A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Hasan, M. A.
- Saline Ground Water Management in Manda Thana of Naogaon District, NW Bangladesh
Authors
1 Department of Geology, University of Dhaka, Dhaka 1000, BD
2 Dept. of Geological Sciences, University College, London, Gower Street London, WCIE 6BT, GB
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 51, No 1 (1998), Pagination: 49-56Abstract
The study area is dependent on ground water for irrigation during the dry months of the year as sufficient surface water resources are not available. Occurrence of saline ground water in some parts of the area, particularly at Kashopara and Kasab unions. restricts the use of ground water for irrigation purposes. Ground water electrolytic conductivity (EC) monitoring and resistivity sounding show a distinct vertical ground water zoning with varying salinity, viz .. an upper zone (0-30 m) of relatively fresh Na/CaHCO3-type ground water with EC values <1000 μS/cm and a lower zone (below 30 m) of NaCI-type (brackish) ground water with EC values >2000 μS/cm. It is suggested that salinity prohlems in the affected area can be managed through minimum abstraction of saline ground water, proper selection of crops, land development and by changing methods of irrigation.Keywords
Hydrogeology, Ground Water, Salinity, Ground Water Management, Bangladesh.
- Effect of Urbanisation on Groundwater Regime, Dhaka City, Bangladesh
Authors
1 Department of Geology, University of Dhaka, Dhaka 1000, Bangladesh, IN
2 Groundwater Circle. Bangladesh Water Development Board, 72 Green Road, Dhaka, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 52, No 2 (1998), Pagination: 229-238Abstract
Groundwater abstraction in Dhaka city has increased more than 700% during the last three decades. Consequently, water level has dropped to 20 m below sea level in the south central part of the city, where the ground surface elevation is 5.7 m. The rate of water level decline varies from 0.75 to 1.5m/year at different observation points within the city.
Iso-conductivity map of the groundwater depicts higher electrolytic conductivity (EC) value (500 to 800 μ1S/cm) in the southern part of the city, particularly along the river Buriganga. compared to the northern part (l00-2oo μ1S/cm). Contamination in the aquifer of southern part is attributed to recharge by polluted water from the Buriganga. Monitoring results of deep tube wells (DTWs) and hand tube wells (HTWs), located in municipal waste and industrial effluent disposal sites, show a marked depth variation in groundwater EC. Higher EC values in the HTWs demonstrates contamination in upper part of the aquifer from the disposal sites. Major ions and trace element concentrations of the water samples also reveal similar pattern. Increasing trend in the ionic concentrations. particularly cl- and N03 , as observed in the historical record indicates gradual quality deterioration.