As first reported by Motorsport.com, the plan to seal the drains was proposed by F1 stakeholders on the final day of the three-day test last week.
Testing was heavily disrupted when a drain cover on the approach to Bahrain’s Turn 11 was forced loose.
In a Bahrain race preview statement, the FIA has now revealed that “following incidents in last week’s pre-season test sessions, remedial works, including the filling in of drains with concrete, have been carried out”.
This means the drivers will not be required to alter their lines at Turn 11 – where they have been drifting right to begin turning in for the long, sweeping and uphill left-hander from the approach kerbs.
Taking this line keeps the drivers within track limits as their inside wheels remain inside the white line that defines the track edge but allows them to maintain higher speed and protect their tyres thanks to the increased cornering angle.
The concrete works have also taken place on “an additional area around Turn 7”, per the FIA statement.
Extra welding work has also been conducted on other drain covers around the track where the cars and their powerful ground effect floors that can force the metal loose traverse the respective drains and kerbs less often.
The work at Turn 7 in Bahrain concerns the racing line exiting the fast, downhill left-hander – where the cars often run out wide and hard over the exit kerbs and where there is a line of drain covers that could be impacted by repeat exposure to the ground effect forces.
The concrete filling plan has been made possible because there is no rain forecast to impact the F1 race weekend, as occurred dramatically during the Bahrain pre-season test for the Formula 2 and Formula 3 championships earlier in February.
Elsewhere, F1 race director Niels Wittich’s event notes remind the teams and drivers that “in accordance with the provisions of Article 33.3, the white lines define the track edges” and “during qualifying and the race, each time a driver fails to stay within the track limits, this will result in that lap time being invalidated by the stewards”.
