Patent Application
20110170952
This application claims priority from Australian provisional patent application No. 2007904711 filed on 30 Aug. 2007, the contents of which are to be taken as incorporated herein by this reference.
The present invention relates to methods of irrigating plants in hardscape locations with hardscape water runoff and irrigation systems to perform the same.
Many cities around the world feature trees and other plants which line streets, car parks and footpaths. Such trees and plants provide both aesthetic and functional purposes.
As urban areas become increasingly dense, trees are required to grow in small openings on footpaths and roadways. Hardscape surfaces surrounding the trees typically have little or no permeability to water and this limits water reaching the tree roots. The trees and plants can be watered using dedicated irrigation systems, but there are high costs associated with the installation and maintenance of such systems. In the absence of a dedicated irrigation system, water availability can be limited to rain which falls directly onto an opening in the hardscape around the base of the tree, or water running across the opening. In many situations this is insufficient to facilitate and maintain the growth of the tree.
Further problems with irrigation of plants in hardscape areas result from compaction of the soil. Compaction of the soil underlying the hardscape is necessary to maintain the structural integrity of the hardscape. However, the compacted soil can further restrict the accessibility of water to the trees.
The water table in and around areas with large areas of hardscape can also become deleted due to the low potential for absorption of water into the soil limiting the availability of subterranean water supplies to trees.
Much of the available water in the form of rain which could naturally irrigate trees in hardscape locations runs across the hardscape and into the storm water system. Indeed, storm water systems are designed to facilitate the directed flow of water from roads, footpaths and buildings to prevent water build-up and flooding. Typically roads and footpaths are angled to direct the flow of water to gutters which themselves are angled to further direct the water flow to storm water drains. From there, the water may be directed out to sea or to water treatment facilities.
Much rainfall, which could be used to naturally water trees in hardscape locations, is therefore wasted. This is of particular importance in areas with minimal rainfall, wherein utilisation of natural water supplies can represent significant cost savings as well as benefiting the growth of plants such as streetscape trees.
Reducing the level of hardscape water runoff can also lead to reduced maintenance and processing costs associated with storm water treatment.
There is a need for cost-effective methods to utilise hardscape water runoff to supply water to trees and other plants in hardscape locations.
The discussion of the background to the invention herein is included to explain the context of the invention. This is not to be taken as an admission that any of the material referred to was published, known or part of the common general knowledge in any country as at the priority date of the application.
The present inventor has discovered that creating an aperture in the hardscape is an effective way to irrigate trees and other plants in hardscape locations by increasing the flow of hardscape water runoff into the soil underlying the hardscape. In this manner the water availability to the roots of trees and other plants located in hardscape locations can be increased to promote their growth.
The present invention is particularly suitable for the irrigation of “trees”. However, other plants including shrubs, grasses, vines and flowers can also be irrigated using the methods and systems described herein. Accordingly, any reference to “trees” throughout this specification should be taken to include other plants, such as shrubs, grasses, vines, flowers, etc.
The present invention provides a method for irrigating one or more trees in hardscape locations, the method including creating an aperture through the hardscape and covering the aperture with a cap, wherein the aperture and cap allow water runoff to flow into the soil underlying the hardscape in the vicinity of roots of the one or more trees.
The present invention also provides a method for installing an irrigation system for trees in a hardscape location, the method including creating an aperture in the hardscape and covering the aperture with a cap, wherein the aperture and cap allow hardscape water run-off to flow into the soil underlying the hardscape in the vicinity of roots of the one or more trees
The present invention also provides a method of maintaining an irrigation system formed as described herein, the method including visually inspecting the aperture and cap and, if necessary, removing debris from the aperture or cap.
The present invention also provides an irrigation system for trees in a hardscape location, the system including an aperture in a hardscape and a cap, wherein the aperture and cap are configured to allow water runoff to flow from the hardscape into the soil underlying the hardscape.
The present invention also provides a gutter cap including a support body and a grate section, the gutter cap configured to fit over an aperture in a gutter so as to allow water runoff to flow from the gutter into the soil underlying the hardscape.
The present invention also provides a cap when used for hardscape water runoff irrigation systems for trees in hardscape locations.
The aperture may be created in a base or a kerb of a hardscape gutter.
A bore may be created in the soil underlying the aperture to direct water toward the roots of the tree.
