a decorative pond which includes a pond area , a water feature for discharging water into the pond and a skimmer construction for receiving pond water , separating debris from the pond water and recirculating filtered water to the water feature . the skimmer construction includes : a housing which defines a fixed pond - water receiving aperture , an internal assembly positioned adjacent the fixed aperture defines a movable pond water receiving aperture that is selectively positionable relative to the fixed aperture . the combination of the fixed and movable apertures define an inlet opening to the skimmer for receipt of pond water in said housing . a debris collection member is positioned rearwardly of the inlet opening to receive incoming pond water from the inlet opening so as to collect debris . a controllably positionable discharge assembly is provided in association with the skimmer construction so as to permit control of water levels in the skimmer .