Every year large scale floods cause massive property damage and claim many lives.

Typically, efforts are made to protect property from flooding by sandbagging. However, transporting large numbers of sandbags to a flood site is difficult due to the cumulative weight of the bags. Further, building protective sandbag walls is very labour intensive.

It has been conceived to use water filled barriers to selectively dam against flooding.

This has the obvious advantage that the barriers may be shipped empty and filled with water on site. U. S. Patent No. 5,857,806 to Melin describes an exemplary water filled barrier.

However, there is at present no wide spread use of hydraulic dams. It is believed this is due to the absence of a water barrier system which effectively stems flood waters.

This invention seeks to overcome drawbacks of known water barriers and hydraulic dam systems.

SUMMARY OF INVENTION In one aspect, a water filable barrier has a tubular water filable portion with a tongue projecting from one end. With this construction, the tongued end of the barrier may abut the tubular sidewall of a second such water filable barrier with the tongue wrapped around the second barrier and affixed to the first barrier. This arrangement allows the effective construction of a corner in an hydraulic dam.

In another aspect, opposed ends of each of two end-to-end water filable barriers may be overlapped within a sleeve. When the barriers are then filled with water, they

foreshorten. This pulls the overlapping portions back in order to form a high pressure end- to-end abutment between the barriers.

Accordingly, there is provided a water filable barrier, comprising: a water filable portion having an impermeable flexible membrane with a tubular sidewall and a pair of opposed end walls; a flexible tongue extending along and outwardly from one end wall of said pair of opposed end walls.

According to another aspect of the invention, there is provided an hydraulic dam, comprising: a first water filled barrier comprising: a first barrier tubular water filled portion and a first barrier flexible tongue extending outwardly from one end wall of said first barrier tubular water filled portion; a second water filled barrier comprising: a second barrier tubular water filled portion; said one end wall of said first barrier tubular water filled portion abutting a sidewall of said second barrier tubular water filled portion; said first barrier tongue extending around said second barrier tubular water filled portion and terminating at a point along said first barrier tubular water filled portion; a first band surrounding said first barrier tubular water filled portion and said first barrier tongue in order to secure a fee end portion of said first barrier tongue.

According to a further aspect of the invention, there is provided a method of erecting an hydraulic dam, comprising: placing a first water filable barrier comprising a water filable portion having an impermeable flexible membrane with a tubular sidewall and a pair of opposed end walls and a flexible tongue extending along and outwardly from one end wall of said pair of opposed end walls; placing a second water filable barrier comprising a water filable portion having an impermeable flexible membrane with a tubular sidewall and a pair of opposed end walls such that said second barrier sidewall abuts said one end wall of said first barrier; filling said first water filable barrier and said second water filable barrier ; wrapping said tongue around said second water filable barrier and along an end portion of said first water filable barrier; affixing a free end portion of said tongue to said first water filable barrier.

According to another aspect of the invention, there is provided a method of erecting an hydraulic dam, comprising: in respect of first and second water filable barriers, each

comprising a water filable portion having an impermeable flexible membrane with a tubular sidewall: overlapping an end portion of said second of said water filable barriers with an end portion of said first of said water filable barriers within a sleeve surrounding said end portions; filling said first and second water filable barriers to thereby cause said first and second water filable barriers to foreshorten and form a high pressure end-to-end abutment between said first and second water filable barriers.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings which illustrate example embodiments of the invention, figures la and lb are water filable barriers made in accordance with this invention, figures 2a and 2b illustrate the barriers of figures la and lb, respectively, in a filled condition, figures 3 a and 3b illustrates the forming of a hydraulic dam corner utilizing the water filled barriers of figure 2b, figures 4a and 4b illustrate the forming of a join between end-to-end water filable barriers; figure 5 illustrates an hydraulic dam erected in accordance with an aspect of this invention; and figure 6 illustrates another hydraulic dam in accordance with another aspect of this invention.

DETAILED DESCRIPTION Referring to figure la and 2a, a water filable barrier 10 has a tubular sidewall 14 and opposed end walls 16 and 18, formed by sealing the tubular sidewall closed at either end. A cap sealed flush mounted port 20 is provided to allow the barrier to be filled or emptied of water. The port may and cap may be threaded so that the cap may thread into the port and seal same. Figure la illustrates the barrier in an empty state and figure 2a in a water filled state. The barrier 10 may be made of an impermeable flexible material. A suitable material is a linear low density polyethylene (LLDP) material such as POLYFLEX IIIt produced by PolyFlex, Inc. of Grand Prairie, Texas. An advantage of an LLDP is that

it has no plasticisers which rodents consider as a food. A further advantage is that the material is chemically resistant.

