Where information on the genesis of the feature is available that is also given e.g. geological fault (FEA_GEN_TY). The rate of flow in m3 / second is specified if known.
Confidence is defined as follows: 1. High: Sampled feature with good age and palaeoenvironmental control. 2. Sampled feature with poor or none age and palaeoenvironmental control. 3. Constructed by remote sensing data only. 4. Low: Reasonable without any direct evidence.