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Sounds to me like galvanised pipe if it is simply laid on ground to give some measure of security, with break pressure tanks to keep static pressure within pipe capacity and to give taps a chance if the pipeline supplies tap stands or similar.

Design will also have to look at flow velocity which risks to be very high (danger of physical erosion of pipe) given fall of nearly 1:12, also need to keep the pipes flowing full if at all possible to avoid air locking (ignore this risk at your peril!), so might have to put in more break pressure tanks than necessary simply to keep static pressure within pipe capacity.

Re air locks, laying pipe to a constant fall so far as possible rather than simply on a straight line horizontally may be important if the fall is not constant.

Difficult to say much more without further details of anticipated pipe flow and profile ground between source and delivery point, and whether to tap stands or other.

Best regards

Tim Foster