While a range of barrier dimensions may be suitable, exemplary dimensions for an empty barrier intended to form the base of a water barrier wall are 11' (3.35 m) wide by 50' (15.24 m) long. Such a barrier has a circumference of about 23' (7 m) when filled. Suitable dimensions for an empty barrier which will be at the top of a water barrier wall (i. e., stacked on basal barriers) are 5.5' (1.67 m) wide by 30' (9.14 m) long. Such a barrier has a circumference of about 11.5' (3.48 m) when filled.

Barrier 10 may have a visual mark 24 spaced a set distance from end 16 of the barrier for reasons described hereinafter.

Figures lb and 2b illustrate a modified barrier 30, identical to barrier 10 except that a flexible tongue 32 extends outwardly from one end wall 36 of the barrier. Tongue 32 is integrally formed with the barrier and is made of the same material as the rest of the barrier.

As is apparent from the figures, the tongue has a sheet-like configuration. The tongue has a length as long as, or longer than, the circumference of the barrier when filled with water.

Indeed, a tongue 33' (10.06 m) long would be suited to a basal barrier having the aforenoted example dimensions whereas a tongue 15' (4.57 m) long would be suited to the example top barrier.

In order to form an hydraulic dam from water filled barriers 10,30, it is necessary to join adjacent water barriers together. Water barriers 30 are designed to permit effective corner joins. Turning to figure 3a, bands 40a, 40b may be placed on the ground. A first water barrier 30a may then be placed on band 40a with its tongue 32a outstretched. A second water barrier 30b may then be placed on the ground over band 40b so that the tubular sidewall 14b of the second barrier abuts the tongued endwall 36a of the first barrier 30a. The second barrier 30b is also placed with its tongue outstretched and such that its end wall 36b is substantially flush with the far edge 42a of tubular sidewall 14a of the first barrier. Next the barriers 30a, 30b may be filled with water. Then, tongue 32a may be wrapped around the second barrier 30b and over an end portion of the first barrier 30a.

Next, band 40a may lash the free end portion of tongue 32a to barrier 30a, as illustrated in

figure 3b. Band 40a is provided with a buckle 44a for this purpose. With tongue 32a in place, tongue 32b may be wrapped over tongue 32a and over an end portion of the second barrier 30b. Utilizing buckle 44b, band 40b may then lash the free end portion of tongue 32b to barrier 30b, as illustrated in figure 3b.

Alternatively, rather than folding the tongues over the barriers as shown in figures 3a and 3b, the tongues may be folded under the barriers. This results in a small increase in labour when installing an hydraulic dam, but provides the advantage that the weight of a full barrier assists in keeping the lashed tongues in place. To achieve this result, after placement of the bands, the first barrier 30a is placed on band 40a with its tongue folded over the end of the barrier 30a. The second barrier is then placed with its tongue outstretched and its tubular sidewall 14b abuting the tongued end wall 36a of the first barrier. Next the folded back tongue of the first barrier is laid over the second barrier and wrapped around and underneath the second barrier. The tongue of the second barrier is then wrapped underneath the first barrier tongue. The barriers may then be filled with water and the tongues lashed in place by the belts 40a, 40b.

In some situations, a sufficiently secure corner may be achieved only be using tongue 32a. In such case, a barrier 10 could be substituted for barrier 30b. Further, in such instances, it would be possible to form a corner anywhere along the second barrier rather than only at one end thereof.

In order to join barriers end-to-end, sleeves are used. Turning to figure 4a, a tubular sleeve 50 may be fabricated of the same material as the barriers. These sleeves may have a length of 12' (3.65 m) and a circumference to match that of the barriers. A sleeve 50 is slid onto each (tongueless) barrier 10 at a factory where the barriers are made. Additionally, as aforenoted, a visual mark 22 (figure la) is made on each barrier 10 at a set distance from end 16 of the barrier 10. In the field, a first barrier 10a is placed. Next, the end 18b of a second barrier 10b or 30 is placed over the end 16a of the first barrier 10a such that the end 18b of the overlapping barrier is at the visual mark on the first barrier lova. The sleeve 50 is then slid along the first barrier 10a so that the overlapping portion of the barriers is roughly in the middle of the sleeve, as seen in figure 4a. Next, the barriers are filled with water. As they are filled, the barriers foreshorten. This causes the ends 16a, 18b of the opposed

barriers to pull back from one another and results in a high pressure end-to-end abutment between said first and second barriers once they are full, as seen in figure 4b. The amount of overlap of the empty barriers sufficient to obtain this result will vary dependent upon the construction of the barriers. Barriers having the aforenoted example dimensions with endwalls resulting from sealing the ends of the tubular sidewall of the barrier, will foreshorten about 6% when filled. Thus, a 50' (15.24 m) long barrier will foreshorten about 3' (0.9 m) when filled, with about one-half of the foreshortening occurring at each end of the barrier. In these circumstances, an overlap of about 3.3' (1.0 m) prior to filling has been found to be satisfactory. Thus, the visual mark for such barriers is made 3.3' (1.0 m) from end 16 of the barriers. If the barriers are not overlapped in the sleeves prior to filling, the end walls will take on an elliptical shape when full which would provide an area susceptible to leaking.

