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A storm water and septic system using plastic galleries that have multiple layers provided having differing hardness characteristics, the exterior layer having a lower hardness rating than an inner layer; and a multi-layer gallery where the inner layer is treated to be resistance to degradation to a

A storm water and septic system using plastic galleries that have multiple layers provided having differing hardness characteristics, the exterior layer having a lower hardness rating than an inner layer; and a multi-layer gallery where the inner layer is treated to be resistance to degradation to a selected chemical that would otherwise degrade polyethylene. The gallery may further be provided with an interior layer having defined dielectric properties such that a fluid level measurement can be made of fluid in the galleries.

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What is claimed is: 1. A multi-layer gallery having an elongated arched body and first and second ends, the elongated arched body forming an elongated arched interior space with an open bottom for liquid to flow therethrough, the multi-layer gallery comprising: a first exterior layer having a hardn

What is claimed is: 1. A multi-layer gallery having an elongated arched body and first and second ends, the elongated arched body forming an elongated arched interior space with an open bottom for liquid to flow therethrough, the multi-layer gallery comprising: a first exterior layer having a hardness (H1) that extends the substantially the length of the gallery; a second inner layer forming a plurality of spaced apart upstanding ribs along a length of the gallery, said second layer having a hardness (H2); said hardness (H1) of said first exterior layer being lower than the hardness (H2) of said second inner layer; and a connecting mechanism located at the first and second end of the multi-layer gallery for connecting the gallery together with another gallery in an end-to-end relationship, the connecting mechanism comprising a starting rib located at the first end of the gallery, and an end rib located at the second end of the gallery, such that a first gallery and a second gallery may be connected together by overlapping a starting rib of the first gallery over an end rib of the second gallery. 2. The multi-layer gallery of claim 1 wherein said starting rib is larger than the end rib. 3. The multi-layer gallery of claim 1 further comprising an end wall located at the second end of the gallery. 4. The multi-layer gallery of claim 3 wherein said end wall is integral to the gallery. 5. The multi-layer gallery of claim 3 wherein said end wall is detachably connectable to the second end of the gallery. 6. The multi-layer gallery of claim 1 wherein said first exterior layer is formed as a smooth exterior layer overlaying said second inner layer. 7. The multi-layer gallery of claim 1 wherein a top portion of the arched body is provided having a white color. 8. The multi-layer gallery of claim 1 further comprising a metallic portion positioned on the elongated arched body such that the body may be detected when buried. 9. A multi-layer polyethylene gallery having an elongated arched body and first and second ends, the elongated arched body forming an elongated arched interior space with an open bottom for liquid to flow therethrough, the multi-layer gallery comprising: a first exterior layer forming a plurality of spaced apart upstanding ribs along a length of the gallery; a second inner layer extending substantially the length of the gallery; said second inner layer treated to resist degradation by a selected substance that is caustic to polyethylene such that the multi-layer polyethylene gallery can be used to disperse substances that may be harmful to polyethylene without degradation to the gallery; and a connecting mechanism located at the first and second end of the multi-layer gallery for connecting the gallery together with another gallery in an end-to-end relationship, the connecting mechanism comprising a starting rib located at the first end of the gallery, and an end rib located at the second end of the gallery, such that a first gallery and a second gallery may be connected together by overlapping a starting rib of the first gallery over an end rib of the second gallery. 10. The multi-layer gallery of claim 9 wherein said starting rib is larger than the end rib. 11. The multi-layer gallery of claim 10 further comprising an end wall located at the second end of the gallery. 12. The multi-layer gallery of claim 11 wherein said end wall is integral to the gallery. 13. The multi-layer gallery of claim 11 wherein said end wall is detachably connectable to the second end of the gallery. 14. The multi-layer gallery of claim 9 wherein said second inner layer is formed as a smooth inner layer overlaying an inner surface of said first exterior layer. 15. The multi-layer gallery of claim 9 wherein a top portion of the arched body is provided having a white color. 16. The multi-layer gallery of claim 9 further comprising a metallic portion positioned on the elongated arched body such that the body may be detected when buried. 