Low-profile fluid conduit/collector and system

1. A low-profile subsurface fluid conveyance conduit grid, comprising:

at least one high-volume, low-profile fluid trunk conduit;

at least two medium-volume, low-profile fluid branch conduits connected to and feeding into the at least one high-volume, low profile trunk conduit; and

at least four lower-volume, low-profile collector conduits connected to and feeding into the at least two medium-volume, low profile branch conduits, with each branch conduit being connected to at least two of the collector conduits, wherein surficial fluid can be drawn into the smaller collector conduits, gathered into the somewhat larger branch conduits, and finally into the trunk conduit,

and wherein at least one of the trunk conduit, the branch conduits, and the collector conduits comprise an elongate outer cover having an upper portion and a lower portion generally opposite the upper portion, with the outer cover being much wider than it is tall and defining an interior volume and including an elongate rigid spacer fitted within the interior volume of the elongate outer cover, the elongate spacer allowing the majority of the interior volume to be unfilled so as to permit the flow of fluid along and within the elongate outer cover; wherein the fluid comprises surficial landfill gas, and wherein the grid is substantially cruciform in shape and at intersections of various conduits an adapter T or cross is provided, and wherein the adapter T or cross has an upper opening and is provided with a cover for covering the upper opening.

2. A low-profile subsurface fluid conveyance conduit grid as claimed in claim 1 wherein the elongate outer cover is non-perforated.

3. A low-profile subsurface fluid conveyance conduit grid as claimed in claim 1 wherein the elongate outer cover is perforated.

4. A low-profile subsurface fluid conveyance conduit grid as claimed in claim 1 wherein the elongate outer cover is much thinner than it is tall and is flexible.

5. A low-profile subsurface fluid conveyance conduit grid as claimed in claim 1 wherein the fluid includes at least some water.

6. A low-profile subsurface fluid conveyance conduit grid as claimed in claim 1 wherein the grid is adapted for use under the surface of a landfill, the grid further comprising an impermeable membrane positioned under the surface of the landfill and over the conduits.

7. A low-profile subsurface fluid conveyance conduit grid as claimed in claim 1 wherein the at least one trunk conduit and the at least two branch conduits each comprise an elongate, non-perforated outer cover.

8. A low-profile subsurface fluid conveyance conduit grid as claimed in claim 1 wherein the at least four collector conduits each comprise an elongate perforated outer cover.

9. A low-profile subsurface fluid conveyance conduit grid as claimed in claim 7 wherein the elongate outer cover comprises a polymer.

10. A low-profile subsurface fluid conveyance conduit grid as claimed in claim 8 wherein the elongate outer cover comprises a polymer.

11. A low-profile subsurface fluid conveyance conduit grid as claimed in claim 1 wherein the collector conduits have an aspect ratio of width to height of more than 10:1.

12. A low-profile subsurface fluid conveyance conduit grid as claimed in claim 1 wherein the collector conduits have an aspect ratio of width to height of more than 20:1.

13. A low-profile subsurface fluid conveyance conduit grid as claimed in claim 1 wherein the collector conduits have an aspect ratio of width to height of more than 50:1.

14. A low-profile subsurface fluid conveyance conduit grid as claimed in claim 1 wherein the collector conduits have a height of between about ½ inch and about 3 inches.

15. A low-profile subsurface fluid conveyance conduit grid as claimed in claim 1 wherein the collector conduits have a height of about one inch.