Officials said people of the flood affected areas in Bangladesh are returning home as flood situation is improving.
“Flood in northeastern and northern region is improving gradually as both Bangladesh and upstream regions of India witnessed less rainfall in the past three days,” Flood Forecasting and Warning Centre (FFWC) spokesman Md Arifuzzaman Bhuyan told BSS.
“Country’s major rivers are flowing below danger levels… meaning flood situation is in improving trend,” he added. Bhuiyan, an FFWC executive engineer, said heavy downpour inside Bangladesh and upstream region of India triggered the devastating flood in Bramaputra and Meghna basins.
Monsoon rains and gushing water from upstream India worsened the flood situation in Bangladesh with experts calling it the worst since the 2004 floods.
Northeastern and northern parts of Bangladesh may witness prolonged flood as record breaking rainfalls were recorded inside Bangladesh and upstream states of India during the ongoing flood.
“We have seen that both Bangladesh and upstream states of Meghalaya and Assam and western Himalayan regions of India recorded heavy rainfall, the highest over 100 years,” professor Md Mansur Rahman of Institute of Water and Flood Management of BUET said.
Major rivers and their tributaries of Bangladesh have no capacity to contain such huge volumes of rain, which ultimately has caused massive flooding in northeastern and northern regions of the country, he added.
Mansur said there is a huge gap between Bangladesh and upstream regions of India in terms of elevation from sea level. “So, onrush of water enters Bangladesh at a faster pace, which inundated vast areas of the country in a short time,” he added.
The hydrologist said a large number of embankments have been built in both Bangladesh and India to control flow of water of major rivers, which are the main reasons for increasing frequency of flooding.
The ongoing flood in Meghna basin may prolong as, “the only exit point of flood water is Bhairab at the Meghna river, which will take much time to pass such huge volume of flood water into the Bay of Bengal... meaning flood in northeastern region is likely to be prolonged, if the heavy downpour continues.”
Water levels at 15 river stations monitored by Flood Forecasting and Warning Centre (FFWC) have marked rise while 91 stations recorded fall.
Among the 109 monitored stations, three river stations have been registered steady while water levels at seven stations are flowing above the danger level, a bulletin issued by the FFWC said on Sunday.
The Surma at Kanaighat, the Kushiyara at Amalshid and Sheola, the Old Surma at Derai, the Baulai at Khaliajuri, the Someswari at Kalmakanda and the Titas at Brahmanbaria are flowing above danger level by 75cm, 169cm, 60cm, 30cm, 17cm, 39cm and 25cm respectively.
All the major rivers in the country are in falling trend, the FFWC bulletin added.
The Brahmaputa-Jamuna, Ganges-Padma and all the major river of the north-eastern region of the country may continue falling in the next 48 hours, while the Dharala and Dudhkumar rivers of northern Bangladesh may continue falling in next 24 hours, it added.
In the next 48-72 hours, there is a chance of heavy rainfall at places of the Sub-Himalayan West-Bengal (Jalpaiguri, Sikkim). As a result, the water level of Teesta river may rise and get close to danger level at Dalia Point.
Flood situation in the Sylhet, Sunamganj, Netrokona, Kishoreganj and Brahmanbaria districts may continue improving in the next 24 hours, the FFWC bulletin said, adding, there is a chance of short duration flood in the low-lying areas of Shariatpur and Madaripur districts in next 24 hours.