De or het polderbemaling?

The correct Dutch article is:

de polderbemaling

Rule Words ending in -ing: almost always de. See the rule

How to use polderbemaling

the polderbemalingde polderbemaling
this polderbemalingdeze polderbemaling
that polderbemalingdie polderbemaling
our polderbemalingonze polderbemaling
your polderbemalingjouw polderbemaling
every polderbemalingelke polderbemaling
which polderbemaling?welke polderbemaling?
a big polderbemaling / the big polderbemalingeen grote polderbemaling, de grote polderbemaling