Fluid retaining structure

1. A fluid retaining structure having an electronic leak detection and location (ELDL) system, the fluid retaining structure comprising:

electrically non-conductive inner and outer liners adapted to form electrical isolation layers for the ELDL system; and

an electrically conductive signal layer located between the inner and outer liners;

wherein

the inner and outer liners create an environment, within an interstitial space between the inner and outer liners, that is (a) electrically isolated from an outside of the fluid retaining structure and (b) electrically isolated from an internal environment inside the fluid retaining structure,

the electrically conductive signal layer is configured to provide structural rigidity to the fluid retaining structure,

the electrically conductive signal layer is made of a concrete-based material with steel reinforcement; and wherein the outer liner is welded to the inner liner such that the outer liner passes through a wall-roof joint of the electrically conductive signal layer.

2. The fluid retaining structure of claim 1 , wherein the electrical isolation layers are further adapted to perform fluid retention and ingress prevention functions of the fluid retaining structure.

3. The fluid retaining structure of claim 1 , wherein the inner and outer liners are waterproof.

4. The fluid retaining structure of claim 1 , wherein:

the outer liner includes an outer liner floor section; and

the electrically conductive signal layer includes an electrically conductive signal layer floor section; and

the outer liner floor section is located beneath the electrically conductive signal layer floor section.

5. The fluid retaining structure of claim 4 , wherein the electrically conductive signal layer of the floor section is constructed of interlocking precast concrete units.

6. The fluid retaining structure of claim 4 , wherein:

the outer liner includes outer liner wall sections; and

the outer liner wall sections are continuous with the outer liner floor section.

7. The fluid retaining structure of claim 6 , wherein:

the electrically conductive signal layer includes electrically conductive signal layer wall sections; and

the outer liner wall sections are wrapped around the electrically conductive signal layer wall sections.

8. The fluid retaining structure of claim 7 , wherein the electrically conductive signal layer wall sections are constructed of steel reinforced concrete.

9. The fluid retaining structure of claim 7 , wherein the wall sections and/or the floor sections of the electrically conductive signal layer are electrically isolated from each other.

10. The fluid retaining structure of claim 7 , wherein at least one of the electrically conductive signal layer wall sections incorporates lightening cavities.

11. The fluid retaining structure of claim 1 , further comprising:

internal column supports; and

cover elements for the internal column supports;

wherein the internal column supports are located inside the cover elements.

12. The fluid retaining structure of claim 11 , wherein the cover elements comprise sleeves placed over the column supports.

13. The fluid retaining structure of claim 11 , wherein the cover elements are joined to or part of a floor section of the inner liner.

14. The fluid retaining structure of claim 1 , which presents only the inner liner to any contents of the fluid retaining structure.

15. The fluid retaining structure of claim 1 , further comprising sensors for the ELDL system, wherein the sensors are located between the inner liner and the outer liner.

16. A method of retaining a fluid in a structure with an electronic leak detection and location (ELDL) system, comprising:

providing electrically non-conductive inner and outer liners to act as electrical isolation layers for the ELDL system;

placing an electrically conductive signal layer between the inner and outer liners, the electrically conductive signal layer being configured to provide structural rigidity for the fluid retaining structure; and

retaining the fluid inside the inner liner of the ELDL system,

wherein

the inner and outer liners create an environment, within an interstitial space between the inner and outer liners, that is (a) electrically isolated from the outside of the fluid retaining structure and (b) electrically isolated from an internal environment inside the fluid retaining structure,

the electronically conductive signal layer is made of a concrete-based material with steel reinforcement; and wherein the outer liner is welded to the inner liner such that the outer liner passes through a wall-roof joint of the electrically conductive signal layer.

17. A kit of parts for a fluid retaining structure having an electronic leak detection and location (ELDL) system, comprising:

electrically non-conductive inner and outer liners adapted for forming electrical isolation layers for the ELDL system; and

an electrically conductive signal layer to place between the inner and outer liners, the electrically conductive signal layer being configured to provide structural rigidity to the fluid retaining structure,

wherein

the inner and outer liners create an environment, within an interstitial space between the inner and outer liners, that is (a) electrically isolated from the outside of the fluid retaining structure and (b) electrically isolated from an internal environment inside the fluid retaining structure,

the electronically conductive signal layer is made of a concrete-based material with steel reinforcement; and wherein the outer liner is welded to the inner liner such that the outer liner passes through a wall-roof joint of the electrically conductive signal layer.