referring to fig1 there is shown a decorative pond system 10 generally which includes a body of water 12 which fills an excavation . the excavation is provided with a liner 14 and appropriate rocks or gravel 16 and 18 . appropriate vegetation , 20 and 22 is also provided . the pond system includes a waterfall filtration system such as 24 and shown in u . s . pat . no . 5 , 584 , 991 . an inlet pipe 26 is shown whereby pond water is recirculated to the bottom of the waterfall 24 . a skimmer construction 28 ( which is sometimes referred to as the skimmer box and rests in an excavation ), is shown , and includes an inlet opening 30 whereby pond water enters the skimmer construction , is filtered and recirculated therefrom . a skimmer recirculation pipe 32 directs incoming pond water into the waterfall pipe 26 . it will be appreciated that this system provides a closed recirculation system whereby undesirable materials can be filtered from the water and refiltered water returned to the pond . the exterior of the skimmer construction is shown in fig2 . the construction includes a shaped and somewhat box - like housing 34 that defines a fixed inlet aperture 36 in the front wall 37 of the housing . a bottom wall 38 is also provided . the housing is hollow or box - like shaped and includes an open top which is covered by faux stone cover 40 which is intended to hide or camouflage skimmer in the vegetation - like setting . a frame 42 is provided for bolting to the housing about the fixed inlet aperture 36 . the plastic liner 14 is positioned about the aperture 36 and is trapped and bolted in place using the frame 42 . open top which is covered by faux stone cover 40 which is intended to hide or camouflage skimmer in the vegetation - like setting . a frame 42 is provided for bolting to the housing about the fixed inlet aperture 36 . the plastic liner 14 is positioned about the aperture 36 and is trapped and bolted in place using the frame 42 . referring now to fig3 , the construction 28 is shown with a fixed inlet aperture 36 and the frame 42 . a filter frame 44 is provided to rest on an interior ledge 45 ( see fig6 ) that is molded in the housing between the bottom wall 38 and the bottom edge of the fixed opening 36 . a filter mat 46 which is slightly shorter than the filter frame 44 rests on the frame . the mat is shorter than the frame at its front end . the filter frame defines a slot at its front end . it will be appreciated that in addition to components ( i . e ., ledge , filter frame and filter mat ) that define a horizontal position for the mat , those components can be modified or other components can be provided to permit the mat to be positioned vertically or at an angular position between the horizontal and vertical . the internal assembly 48 is shown in fig3 and is shown disassembled in fig4 . the faux cover 40 is shown and is fabricated of a foam material in the shape of faux stone so as to enhance the camouflaging of the skimmer construction in the vegetation setting . the internal assembly 48 is shown in exploded fashion in greater detail in fig4 . referring to fig4 , the internal assembly includes the following major components . the front face and basket assembly 52 , the adjustable or movable aperture plate 54 , the hinged weir plate 56 , the adjustment plate 58 and the adjustment or thumb screws 60 or 62 . the front surface and basket assembly includes a front face 64 or portion which has a back surface which defines an aperture 66 and a skimmer housing engaging lip 68 at the top thereof . a debris - receiving basket 70 integral with the front face is provided below the lip 68 , behind the front face 64 and surrounds the aperture 66 on three ( 3 ) sides . the adjustable aperture plate 54 defines a vertically adjustable or movable inlet aperture 72 which is smaller than each of the fixed aperture 36 and the aperture 66 . the plate 54 and the movable aperture 72 are positioned relative to the back surface of the front face 64 so as to be movable vertically the adjustment plate 58 has along each side edge , a stepped shoulder - like construction 76 or 78 . a pair of edges 80 and 82 are provided for engagement with the back surface of the front face 64 by a screw - like system . the plate also defines a large fixed aperture 86 and a plurality of vertically elongated adjustment slots 88 and 90 which are generally parallel to the edges 80 and 82 . a pair of adjustment holes 73 a and 73 b are provided on the back of the adjustable aperture plate 54 for engagement by the adjustment or thumb screws 60 and 62 . it is seen that the apertures or bosses 73 a and 73 b are open at the back end of the adjustable aperture plate , extend toward the front thereof and are closed at the front thereof . in the alternative , threaded sleeves or bosses can be positioned at the holes 73 a and 73 b to receive thumb screws 60 , 62 . the thumb screws 60 , 62 include a shank portion such as 60 a and a head portion such as 60 b . the shank portion fits through the slot such as 88 and engages an hole such as 73 a and the head engages the back of the adjustment plate so as to permit the aperture plate 54 to be moved relative to the adjustment plate 58 . when assembled , the weir plate 56 fits within the aperture 72 in the adjustable aperture plate and the adjustable aperture plate is held in position by the adjustment plate 58 which is secured ( i . e ., screwed ) to the front face along the edges 80 and 82 . the adjustable aperture plate 54 is vertically movable with respect to the front face 64 and the aperture 66 by virtue of loosening the screws 60 , 62 , moving the aperture plate 54 relative to the adjustment plate and resecuring the aperture plate by tightening the screws 60 and 62 . it is appreciated that the entire inlet assembly 48 is removably positioned in the skimmer as shown in fig5 and fig6 and relative to the inlet 36 by the skimmer lip construction 68 . in other words , the assembly 48 hangs by the lip 68 on the skimmer housing . this is best seen in fig5 . the inlet assembly 48 can also be removed by lifting the inlet assembly and disengaging the lip . referring now to fig6 , the skimmer construction 28 and internal inlet assembly 48 are seen and a horizontal pump 92 is shown resting on the skimmer bottom wall 38 . the pump outlet pipe 94 is shown exiting the pump , extending upwardly through the