Water storage chamber connection system

1. A water detention system, comprising:

a first plastic arch-shaped corrugated chamber having corrugations distributed along a length of the chamber extending transverse to a longitudinal 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, the chamber length defined by a first end and a second end; and

a first flange provided at the base of each lower end of each side portion of said first plastic arch-shaped corrugated chamber, said first flange extending substantially perpendicular to the lower end of each side portion and having a first upper surface and a first lower surface;

wherein the first lower surface of at least one of said first flanges at the first end includes a first protrusion formed as an elongated member;

wherein the first upper surface of at least one of said first flanges at the second end includes a first aperture or cavity formed therein as an elongated slot; and

a second plastic arch-shaped corrugated chamber having corrugations distributed along a length of the chamber extending transverse to a longitudinal 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, the chamber length defined by a first end and a second end; and

a second flange provided at the base of each lower end of each side portion of said second plastic arch-shaped corrugated chamber, said second flange extending substantially perpendicular to the lower end of each side portion and having a second upper surface and a second lower surface;

wherein the second lower surface of at least one of said second flanges the first end includes a second protrusion formed as an elongated member;

wherein the second upper surface of at least one of said second flanges at the second end includes a second aperture or cavity formed therein as an elongated slot; and

wherein the first and second chambers are affixed to each other in an end-to-end fashion, a first upstanding end corrugation of the first chamber fitted over top of a second upstanding end corrugation of the second chamber such that the second upstanding end corrugation is nested within the first upstanding end corrugation, wherein said first protrusion is fitted into and engages with said second aperture or cavity such that the two side portions of the first plastic arch-shaped corrugated chamber are prevented from moving laterally away from the two side portions of the second plastic arch-shaped corrugated chamber.

2. The system of claim 1 , wherein the elongated member and the elongated slot extend parallel to the longitudinal axis of each respective chamber.

3. The system of claim 2 , wherein said at least one of said first flanges is provided with an undercut on the lower surface with said first protrusion positioned on said undercut.

4. The system of claim 1 , wherein the first protrusion comprises two first protrusions and the second protrusion comprises two second protrusions, the two first protrusions positioned on the lower surfaces of the first flanges and the two second protrusions positioned on the lower surfaces of the second flanges, and the first aperture or cavity comprises two first apertures or cavities and the second aperture or cavity comprises two second apertures or cavities, the two first apertures or cavities positioned on the upper surfaces of said two first flanges and the two second apertures or cavities positioned on the upper surfaces of said second flanges.

5. The system of claim 4 , wherein the two first elongated members and the two first elongated slots extend parallel to the longitudinal axis of said first chamber.

6. The system of claim 5 , wherein one of said first two elongated members is angled relative to a longitudinal length of its respective flange and one of said first elongated slots is angled relative to a longitudinal length of its respective flange and is adapted to receive an angled elongated member.

7. The system of claim 1 , wherein said first protrusion is sized to friction fit within said second aperture or cavity.

8. The system of claim 1 , wherein said first protrusion has an undercut and is adapted to be inserted into said second aperture or cavity whereby the first protrusion is locked into the second aperture or cavity.

9. The system of claim 1 , wherein the second end corrugation of the second chamber is smaller than the first end corrugation of the first chamber.

10. The system of claim 1 , further comprising first stacking lugs extending between said at least some of the corrugations and said respective flange of said first plastic arch-shaped corrugated chamber.

11. The system of claim 10 , wherein said stacking lugs form an upper edge that extends substantially perpendicular to the longitudinal axis of said first plastic arch-shaped corrugated chamber.

12. The system of claim 11 , wherein said upper edge comprises a first surface in a plane a first distance (d 1 ) from the upper surface of said first flange and a second surface in a plane a second distance (d 2 ) from the upper surface of said first flange.

13. The system of claim 12 , wherein the second distance (d 2 ) is larger than the first distance (d 1 ).

14. The system of claim 1 , wherein said first plastic arch-shaped corrugated chamber is formed of a cellular plastic foam.

