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, <br /> Rain Garden Design (Revised 8/28/2017): <br /> Bottom Length: 28-ft <br /> Bottom Width: 1-ft <br /> Side Slope: 3H:1V <br /> Ponding Depth: 12" <br /> Freeboard: 6" <br /> Underdrain: 6"perforated PVC pipe <br /> Riser: Type 1-L CB with beehive grate, floatable material separator, and gas trap <br /> Top Rain Garden Elevation = 109.5' <br /> Riser Elevation = 109.0' <br /> Bottom Surface Elevation = 108.0' <br /> Underdrain Invert Elevation = 105.0' <br /> Grandview Apartments Clubhouse 8/28/2017 <br />