Transmissivity Range (m²/sec)

Water Transmitting Capacity

T < 1 × 10⁻³

Poor

1 × 10⁻³ < T < 5 × 10⁻³

Medium

5 × 10⁻³ < T < 1 × 10⁻³

Good

1 × 10⁻² < T

Very Good