15. A water detention chamber, comprising:

a plastic arch-shaped corrugated chamber having corrugations distributed along a length of the chamber extending transverse to a longitudinal 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, the chamber length defined by a first end and a second end;

said first end comprising a upstanding starting corrugation and said second end comprising an upstanding end corrugation, wherein the starting corrugation is designed to mate with and nest within an end corrugation on an identical second water detention chamber such that the water detention chamber and the second water detention chamber are non-rotatable relative to each other when connected in an end-to-end fashion; and

a flange provided at the base of each lower end of each side portion, said flanges extending substantially perpendicular to the lower end of each side portion and having an upper surface and a lower surface;

wherein the flanges are provided with one or more protrusions extending downwardly from the lower surface of said flange at the first end;

wherein the flanges are provided with one or more apertures or cavities having an opening at the second end, whereby the one or more protrusions extend in a direction opposite from an orientation of the opening of the one or more apertures or cavities;

wherein said one or more protrusions on said chamber are adapted to fit into and engage with one or more mating apertures or cavities on an identical second chamber such that the two side portions of the chamber are prevented from moving laterally away from two side portions of the second chamber.

16. The chamber of claim 15 , wherein said one or more protrusions comprise one or more elongated members and said one or more apertures or cavities comprise one or more elongated slots.

17. The chamber of claim 16 , wherein the one or more elongated members and the one or more elongated slots extend in parallel with the longitudinal axis of said chamber.

18. The chamber of claim 15 , wherein the one or more protrusions are provided with an undercut.

19. A water detention system, comprising:

a first plastic arch-shaped corrugated chamber having corrugations distributed along a length of the chamber extending transverse to a longitudinal 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, the chamber length defined by a first end and a second end; and

a first flange provided at the base of each lower end of each side portion of said first plastic arch-shaped corrugated chamber, said first flange extending substantially perpendicular to the lower end of each side portion and having a first upper surface and a first lower surface;

wherein the first lower surface of at least one of said first flanges at the first end includes a first protrusion formed as an elongated member;

wherein the first upper surface of at least one of said first flanges at the second end includes a first aperture or cavity formed therein as an elongated slot; and

a second plastic arch-shaped corrugated chamber having corrugations distributed along a length of the chamber extending transverse to a longitudinal 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, the chamber length defined by a first end and a second end; and

a second flange provided at the base of each lower end of each side portion of said second plastic arch-shaped corrugated chamber, said second flange extending substantially perpendicular to the lower end of each side portion and having a second upper surface and a second lower surface;

wherein the second lower surface of at least one of said second flanges at the first end includes a second protrusion formed as an elongated member;

wherein the second upper surface of at least one of said second flanges at the second end includes a second aperture or cavity formed therein formed as an elongated slot; and

wherein the first and second chambers are affixed to each other in an end-to-end fashion, a first end corrugation of the first chamber fitted over top of a second end corrugation of the second chamber such that the second end corrugation is nested within the first end corrugation, wherein said first protrusion is fitted into and engages with said second aperture or cavity such that the two side portions of the first plastic arch-shaped corrugated chamber are prevented from moving laterally away from the two side portions of the second plastic arch-shaped corrugated chamber;

wherein the first protrusion comprises two first protrusions and the second protrusion comprises two second protrusions, the two first protrusions positioned on the lower surfaces of the first flanges and the two second protrusions positioned on the lower surfaces of the second flanges, and the first aperture or cavity comprises two first apertures or cavities and the second aperture or cavity comprises two second apertures or cavities, the two first apertures or cavities positioned on the upper surfaces of said first flanges and the two second apertures or cavities positioned on the upper surfaces of said second flanges;

wherein the two first elongated members and the two first elongated slots extend parallel to the longitudinal axis of said first chamber;

wherein one of said first two elongated members is angled relative to a longitudinal length of its respective flange and one of said first elongated slots is angled relative to a longitudinal length of its respective flange and is adapted to receive an angled elongated member.