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HYDROCHEMISTRY OF LOWLANDS WATER OF SOUTHWEST BANGLADESH Muhammad Qumrul Hassan
Lowland Technology International Vol 2 No 1, June (2000)
Publisher : International Association of Lowland Technology

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Abstract

The paper presents the physical properties and chemical constituents of surface and groundwater of southwest lowland area. Annual seasonal and tidal flooding are the common phenomenon in lowland of Bangladesh. Monson climatic condition is the main responsible for the flooding both from onshore to offshore areas. These physical processes, the regional hydraulic head declination during the dry period (November-April) and some man-made activities have caused the present deterioration of water quality from the acceptable limit for conjunctive use of the area. Physico-chemical analyses of water from river and groundwater have revealed that EC, TDS, TH, Na+, CT are higher concentration levels then the standard limit. In thois context, many studies on water quality have revealed that the surface water of southwestern lowland is of primary salinity type, which can be found in the every dry period. Observation shows that the salinity level normally decreases when the high stream flow discharges from the upstream rivers during the very wet periods.
ESTIMATED CONSUMPTIVE USE AND FIELD IRRIGATION REQUIREMENT FOR RICE DURING THE DRY PERIOD: A CASE STUDY IN THE GANGES LOWLAND REGION OF SOUTHWEST BANGLADESH Muhammad Qumrul Hassan
Lowland Technology International Vol 3 No 1, June (2001)
Publisher : International Association of Lowland Technology

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Abstract

This paper deals with the Consumptive Use (U) and the Field Irrigation Requirement (FIR) for rice crop during the dry period of the Jessore district in the Ganges lowland of southwest Bnagladesh by using the Blaney-Criddle Method. The estimated U ranges from 3.11 mm/d in December to 7.65 mm/d in April. The minimum and maximum estimated FIR for rice crop in the months of December and April is about 3.54 mm/d and 6.61 mm/d, respectively. The total seasonal FIR is about 807 mm for rice crop during the present dry period. The above results may prove useful for the future planning of a rice crop-design calendar of the Jessore district during the dry period