17. A multi-layer gallery having an elongated arched body and first and second ends, the elongated arched body forming an elongated arched interior space with an open bottom for liquid to flow therethrough, the multi-layer gallery comprising: a first exterior polyethylene layer forming a plurality of spaced apart upstanding ribs along a length of the gallery; a second inner polyethylene layer having a know Dielectric Constant (DC) at a given temperature; a DC conductivity measurement of the second inner polyethylene layer that is indicative of a level of liquid in the gallery at a given point in time; a level signal generator receiving the DC conductivity measurement and generating a level signal corresponding to the level of liquid in the gallery; and a connecting mechanism located at the first and second end of the multi-layer gallery for connecting the gallery together with another gallery in an end-to-end relationship, the connecting mechanism comprising a starting rib located at the first end of the gallery, and an end rib located at the second end of the gallery, such that a first gallery and a second gallery may be connected together by overlapping a starting rib of the first gallery over an end rib of the second gallery. 18. The multi-layer gallery of claim 17 wherein said level signal generator is coupled to a computer and said level signal is transmitted to said computer. 19. The multi-layer gallery of claim 18 wherein said computer is coupled to a network. 20. The multi-layer gallery of claim 17 wherein said starting rib is larger than the end rib. 21. The multi-layer gallery of claim 17 further comprising an end wall located at the second end of the gallery. 22. The multi-layer gallery of claim 21 wherein said end wall is integral to the gallery. 23. The multi-layer gallery of claim 21 wherein said end wall is detachably connectable to the second end of the gallery. 24. The multi-layer gallery of claim 17 wherein a top portion of the arched body is provided having a white color. 25. The multi-layer gallery of claim 17 further comprising a metallic portion positioned on the elongated arched body such that the body may be detected when buried. 26. A multi-layer gallery having an elongated arched body and first and second ends, the elongated arched body forming an elongated arched interior space with an open bottom for liquid to flow therethrough, the multi-layer gallery comprising: a first exterior layer having a hardness (H1) that extends the substantially the length of the gallery; a second inner layer forming a plurality of spaced apart upstanding ribs along a length of the gallery, said second layer having a hardness (H2); said hardness (H1) of said first exterior layer being lower than the hardness (H2) of said second inner layer; a third interior layer extending substantially the length of the gallery; said third interior layer treated to resist degradation by a selected substance that is caustic to polyethylene such that the multi-layer polyethylene gallery can be used to disperse substances that may be harmful to polyethylene without degradation to the gallery; and a connecting mechanism located at the first and second end of the multi-layer gallery for connecting the gallery together with another gallery in an end-to-end relationship, the connecting mechanism comprising a starting rib located at the first end of the gallery, and an end rib located at the second end of the gallery, such that a first gallery and a second gallery may be connected together by overlapping a starting rib of the first gallery over an end rib of the second gallery. 27. A multi-layer gallery having an elongated arched body and first and second ends, the elongated arched body forming an elongated arched interior space with an open bottom for liquid to flow therethrough, the multi-layer gallery comprising: a first exterior layer having a hardness (H1) that extends the substantially the length of the gallery; a second inner layer forming a plurality of spaced apart upstanding ribs along a length of the gallery, said second layer having a hardness (H2); said hardness (H1) of said first exterior layer being lower than the hardness (H2) of said second inner layer; a third interior polyethylene layer having a know Dielectric Constant (DC) at a given temperature; a DC conductivity measurement of the third interior polyethylene layer that is indicative of a level of liquid in the gallery at a given point in time; a level signal generator receiving the DC conductivity measurement and generating a level signal corresponding to the level of liquid in the gallery; and a connecting mechanism located at the first and second end of the multi-layer gallery for connecting the gallery together with another gallery in an end-to-end relationship, the connecting mechanism comprising a starting rib located at the first end of the gallery, and an end rib located at the second end of the gallery, such that a first gallery and a second gallery may be connected together by overlapping a starting rib of the first gallery over an end rib of the second gallery.