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1. A grit removal system comprising: a grit removal chamber having an annular wall encircling a bottom; a central hopper beneath said chamber bottom, said chamber bottom having a central opening therethrough to said hopper; an influent channel directing wastewater with grit into said grit removal chamber through an influent chamber wall opening; an effluent channel directing wastewater out of said grit removal chamber through an effluent chamber wall opening; first and second plate portions which together comprise a plate over said chamber bottom central opening, wherein said first plate portion is formed on one side of a radial line of the plate, the first plate portion has a plurality of first openings therethrough and said second plate portion is formed on the other side of the radial line of the plate, the second plate portion has a plurality of second openings there through, wherein said first openings have at least one of size, shape and number which are different than the size, shape or number of said second openings, wherein the flow velocity for a given flow rate through said first openings is greater than the flow velocity for said given flow rate through said second openings.
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