The ornamental design for a rainchainwaterfeature, as shown and described.
FIG. 1 is a perspective view of the rain chain water feature;
FIG. 2 is a front elevational view of the rain chain water feature;
FIG. 3 is a side elevational view of the rain chain water feature;
FIG. 4 is a top view of the rain chain water feature;
FIG. 5 is a bottom view of the rain chain water feature;
FIG. 6 is a side cross-sectional view of the rain chain water feature taken along line 6-6 of FIG. 3;
FIG. 7 is an exploded and cutaway perspective view of the rain chain water feature; and,
FIG. 8 is a perspective view of the rain chain water feature, interconnected to multiple components in a vertical chain in phantom, the additional components shown in phantom show environmental subject matter only that form no part of the claim.