filter mat and out of the skimmer construction 28 . it will be appreciated that the pump outlet is connected to the skimmer pipe 32 . power is supplied to the pump 92 via line 93 . the foregoing structure describes a horizontal pump positioned on a bottom wall with a horizontal filter mat positioned horizontally above the pump . however , the skimmer can be appropriately modified and constructed for use with a vertical pump where the pump is vertically positioned . the filter mat is vertical and positioned between the incoming pond water and the pump so as to filter the incoming water before it is received by the pump . of course , angular orientations of the filter mat between the horizontal and vertical can be accommodated . in operation , pond water , indicated by arrows 96 , enters the skimmer from the pond . the water flows through the frame 42 , the fixed opening 36 , the movable or adjustable inlet aperture 72 against the weir plate 56 and the adjustment plate aperture 86 , into the debris basket 70 . at the debris basket , large floating debris such as twigs , leaves , etc ., are collected and the received pond water is filtered to some extent . the initially filtered water is indicated by arrows 98 and flows from the basket through the filter mat 46 . there the water 100 enters the horizontal pump and then exits via outlet 94 . referring now to fig7 , which is similar to fig6 , but viewed at a different angle . the same components as in fig6 are seen in fig7 . in addition there is shown the discharge assembly 102 . the discharge assembly includes a discharge port 104 in the sidewall of the skimmer housing 34 and a rotatable “ j ” shaped elbow 106 that is fitted to the aperture 104 and is rotatable between substantially horizontal and vertical positions . the aperture 104 is circular and positioned such that the bottom of the aperture 104 is about ¾ inch above the top of the fixed inlet aperture 36 . the purpose of the discharge is to permit draining of the skimmer construction and the pond in the event the water fills to an undesirably high level , such as the top edge of the housing 34 . thus , water above the top edge of the aperture 104 will flow into the discharge aperture and exit therefrom . in order to provide some control as to the water level , the rotatable or “ j ” shaped pipe 106 is provided . in the substantially horizontal position shown by the dotted lines , reference numeral 106 a , the pipe will receive water which is at or above the top of the inlet aperture . however , the elbow can be rotated to a substantially vertical position , as shown in solid line and by reference numeral 106 b . there entry to the elbow has been raised to a higher position and overflow water is permitted to rise above the top edge of the inlet aperture and exit via the discharge . as indicated above , the filter frame 44 includes a front slot defined by the peripheral frame member 44 a and the cross member 44 b . the frame thus defines a small slot - like opening between the front edge of the frame and the cross member 44 b . the slot is positioned to receive the bottom edge 108 of the front face . this stabilizes the entire internal assembly so as to hang by the lip from the housing 34 and be positioned against the front of the housing 34 and the aperture 36 . this is done by the bottom edge 108 fitting within the slot formed by 44 a and 44 b of the filter frame . turning now to fig8 , the skimmer construction 28 includes the skimmer housing 34 and internal assembly 48 . the internal assembly 48 is mounted to the skimmer housing 34 by the lip 68 . the housing fixed aperture 36 and the aperture plate or frame 42 are seen . the inlet assembly plate aperture 66 is shown and is approximately the same size as the frame 42 . the movable plate 54 is against the front face 64 . the movable plate defines the movable aperture 72 which is seen in a raised position in fig8 . the adjustment plate 58 engages the movable plate 54 and is secured to the rear of the front face 64 . the aperture for the adjustment plate 58 is shown with numeral 86 . it will be appreciated that the movable plate 54 and thus the aperture 72 can be moved up and down against the front surface and inside the skimmer construction . the bottom section 108 of the front surface 64 and basket 70 form a trough - like section that fits within the slot of the filter frame 44 and receives the movable plate 54 as it moves up and down . in the event a vertical pump and filter mat were used , the skimmer housing would be appropriately modified so as to maintain the functionality of the internal assembly . in fig8 , plate 54 is shown in a raised position near the top of the trough / bottom edge 108 . referring now to fig9 , the movable aperture 72 is shown in a lowered position . there the plate 54 extends down into the bottom section or trough 108 so as to effectively lower the aperture 72 . thus , it is appreciated that the aperture can be raised or lowered as needed and with respect to the water level of the pond itself so as to permit floating debris to enter the skimmer construction and be filtered by the basket 70 . referring now to fig1 and 11 , skimmer construction 28 is again shown along with the housing 34 . the assembly 48 is shown mounted to the skimmer housing 34 by the lip 68 . the controllable discharge 102 is shown in fig1 . there the discharge is shown as including the aperture or port 104 and the “ j ” shaped elbow 106 . the elbow 106 is in the upright or vertical position . it will be appreciated that the water level in the skimmer 28 and the pond cannot be higher than the top or inlet 106 a of the elbow . turning now to fig1 , the discharge assembly and particularly the discharge elbow 106 is shown as rotated from a vertical position , as in fig1 , to a horizontal position as in fig1 . thus , the water level in the skimmer basket and in the pond cannot be higher than the top of the inlet 106 a . thus , by rotating the elbow 106 between the vertical and horizontal position , the water level in the pond and in the skimmer can be controlled between the vertical position as shown in fig1 and a horizontal position as shown in fig1 . numerous changes and modifications can be made to the embodiments shown herein without departing from the spirit and scope of this invention .
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 .