Patent ID: 6968854

Claim:
A manhole base or liner for directing the flow of liquid from a manhole inlet opening positioned in one of a plurality of possible locations in a manhole side wall to a manhole outlet opening in the manhole side wall, the base or liner comprising: (a) a perimeter; (b) an upper surface extending to the perimeter; and (c) a liquid flow path formed in the upper surface and having, in series, first and second flow path portions, the first flow path portion defined by a first bottom wall and a pair of spaced apart side by side guide walls extending upwardly from the bottom wall, the guide walls each having a guide wall inner end and a guide wall outer end, the outer ends being located at the perimeter and being spaced apart a greater distance than the distance between the inner ends, the second flow path portion being defined by a second bottom wall, contiguous with the first bottom wall, and a pair of spaced apart side by side channel walls extending upwardly from the second bottom wall, each channel wall having an inner channel wall end and an outer channel wall end, the inner channel wall ends meeting the respective guide wall inner ends, and the outer channel wall ends being located at the perimeter.