noun
dug well
Refers specifically to a well that has been dug, as opposed to a drilled or natural spring.
この村には古い掘り井戸がまだ残っている。
An old dug well still remains in this village.
井戸 is the general term for a well, while 掘り井戸 specifies a dug well.
Compound of 掘り (hori, 'digging') + 井戸 (ido, 'well').