empolder

As verbs the difference between drain and empolder

is that drain is to lose liquid while empolder is to construct polders in order to drain land.

As a noun drain

is a conduit allowing liquid to flow out of an otherwise contained volume.

As a noun polder

is (geography) an area of ground reclaimed from a sea or lake by means of dikes.

As a verb empolder is

to construct polders in order to drain land.

As verbs the difference between empolder and impolder

is that empolder is to construct polders in order to drain land while impolder is to empolder.