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The ornamental design for an irrigation water drainage unit, as shown. |
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FIG. 1 is a perspective view of the irrigation water drainage unit showing my new design, with phantom lines showing how it is connected to a conduit;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is an elevational view of the front thereof;
FIG. 5 is an elevational view of the back thereof;
FIG. 6 is a left side elevational view thereof; and,
FIG. 7 is a right side elevational view thereof.
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