The drop pipe is the pipe the pump is hung on down the well; that assumes a submersible pump. The power cable is taped or otherwise attached to the drop pipe. Without a drop pipe, there's no way to 'support' a submersible pump in a well. You will need a drop pipe even if the well overflows 24 hrs/per day (a true artesian well [IMO]).
Submersible pumps have a check valve in or on the outlet; so there is no "foot valve".
I forgot about the problem Bob mentions of submersible pumps in 4" PVC casing but I do not like steel casing but that's based on 'potable' water quality issues.
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