Stream preparing is the most difficult employment for building the nation's biggest scaffold as a result of the Padma's erratic qualities, riverbank disintegration, riverbed scouring and blaze surge, say specialists.
A wandering waterway, similar to the relentless Padma, streams in a crisscross, ceaselessly disintegrating its banks and changing its course.
Neighborhood and remote specialists have led a protracted and strenuous examination on the waterway's past and additionally its inclination for planning stream preparing, which for the most part incorporates riverbank insurance and checking scouring of the riverbed.
Arranging and actualizing waterway preparing for the Padma scaffold would be more troublesome than that in past extension ventures in Bangladesh, peruses a configuration stage report of the Extensions Division.
At first it was felt that a little scale waterway preparing would be required for the Padma span development and that too just on the south bank (Janjira end). In any case, after examination, specialists chose to lead a gigantic stream preparing along a 12.4km stretch at Janjira point and 1.6km at Mawa.
As indicated by a study, about a large portion of a-km stretch of the south bank has disintegrated following 2005.
The assurance of riverbank is the most pivotal part in waterway preparing, particularly on account of Padma extension, said Prof Md Sabbir Mostafa Khan of water assets designing at Bangladesh College of Building and Innovation (Buet).
Under the progressing waterway preparing, solid squares and rocks (extensive size stones) are being put on the riverbanks to shield them from disintegration.
"In the event that the bank insurance falls flat, the waterway course will change, debilitating the scaffold," said Prof Sabbir, a hydrologist with information on the way of the Jamuna and Padma.
He said the width of the Jamuna was decreased to 4.6km from 10km for development of the Bangabandhu span. In any case, the same wasn't possible in the event of Padma scaffold, as specialists think diminishing the waterway's width will expand the danger of riverbank harm.
Dr Maminul Haque Sarker, agent official executive of the Inside for Environment and Geographic Data Administration, who was included in outlining stage, said, "No issue will emerge if the nature of stream preparing work is guaranteed."
He said broad work is required at the Janjira end subsequent to the site is more powerless than Mawa.
Both the specialists said controlling the riverbed scouring is additionally essential for security of the extension.
"There ought to be no bargain on stream preparing. In the event that the occupation is not done legitimately, the riverbank will be moved and the scaffold will be at danger," said Prof Sabbir.
As a preparatory measure, additional viaducts will be put on both finishes of the scaffold considering that the extension would be sheltered regardless of the possibility that there is disintegration and harm of riverbanks in future.
China's Sinohydro Participation Ltd is doing the stream preparing at an expense Tk 8,707 crore.
Amid a late visit to the scaffold destinations, laborers were seen building around 80 lakh solid squares, which would be set on the riverbed and banks to control scouring, disintegration and surge in the range.
A Scaffolds Division designer said waterway disintegration and change obviously are continuous at Janjira site. Thus, an endless range at this end has been purchased under waterway preparing employment.
"The Janjira end is defenseless against disintegration and this is the reason we are additional wary while doing the waterway preparing employment," he told The Day by day Star at Janjira site.
Shafiqul Islam, executive of Padma extension venture, excessively distinguished stream preparing as one of the real difficulties due to the waterway's capricious conduct.
Neighborhood and outside advisors contemplated the waterway and composed the stream preparing.
"We are taking a shot at the endorsed plan. The unusual way of the waterway is dependably in our thought and we will take option measures if any emergency rises," he told this daily paper.
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