WAPCO report not feasible: engineers
Draining surplus water into the sea only a temporary solutionRecords show such floods occur once in 10 years: AAI officialBest solution to build subsidiary reservoir near Pedagadili: engineers
VISAKHAPATNAM: The construction of a defined channel to drain the surplus water from Meghadrigedda reservoir into the sea could only be a short-term solution to avoid the inundation of the Visakhapatnam Airport and not a permanent one.
While a report submitted by WAPCO (Water and Power Consultancy), an agency employed by the State Government, says water could be flowed into the sea behind the airport, another study submitted by a panel of retired engineers of the irrigation department says the proposal is not feasible.
This difference of opinion raises a doubt in the minds of people as crores of rupees were being pumped by the Ministry of Defence, State Government and Airports Authority of India (AAI) for its expansion.
The panel comprising the former superintending engineer of the Irrigation Department, B. Brahmanaiah; executive engineers T.V.S. Sastri and N.S.R. Avadhanulu; and consulting engineer, S. Gopal Sastry had submitted a paper to the State Government indicating the lacunae.
According to them, the distance from Meghadrigedda reservoir to the sea is around 12 km., and as per the basic law of channelling water, the bed fall or slope should be calculated as one metre for every kilometre.
The bed level at the reservoir point is seven metres. So, by the time it touches the sea, the level goes below the surface area by minus five metres.
The general manager (engineering project) of AAI, H.S. Suresh, while saying it is only an apprehension, also added a word of caution that if there is a high tide during the floods then there could be a problem, as the receding time of the flood water would be slow.
On whether the airport is situated at the wrong site, he said it was the decision of the Government.
"We had submitted our reports and the Government had its own feedback. The decision was taken based on the history of floods which showed such flooding occurred once every 10 years."
According to Brahmanaiah and party, the best solution would be to convert 57.20 square metres of land immediately after the existing spillway, at the reservoir, to a 350 million cubic feet subsidiary reservoir near Pedagadili.
This would hold the excess water of both the Megadrigedda reservoir and the Kondagedda stream.
Surplus water from this reservoir could be diverted to the sea via a connecting drain to the Borramgedda that flows into the sea somewhere after the Visakhapatnam Steel Plant.