Ground surface drainage apparatus

Claim 1

A ground surface drainage apparatus comprising: a catch basin of hollow cylindrical tubular cross section having a catch basin interior diameter and having an upwardly directed axis, said catch basin having a closed bottom, and an open top defined by a circular rim; a drain port in the side of said catch basin above its closed bottom and below its open top; a stop collar in the interior of said catch basin forming an interiorly directed ledge defining the stop collar diameter, said stop collar being positioned intermediate said drain port and said open end of said catch basin, the distance between said ledge and said rim in a direction parallel to said axis being a first dimension; a downwardly directed hollow cylindrical extension tube having an outer diameter at least as small as said catch basin interior diameter and larger than said stop collar diameter positioned interiorly of said tubular catch basin and engaged against said ledge of said interiorly directed stop collar, said extension tube having an axis substantially on said catch basin axis, said extension tube engaging said catch basin so as to be substantially water-tight with respect thereto, said upwardly directed extension tube being of selectable length so as to extend upwards substantially to finished ground level, the interior diameter of said extension tube being substantially equal to the stop collar diameter; and a grate secured directly to said upwardly directed extension tube and positionable substantially at ground level, said grate having an annular flange with a plurality of openings therethrough and having a depending tube portion extending downwardly from said flange a second dimension, said downwardly depending tube portion having a diameter less than said stop collar diameter and extending interiorly of said extension tube, said second dimension being greater than said first dimension so that said tube portion on said grate is sufficiently long that said tube portion on said grate can extend through said stop collar when said upwardly directed extension tube is sufficiently short, said catch basin, said upwardly directed extension tube and said grate being made of synthetic polymer composition material, so that water can flow from the ground downwardly through said grate and through said extension tube and into said catch basin so that it can be discharged from said catch basin through said drain port.