The ornamental design for a portable waterpump, as shown and described.
FIG. 1 is a right side elevational view of a portable water pump showing my
new design, the left side being a mirror image;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a front, rear and right side perspective view thereof, the cable
element being shown broken-away in the views to indicate indeterminate
length.