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An arch-shaped corrugated chamber having corrugation peaks and valleys, with reinforcing ribs provided on the corrugation peaks. The ribs extend upwardly from a chamber base to a rib upper end, and have an arch-shaped cross-section with an outer surface extending outwardly from a corrugation peak an

An arch-shaped corrugated chamber having corrugation peaks and valleys, with reinforcing ribs provided on the corrugation peaks. The ribs extend upwardly from a chamber base to a rib upper end, and have an arch-shaped cross-section with an outer surface extending outwardly from a corrugation peak and a fin extending inwardly from the corrugation peak, and optionally, a rib line provided on the rib outer surface on the rib arch-shaped cross-section. A channel formed by the inner surface of the rib is sized to receive a corresponding rib of a second chamber so that multiple similar chambers with ribs may be stacked together.

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1. A chamber, comprising: a cellular plastic foam arch-shaped corrugated chamber having a plurality of corrugation peaks and a plurality of corrugation valleys distributed along a length of the chamber, the corrugation peaks and corrugation valleys extending transverse to a lengthwise axis of the ch

1. A chamber, comprising: a cellular plastic foam arch-shaped corrugated chamber having a plurality of corrugation peaks and a plurality of corrugation valleys distributed along a length of the chamber, the corrugation peaks and corrugation valleys extending transverse to a lengthwise axis of the chamber, the chamber having a top portion and two side portions, with a base at a lower end of each side portion;a rib provided on a plurality of the plurality of corrugation peaks, each rib having an outer surface extending outwardly from a corrugation peak and a fin extending inwardly, wherein each rib has an outwardly extending arch-shaped cross-section with the fin extending inwardly from the rib arch-shaped cross-section, the rib arch-shaped cross-section having a depth and the fin having a depth, and wherein the fin depth is less than the depth of the rib arch-shaped cross-section, and wherein each rib extends upwardly from one of the bases to a rib upper end, and the rib arch-shaped cross-section decreases in size from the one of the bases to the rib upper end;the rib having a depth, the rib depth and the fin depth tapering from a greater depth adjacent to the one of the bases to a lesser depth above the one of the bases; andwhereby the rib and the fins define a channel sized to receive a corresponding rib of a second chamber, the channel having a depth varying from a maximum depth adjacent the one of the bases to a minimum depth adjacent a location above the one of the bases. 2. The chamber of claim 1, wherein a rib line is provided on the rib outer surface on the rib arch-shaped cross-section. 3. The chamber of claim 2, where the rib line is an outwardly extending solid rib. 4. The chamber of claim 2, where the rib line is an outwardly extending fin. 5. The chamber of claim 1, wherein the rib has a vertical height which is 30% to 80% of a vertical height of the chamber. 6. The chamber of claim 5, wherein the rib vertical height is 40% to 60% of the vertical height of the chamber. 7. The chamber of claim 1, wherein the channel minimum depth is located at the rib upper end. 8. A chamber, comprising: a cellular plastic foam arch-shaped corrugated chamber having a plurality of corrugation peaks and a plurality of corrugation valleys distributed along a length of the chamber, the corrugation peaks and valleys having a thickness, the corrugation peaks and corrugation valleys extending transverse to a lengthwise axis of the chamber, the chamber having a top portion and two side portions, with a base at a lower end of each side portion;a rib provided on a plurality of the plurality of corrugation peaks, each rib having an arch-shaped cross-section extending outwardly from a corrugation peak and having an outer wall, each rib further having a fin extending inwardly from the rib arch-shaped cross-section and a rib line on a rib outer surface on the rib arch-shaped cross-section;each rib extending upwardly from one of the bases to a rib upper end;the rib arch-shaped cross-section having a wall thickness and a depth, and the fin having a depth;the fin depth being greater than the arch-shaped cross-section wall thickness at a location adjacent to the one of the bases and less than the rib arch-shaped cross-section depth;the rib arch-shaped cross-section depth and the fin depth tapering from a greater depth adjacent to the one of the bases to a lesser depth above the one of the bases; andwhereby the rib arch-shaped cross-section and the fin define a channel sized to receive a corresponding rib of a second chamber, the channel having a depth varying from a maximum depth adjacent the one of the bases to a minimum depth adjacent a location above the one of the bases. 9. The chamber of claim 8, where the rib line is an outwardly extending solid rib. 10. The chamber of claim 8, where the rib line is an outwardly extending fin. 11. The chamber of claim 8, wherein the rib line is centered on the rib arch-shaped cross-section. 12. A chamber, comprising: a plastic arch-shaped corrugated chamber having a plurality of corrugation peaks and a plurality of corrugation valleys distributed along a length of the chamber, the corrugation peaks and corrugation valleys extending transverse to a lengthwise axis of the chamber, the chamber having a top portion and two side portions, with a base at a lower end of each side portion;a rib provided on a plurality of the plurality of corrugation peaks, the rib having an outwardly extending arch-shaped cross-section and a fin extending inwardly from the arch-shaped cross-section; andthe inwardly extending fin having a depth, the fin depth tapering from a greater depth adjacent to one of the bases to a lesser depth above the one of the bases. 13. The chamber of claim 12, wherein the fin has a vertical height which is 30% to 80% of a vertical height of the chamber. 14. The chamber of claim 13, wherein the fin vertical height is 40% to 60% of the vertical height of the chamber. 15. The chamber of claim 12, wherein the fin decreases in size from one of the bases to an upper end of the fin. 16. The chamber according to claim 12, wherein said chamber is formed of a cellular plastic foam. 17. A stormwater chamber, comprising: an elongated body with a top portion, a first side portion, and a second side portion and a generally arch-shaped cross-section;a base at a bottom of each of the first and second side portions;a plurality of circumferential reinforcing members disposed along a lengthwise axis of said elongated body; anda rib provided on a plurality of the circumferential reinforcing members, the rib having an outwardly extending arch-shaped cross-section and a fin extending inwardly from the arch-shaped cross-section, the fin extending upwardly from one of the bases to an upper end, the fin decreasing in depth from the one of the bases to its upper end. 18. The stormwater chamber of claim 17, wherein the fin has a vertical height which is 30% to 80% of a vertical height of the chamber. 19. The stormwater chamber of claim 18, wherein the fin vertical height is 40% to 60% of the vertical height of the chamber. 20. The stormwater chamber of claim 17, the fin's depth tapering from a greater depth adjacent to the one of the bases to a lesser depth above the one of the bases. 21. The chamber according to claim 17, wherein said stormwater chamber is formed of a cellular plastic foam.