The present invention will now be described in relation to various embodiments illustrated in the accompanying drawings. However, it must be appreciated that the following description is not to limit the generality of the above description.
In the drawings:
a) to 3(c) are top views of different cap configurations.
a) is an enlarged cross-sectional view of the aperture and cap in the gutter that is shown in
b) is an enlarged cross-sectional view similar to
c) is an enlarged cross-sectional view similar to
a) to 6(d) are cross-sectional views showing various configurations of aperture and bore in a hardscape water runoff irrigation system.
a) is a perspective view of a housing member according to an embodiment of the invention.
b) is a cross-sectional view of the housing member from
c) is a perspective view of another embodiment of a housing member according to the invention.
d) is a cross-sectional view of the housing member from
It is to be understood that various additions, alterations and/or modifications may be made to the parts described without departing from the ambit of the present invention.
As used herein, the term “hardscape” is taken to mean any substantially non-water permeable man-made structure where the soil profile is no longer exposed. Hardscape includes but is not limited to paved areas such as roadways, footpaths and car parks.
“Paved” is taken to mean a surface covered with paving materials. Paving materials include asphalt, bitumen, concrete, pavers and bricks, etc.
“Hardscape water runoff” is used to describe water which flows across hardscape. This includes not only natural rainfall, but also includes other sources of water including excessive water from irrigation.
A “gutter” is taken to mean a depression in the hardscape used to divert water away from the hardscape.
The figures illustrate a tree 100 that is growing in a hardscape location through an opening 102 in the hardscape 106, such as a paved or concrete area. The hardscape location includes a gutter 112. The gutter consists of a base 118 and a kerb 119. A top surface of the base 118 slopes downward towards the kerb 119 to direct the flow of water to the kerb 119 of the gutter 112. The hardscape location may be a suburban street having gutters 112 running along the sides of the roadway, and trees 100 growing through an opening 102 in the footpath. The gutter 112 will generally collect water that has run off from hardscape surfaces, such as roads and footpaths, as well as non-hardscape surfaces such as lawns or grassed areas.
The figures show an irrigation system 103 including an aperture 108 in the hardscape 106, and a cap 110. The aperture 108 is created through the hardscape 106 and it is covered with a cap 110. The aperture 108 and cap 110 allow water run-off to flow into the soil 114 underlying the hardscape 106 in the vicinity of roots 140 of the one or more trees 100. It will be appreciated that the aperture 108 is different to, and usually separated from, the opening 102 through which the tree 100 is growing.
The aperture 108 may be created at any location in the hardscape structure that permits water to flow into the soil in the vicinity of roots of the tree 100. However, in the illustrated embodiments the aperture 108 is created in the gutter 112. Creating the aperture 108 in the gutter 112 maximises water flow into the aperture 108, because ground water from large areas of the hardscape 106 and adjacent areas is typically directed into the gutter 112. Therefore, the aperture 108 in a gutter 112 is exposed to greater volumes of water than an aperture in another location in the hardscape. Thus, during a rain event or some other period in which water falls on the hardscape 106, water runs off across the surface of the hardscape 106 and into the gutter 112. The flow of water across the hardscape 106 is directed by the slope of the hardscape 106 into the gutter 112. As the water flows along the gutter 112, it passes over the aperture 108 and through the cap 110 in to the underlying soil 114. This arrangement, whereby the runoff is directed into the soil adjacent a tree, is different to a storm water drain arrangement in which a drain is connected to a network of storm water pipes that directs the water away from the hardscape location.
The aperture 108 in the hardscape 106 or gutter 112 may be created in existing hardscapes or gutters or it may be created when the hardscape or gutter is being formed. The aperture 108 may be created in existing hardscape 106 or gutter 112 by drilling and/or concrete cutting. Drilling may be advantageous as the aperture 108 may be easily created to different diameters by using different drill bits.
Alternatively, the aperture may be created by using appropriate formwork when creating a concrete hardscape 106 or gutter 112, or by leaving out one or more pavers or bricks during the laying of a paved hardscape 106 or gutter 112.
The aperture 108 may be any suitable shape. Circular apertures 108 are advantageous in that a circular cap 110 designed to fit the aperture 108 cannot fall through the aperture 108 when rotated around different axes. Moreover, circular apertures 108 are easily created by drilling and accessory components such as circular caps 110 and pipes 130 are typically more readily available and cheaper.
