Employment element - Having looked at the site from an ordinary watercourse, surface water and ground water flooding point of view we have the following comments:

Drainage Category 1 - Easily drained and sustainable drainage could be implemented easily

Reason - Highly variable permeability.  Infiltration/soakaway test required and consider whether infiltration can be used as a SuDS technique alongside water storage (in ponds/chambers) and re-use.