a base including a length, a width, a collection area, a first edge, and a second edge

a first panel including a wall side, an exposed side, a first height, a first panel attaching side, a first base end, and a first partial channel, the first base end shaped to engage the first edge of the base, the first panel attaching side including a first interlocking member;

a second panel including a wall side, an exposed side, a second height approximately equal the first height, a second panel attaching side, a second base end, and a second partial channel, the second base end shaped to engage the second edge of the base, the second panel attaching side including a second interlocking member shaped to accept the first interlocking member and secure the first panel attaching side to the second panel attaching side; and

wherein when the first panel is attached to the second panel the first partial channel and the second partial channel form a channel extending substantially the first height and the second height, the channel shaped to direct water down toward the base and away from the one or more walls, the channel including a cross-sectional area that varies, with the cross-sectional narrowing as the channel approaches the base, and

wherein the first panel further includes at least one first baffling section positioned proximate the first partial channel and the second panel further includes at least one second baffling section positioned proximate the second partial channel, the first baffling section and the second baffling section forming a baffling area when the first panel is attached to the second panel, the baffling area positioned closer to the exposed sides of the first and second panels than the channel is to the exposed sides of the first and second panels.