Class | Degree of reliability | Height (m) | Cover area | Area (KM2) |
A | Very Good | 800 - 1100 | 80.47 | 73.1725 |
B | Average | Under 800 | 67.49 | 30.1793 |
C | Weak | 1100 - 1400 | 61.10 | 36.383 |
D | Inappropriate | More than 1400 | 40.0 | 68.4 |