To find the diameter of a circle when given the area, we can use the formula for the area of a circle:
\[ A = \pi r^2 \]
where \( A \) is the area and \( r \) is the radius. We can rearrange this formula to solve for the radius:
\[ r^2 = \frac{A}{\pi} \]
Now, plug in the area:
\[ r^2 = \frac{674}{\pi} \]
Using \( \pi \approx 3.14 \):
\[ r^2 \approx \frac{674}{3.14} \approx 214.66 \]
Taking the square root to find the radius:
\[ r \approx \sqrt{214.66} \approx 14.65 \]
The diameter \( d \) is twice the radius:
\[ d = 2r \approx 2 \times 14.65 \approx 29.3 \]
Rounding to the nearest meter, the diameter is approximately:
\[ \boxed{29} \]