Understand that vehicular traffic atop drywell lid should be avoided and is not warranted by manufacturer. When a leaching pit is placed where vehicles may occasionally pass near, you should always consult a local soil engineer. Rock fill, poorly percolating soil, ground water and/or saturation of perimeter with runoff may dictate an advanced engineering approach we can not supply you with. The minimal approach taken by engineers is to require a reinforced concrete base/pad under the drywell bottom panel and a 4 inch diameter Sch40 riser pipe from base to bottom of lid (vertical loading as per image above). In worst case scenarios, you might see engineeers add a reinforced concrete pad atop too. When stacking drywells, order the set of three side panels and assemble with the full kit of three panels and lid. Stabilize the stacked drywells with several half inch screws at each level and then lower the entire stack into the hole at one time. Backfill evenly to avoid tipping the stacked drywells.
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