Abstract: A subsurface fluid conveyance chamber is arch-shaped in cross-section, having a corrugated outer shell extending along a horizontal axis with a pair of contiguously molded end walls and alternating peak and valley corrugations along its length. Each peak corrugation forms an outer ridge having a top surface and a pair of sidewalls. Inner walls along each lateral side of the outer shell form interior chambers at each ridge location in the outer shell. Each interior chamber has an aperture formed in the inner wall, and two opposing apertures formed in each sidewall. The inner wall apertures are vertically offset above the outer shell apertures and form a gravity trap for the granular material, limiting entry to the lower section of the interior chambers. The angled pathways defined by the interior chamber aperture locations require directional changes in fluid flow that minimize contamination of the inner conveyance chamber during use.

Abstract: A leaching chamber having an arch-shaped cross-section, a pair of contiguously molded, opposing end walls, and alternating peak and valley corrugations along its length, is provided interior chambers and fluid communication openings along the base on each extending side of the chamber. Formed within the chamber at locations corresponding to each peak corrugation, an inner wall is attached to an interior surface and extends substantially within the peak corrugation to the base of the chamber. An aperture is formed in both the inner wall and in the opposing outer wall of the chamber, enabling fluid communication through the interior chamber—and thus into and out from the interior of the leaching chamber itself.

Abstract: A leaching chamber having an arch-shaped cross-section, a pair of contiguously molded, opposing end walls, and alternating peak and valley corrugations along its length, is provided interior chambers and fluid communication openings along the base on each extending side of the chamber. Formed within the chamber at locations corresponding to each peak corrugation, an inner wall is attached to an interior surface and extends substantially within the peak corrugation to the base of the chamber. An aperture is formed in both the inner wall and in the opposing outer wall of the chamber, enabling fluid communication through the interior chamber—and thus into and out from the interior of the leaching chamber itself.

Abstract: A subsurface fluid distribution system for sewage effluent and irrigation water utilizes one or more arrays of serially connected leaching chambers. Each leaching chamber is a double-walled construction of arch-shaped cross section with an open bottom and closed ends. A plurality of vertically off-set openings are formed in the inner and outer walls, with the inner openings located at a higher liquid level than the outer openings to prevent clogging of the leaching chambers by either sand or root growth. The leaching chambers are connected to one another to permit fluid communication between adjacent chambers, and are installed below ground in shallow trenches that are backfilled with sand and then topped with top soil. The sewage effluent or irrigation water flows through the array of leaching chambers in an unpressurized flow.