The following information relates to recording the spatial relationship between boundaries in a clear and unambiguous manner in a CSD.
Recording boundary relationships
Depiction of the spatial relationships between boundaries [r 9.6.3(f) and (g)] is primarily through the pictorial display of the boundaries in diagrams.
The diagrams must depict all of the boundaries that are relevant and display the relationship between them. This applies in a horizontal and vertical context. The boundaries cannot be shown in isolation or not shown and merely referenced to preceding CSDs.
The spatial relationships must be clear and unambiguous [r 9.6.15(a) and r 10.4.10(a)]. Cross-sections are often an appropriate method of depicting the relationship between stratum boundaries or between upper and lower permanent structure boundaries.
The depiction of boundaries in a plan graphic [r 9.6.9] without dimensions is all that is necessary where there is a mixture of permanent structure boundaries, and mathematically described boundaries (eg right lines or reduced levels), and the relationship between the boundaries is clear and unambiguous.
Note, where there is a risk of a boundary overlap or where the gap between two boundaries is not clear and unambiguous, more information is required [r 9.6.9(b)]. In some cases, this could be horizontal or vertical dimensions.