1. A drywell apparatus for collecting and diverting runoff surface water or waste water, and controlling the flow and direction of subsurface water, comprising:a top having a large diameter, central, top port, opening into a drywell apparatus interior, said top port adapted to receive surface water;
an open bottom;
a cylindrical sidewall interconnecting the drywell top and bottom, said drywell top, bottom and sidewall defining the drywell apparatus interior, said sidewall having an exterior surface and an interior surface, said sidewall having a plurality of rectangular drain-type ports distributed about the sidewall;
a plurality of interior diverters attached to the sidewall interior, within the drywell interior, each interior diverter positioned about one of the plurality of drain-type ports, each interior diverter having a front, rear, open top, bottom, and two opposite, identical sides, said interior diverter front, rear, top, bottom and sides defining a hollow interior diverter interior, wherein the interior diverter rear is divided into two sections, a top section and a lower section, wherein said interior diverter rear top section is flat and extends vertically downward to a horizontal line, wherein the interior diverter rear lower section extends downward from the horizontal line and forward to a beginning of the interior diverter bottom, wherein a plurality of downwardly extending flanges are formed at a junction of the interior diverter rear lower section and the interior diverter bottom, wherein the interior diverter front has a plurality of holding tabs adjacent the interior diverter top and extending from the interior diverter sides toward each other, wherein the remainder of the interior diverter front is open;
wherein the interior diverter front engages one of the plurality of drain-type ports and the interior diverter bottom is seated on a drain-type port horizontal bottom, wherein the interior diverter downwardly extending flanges engage the side wall interior beneath one of the plurality of drain-type ports, wherein the interior diverter holding tabs are attached to the side wall interior above a one of the plurality of drain-type ports;
wherein water from the drywell apparatus interior enters the interior diverter top through the diverter interior, out through the diverter front, through one of the plurality of drywell drain-type ports, laterally dispersing into the surrounding soil, beginning at the top of a drywell, said interior diverter rear and sides preventing backfill soil from intruding into a drywell interior.