The ornamental design for a cell for watermanagementsystem, as shown and described.
FIG. 1 is a left-front perspective view of a cell for water management system showing the new design;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a right elevation view thereof;
FIG. 6 is a rear elevation view thereof; and,
FIG. 7 is a left elevation view thereof.
The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design while all other broken lines are directed to environment; broken lines form no part of the claimed design. The precise length between the breaklines in the drawings is not being claimed.