to detect potential changes in groundwater flow and quality design parameters include selection of depth for the intake screen, frequency of measurement (if not continuous) and selection of quality parameters. To overcome the widespread presence of depth variation in hydraulic head and/or groundwater quality, nested piezometers or well clusters can be used. Piezometer nests are more cost effective than observation well clusters, but should only be used if proper sealing can be achieved to prevent vertical flow between their screens. As part of the continuing work, one observation well was installed at the research field of IWM Division, BARI, Gazipur. The another one was installed at the research field of the RARS, Rahmatpur, Barishal. Ground water level fluctuation data at 7 days’ interval have been measuring since the installation of the observation wells.

Source of Information: Annual Research Report 2019-2020, Irrigation and Water Management Division, BARI, Joydebpur, Gazipur

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Two observation wells, one at at IWM Division, BARI, Gazipur while the another one at RARS, Rahmatpur, Barishal were installed thus far. Therefore, the results presented in this report were based on these installed observation wells. The study should be continued for performing the installation of other observation wells at other BARI stations.

Knowledge Management: Report/Proceedings