Minimum discharge
= 45000 m3 /sec
Average maximum discharge
=38000 m3 /sec (October-1985)
Average minimum discharge
=9000 m3 /sec (May-1987)
Bangladesh Water Development Board (BWDB) is maintaining a hydrological gauge station (No-90) which is located nearby Sirajgonj. Water level discharge and sediment are measure regularly by this gauge station. 3.3.3
Ground water
Ground water is generally a stable source of water for both domestic use and irrigation purposes. In the project area of Tangail and Sirajgonj ground water mainly has been developed for domestic use. No data was available about the quantity of ground water in project area. However it reported that in the project area the arsenic level in ground water exceed the permissible limit of 0.05 mg/l causing health hazards to its consumers. 3.3.4
Climate:
The area has a tropical monsoon climate with dry and moderately hot weather from March to May (the pre monsoon season), a rainy season from June to October (the wet season), and dry and cool winter from November to February (the winter season). During the pre monsoon season temperature was highest and the rainfall was about 12% of the annual total. During the monsoon period temperature decreased and humidity increased. The wind velocity was high and sunshine duration was low. The mean annual rainfall of the project area was about 1700 mm of which 82% falls in the wet season with only 6% in dry season. The mean annual temperature was around 26° C with peak of over 42° C in April to June while in the winter the temperature did not go below 12° C in January. Generally, the climate was favorable for agriculture throughout the year. 3.3.5
Surface water
Surface water was abundundant during monsoon and scarce during dry season. Surface water was used for irrigation at the both side of the river. The water of Jamuna was suitable for irrigation but high turbidity during flood. Water sample taken from Jamuna river and were analyzed in the laboratory for water quality test and the water was found suitable for irrigation purpose. Table: 3.12 Analysis of water sample from Jamuna river Parameter
Units
PH value
Results 7.9
Turbidity
mg/l
18.0
SS 105
mg/l
44.0
SS 500
mg/l
< 1.0
Ammonical N
mg/l
<0.05