With a string of end-to-end barriers, the empty barriers should be overlapped in sequence. Thus, a first barrier, at one end of the string, is entirely on the ground, a second barrier overlaps the first barrier, a third barrier overlaps the second barrier, and so on. Such a string of barriers is filled in the opposite sense such that the barrier at the end of the string distant from the first barrier is filled first with the barriers being consecutively filled from that end and the first barrier being filled last. In this way, when a barrier is filled, its end 18 is over end 16 of an empty barrier and does not disturb the placement of end 16 of this empty barrier. In contrast, if the barriers were filled commencing with the first barrier, the end 16 of a barrier being filled would rise up and disturb the placement of the end 18 of the next adjacent empty barrier. This, in turn, could preclude the obtaining of the high pressure abutment between barriers once this next adjacent barrier is filled.

An hydraulic dam formed as a string of barriers may suffice for certain flood conditions. However, the strength of the dam, and its ability to prevent water getting through it, increases if several rows of barriers are placed side-by-side in a staggered configuration. This is illustrated in figure 5. Turning to figure 5, to build a multi-row hydraulic dam 58, ground sheets 60 may be placed. The ground sheets assist in avoiding punctures in the barriers due to matter on the ground. The ground sheets may be made of the same material as the barriers.

After placement of any ground sheets, a plurality of belts 40 may be placed. At least some of the belts may be joined to anchors 62 which are anchored into the ground along the outside (flood water facing) and inside edge of the dam. Next plural rows of empty barriers 10,30 may be placed over the belts. For any given row, end-to-end barriers are placed and coupled as described in conjunction with figures 4a and 4b. Similarly, for any given row, corner barriers 30 are placed as described in conjunction with figures 3a and 3b. Figure 5 shows three such rows 64a, 64b, 64c of barriers. As will be apparent, a corner in a dam having more than one row of barriers naturally forces placement of the barriers in a staggered configuration. To facilitate wrapping of the tongues extending from the barriers of the inner rows 64b, 64c, the tongues may pass underneath the barrier which it will surround and be laid on top of any more outwardly placed barrier.

Next the flood barriers may be filled with water and the tongues 32 folded over and lashed by belts 40. In this regard, as seen in figure 5, each tongue of the outer row 64a is lashed by a belt which surrounds only the barrier from which that tongue extends. Each tongue of the middle row 64b is lashed by a belt which surrounds the barrier from which it extends and, as well, the adjacent barrier in the outer row. Each tongue in the inner row 64c is lashed by a belt surrounding adjacent barriers in all three rows. All three rows 64a, 64b, 64c of barriers are also lashed together at other points along the length of the row, also as seen in figure 5.

Most floods involve flood water levels less than 3' (0.9 m). The exemplary basal barriers, when full, have a diameter of about 3' (0.9 m). However, to achieve a proper weight ratio to contain a flood, a hydraulic dam should be at least about twice the height of the flood waters. This suggests a need to stack barriers. The aforedescribed barriers may be stacked as illustrated in figure 6. Turning to figure 6, three rows 64a, 64b, 64c of basal barriers may be placed, joined, and filled as described in conjunction with figure 5.

However, before their placement, additional long belts 140 may be placed with the other belts 40. After the base rows have been completed, belts 240 are placed on the bottom rows 64a, 64b, 64c and empty barriers are placed on the base rows 64a, 64b, 64c over these belts 240. These empty barriers are joined together and filled in the same manner as the base rows, but to form two rows 66a, 66b of barriers as shown in figure 6b. The two rows 66a, 66b are then lashed together by bands 240. Lastly a single row 68 of top barriers may be

placed atop rows 66a, 66b. Finally, the bottom rows 64a, 64b, 64c, middle rows 66a, 66b, and top row 68 are lashed together by long belts 140. This then completes an hydraulic dam 70 having a pyramidal cross-sectional shape.

In addition to a (medially positioned) inlet port, the barriers 10,30 may have outlet ports proximate either end.

Other modifications will be apparent to those skilled in the art and, therefore, the invention is defined in the claims.