Our Drywells are 72" ID with an assortment of risers and tops available. The Drywell base riser has an 8" thick x 98" dia. footer with a 48" dia. hole centered in it. The base riser is 38" high from the bottom to the joint. The Drywell riser sections are 36" high. The Drywell riser sections have 1" x 34" horizontal slots, 12 per riser. spaced 10" apart vertically. A flat top is provided or a transition slab can be added allowing 48" ID manhole risers, cones and/or flat tops to be used.
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