EP0620882A1

EP0620882A1 - Means for storing of fresh water

Info

Publication number: EP0620882A1
Application number: EP93913704A
Authority: EP
Inventors: Birger Fall; Bernt ÖHRLING; Tomas Owen
Original assignee: AQUA GALLERY AB
Current assignee: AQUA GALLERY AB
Priority date: 1992-06-16
Filing date: 1993-05-24
Publication date: 1994-10-26
Also published as: WO1993025768A1; SE9201843L; SE9201843D0; AU4364293A

Abstract

Réservoir d'eau douce, comprenant une cavité rocheuse ou un tunnel (20), ou un espace souterrain ménagé de toute autre manière. Des passages essentiellement dirigés latéralement et vers le bas (23, 24, 25) s'étendent à partir du tunnel vers des zones de faille adjacentes (K) dans la roche, ou d'autres strates retenant de l'eau, ces passages agissant comme des conduits d'entrée d'eau et étant pourvus de vannes de non-retour afin de permettre l'écoulement d'eau vers le tunnel mais pas dans la direction opposée. Un ou plusieurs éléments (27) s'étendent jusqu'au tunnel ou jusqu'aux passages d'entrée de ces derniers afin d'effectuer une vérification, de préférence continue, de la teneur en chlorure de l'eau stockée et/ou introduite dans le tunnel.A freshwater reservoir, comprising a rock cavity or tunnel (20), or an underground space provided in any other way. Substantially laterally and downwardly directed passages (23, 24, 25) extend from the tunnel to adjacent fault zones (K) in the rock, or other water-retaining strata, these passages acting as water inlet conduits and being fitted with non-return valves to allow water to flow into the tunnel but not in the opposite direction. One or more elements (27) extend to the tunnel or to the entrance passages thereof in order to carry out a check, preferably continuous, of the chloride content of the stored and/or introduced water in the tunnel.

Description

Means for storing of fresh water

The present invention relates to means for storing o fresh water.

The object of the invention has been to provide mean for storing of fresh water by the utilization of which a even temperature and a high quality of the stored water i ensured. Hereby, of course, it is desired that the storin means should be comparatively inexpensive to build and hav a very hughe storing capacity, and that the function thereo should not be noticeable, or preferably not at all, dis turbed by deep hole wells in the vicinity of the storin means .

To the just mentioned end the means for storing o fresh water according to the instant invention has bee designed, in principle, in such a manner that essentiall only sidewardly and downwardly directed bores extend fro the tunnel to adjacent crush-zones within the rock or othe water holding layers, which bores serve as water inlets an are provided with nonreturn valves to permit water flow int the tunnel but not in the opposite direction, and such tha there to the tunnel or the inlet bores thereof extend one o several members for a preferably continuous check of th chloride content of the stored and/or admitted water.

Preferably the storing means comprises lockable admis sion means for admission of fresh water from an adjacen water flow or an adjacent lake having a good water, whic lake, because of alg flora etc., should not be too shallow.

The invention will be disclosed in more details belo with reference had to the accompanying drawing.

The drawing illustrates, very diagramatically, a groun portion, generally denoted 10, which in this case is situat ed adjacent to a sea bay 11 having a surface 11A.

On the ground portion 10 there is situated a smalle lake 12, having a surface 12A. The ground water within th ground portion 10 has set itself on a level GN, the absolut height above the level of the sea surface HY varies slight ly, as is usual. In the example in the drawing there exists a couple o measure h and x, from which h is the ground water heigh above the sea surface HY, and x is the height of an imagine salt water column which results in satisfaction of th following equation, viz.:

0,99 (h + x) = l,0059x

Here 0,99 is the density of the fresh water in a give case, whereas the density of the salt water, in the same case, amounts to 1,0059.

The dashed line G denotes a transient zone betwee fresh water and salt water, where the just recited equatio is satisfied.

In an as solid and tight rock portion as possible within the ground portion 10 a storing tunnel 21 is excavat¬ ed. The rock mass has been transported out through a trans¬ port tunnel 21, which after completion of the tunnel 20 is separated therefrom by means of a tight partition wall 22, which may be openable, if desired.

From the tunnel 20 a plurality of bores 23, 24, 25 extend outwardly and downwardly to crush zones K in the rock. The bores 23, 2A, 25 open into the tunnel 20 throug nonreturn valves, which permit water flow only into the tunnel 20 but not in the opposite direction. A deep hole well, if any, that extends down into a crush zone K, cannot take advantage of the fresh water stored in the tunnel, due to the nonreturn valves.

Fresh water may be tapped from the tunnel 20 onl through one or more tap holes 26.

It should be noted that the tunnel 20 in the example, as is preferred, is situated essentially at the level of the sea surface HY.

It should be realized that the bores 23, 24, 25 are not permitted to pass the transitional layer, denoted G.

Claims

Claims.

1. Storing means for storing of fresh water, comprising a rock room or a tunnel (20) or a space in the ground made in any other manner, characterized in that there from the tunnel (20) extend essentially only sidewardly and downward¬ ly directed bores (23, 24, 25) to adjacent crush zones (K) in the rock or other, water holding layers, which bores serve as water inlets and are provided with nonreturn val¬ ves, to permit water flow into the tunnel but not in the opposite direction, and in that there to the tunnel or the inlet bores thereof extends one or more members (27) for a preferably continuous check of the chloride content of the stored and/or admitted water.

2. A storing means as claimed in claim 1, characteriz¬ ed in that the tunnel (20) is separated from a remaining unload tunnel (21) by means of a tight, preferably openable partition wall (22).

3. A storing means as claimed in claim 1 or 2 , charac¬ terized in that the storing means comprises lockable inlet means for admission of fresh water from an adjacent water flow or an adjacent lake having a good water.