The phrase "a flat level" is correct and usable in written English.
It can be used to describe a surface or area that is even and without any elevation or depression.
Example: "The construction team ensured that the foundation was a flat level before proceeding with the building."
Alternatives: "an even surface" or "a level plane".
But when he takes a flat, level swing, his wrist feels fine.
Features of the dray included smaller wheels than those used on other wagons, a flat, level floor, and, usually, no sides.
Also, there is no need to select the desired transducer power gain level; the proposed technique naturally provides a gain curve fluctuating around a flat level.
And so on 6 May 1954, almost exactly 184 years after James Parrott's first four-minute mile, Roger Bannister became the first amateur to run a mile in four minutes on a flat, level 440-yard track.
Based on noise level analysis using the amplitude decay curve (Fig. 3), the trace length applicable to SAP analysis is about 10 s in two-way travel time; amplitude decreases with increasing travel time and asymptotically approaches a flat level at about 10 s, which represents the level of noise in the data acquisition system.
Sit upright on a flat, level surface with your knees bent and feet flat on the floor.
We had a flat-level coaching structure where eight different people were reporting to Martyn and I could see him being pulled into all directions.
The depth of the movie is reduced to a flat surface-level movie about a young girl and hockey.
President George W. Bush used the same messaging in 2005, when he proposed radically converting Social Security to a flat, subsistence-level benefit, with private savings layered on top.
This project extended the research to the Cumberland Plateau region of Kentucky, where flat, level-bedded sedimentary rocks are dominant.
There was a knee-jerk pop in stock futures immediately after the GDP report, before they settled back to flat levels.
