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Dear Michael

My understanding of the justification for a well head is that it needs to achieve the following

• The platform is raised slightly above the surrounding land so surface water drains away from the well, prevents erosion and muddy depressions forming around the wellhead and provides a good sanitary seal to prevent water flowing directly into the well
• It provides good access to all users including the old, young and disabled
• It protects well head from damage by cattle.
• It allows access to the well for maintenance or deepening

So provided the platform achieves this, there is no rule that says it needs to be circular or a certain size. The dimensions and the design should, I suggest, be driven by the needs of users. A 2m diameter platform provides a 1 metre space around the pump which is probably assumed to be the space required to collect water on.

Regards

Ian