The dimensions of the aperture 108 are not particularly limited, although apertures that are too small will not capture enough water run off, whilst the larger the aperture the more visual impact it will have on the streetscape and the associated cap 110 is also likely to be more expensive. More specifically, for apertures 108 of circular shape, the diameter of the aperture may be about 100 to 500 mm. In typical suburban streets, circular apertures having a diameter of about 150 mm may be suitable. For apertures 108 that are not circular, average aperture widths equivalent to the aforementioned circular aperture diameters can be used.
The aperture 108 is covered with a cap 110. The cap 110 includes a support body 111 and a grate section 113 and is configured to fit over the aperture 108 in the gutter 112 so as to allow water runoff to flow from the gutter into the soil 114 underlying the hardscape 106. For many applications the cap 110 needs to be weight bearing. It is also advantageous that the cap 110 is resistant to environmental exposure such as to water and sun exposure. The cap 110 can reduce the build-up of debris in the aperture 108, provide safety by covering the aperture 108 and reduce erosion of the soil 114 underlying the aperture 108 or hardscape 106, while still permitting water to flow from the hardscape 106 through to the underlying soil 114.
In most cases, it will be desirable to fix the cap 110 over the aperture 108 to prevent accidental removal of the cap and reduce the incidence of theft and/or vandalism. To this end, the cap 110 and/or the aperture/108 and/or the gutter 112 may include fixing means (not illustrated) for fixing the cap 110 over or in the aperture 108. The fixing means may include one or more fasteners, such as bolts, suitable for use in masonry. Alternatively, the fixing means may be a suitable adhesive.
In some embodiments, the cap 110 is a disc-like structure that can be placed over the aperture. In some other embodiments, such as the one shown in
The sleeve member 120 is able to fit into the aperture 108 and may be used to hold the cap 110 in place. For example, the sleeve member 120 and the aperture 108 may be of substantially the same diameter so that the sleeve member 120 forms an interference fit within the aperture 108. Alternatively, or in addition, the outside surface of the sleeve member 120 may include one or more barbs (not illustrated) to hold the sleeve member 120 in place in the aperture 108. Cements or glues could also be used to adhere the sleeve member 120 in the aperture 108.
Various embodiments of caps 110 are shown in
In one embodiment shown in
In some other embodiments, such as the one that is shown in
Materials for the manufacture of the cap 110 include metal, metal alloys and plastics. Ideally the material will have some resistance to damage caused by exposure to water and sunlight and the material will be sufficiently strong to prevent breakage from normal pressures applied to the gutter 112 and/or hardscape 106, such as those from pedestrians and vehicles.
In some embodiments, a filtering material 134 is inserted into the aperture 108 and/or the bore 128. The filtering material 134 may be any material which is able to filter debris and/or pollutant chemicals. Gravel is an example of a suitable filtering material 134. The filtering material 134 may reduce the risk of the aperture 108 and/or bore 128 clogging with debris, reduce pollutants from entering the soil 114 underlying the hardscape 106, and/or reduce the erosion of the soil 114 underlying the aperture 108 and/or surrounding the bore 128.
In different circumstances, it will be appreciated that different configurations of hardscape water runoff irrigation systems may be more suited. In situations where the tree 100 is set close to the gutter 112, it may be sufficient to create an aperture 108 in the gutter 112 without further directing the flow of the water. However if the tree 100 is located a number of metres from the gutter 112 or has roots 140 which are deep, it may be appropriate to further direct the flow of water from the aperture 108 and towards the tree roots 140. The bore 128 can therefore be used to direct water towards the tree roots 140 and away from a road, footpath or car park. This may reduce the incidence of tree roots 140 growing towards the road or footpath, hence minimising the possibility of damage to the hardscape structure 106.
As illustrated in
The length of the bore 128 may extend greater than 20 metres. In some embodiments, the length of the bore 128 is less than 5 metres. The flexibility of bore 128 length allows the irrigation system 103 to be used in many different situations. For example the bore 128 may be created to direct hardscape water runoff from the aperture 108 and towards the roots 140 of a tree 100, wherein the tree 100 is located 1 metre from the gutter 112 or 20 metres from the gutter 112.
In some embodiments, the bore 128 is lined with one or more pipes 130. The pipe 130 can be used to reinforce the bore 128 so as to prevent caving in of the bore 128 and prevent erosion of the soil 114 surrounding the bore 128. In one embodiment, the pipe 130 is open-ended allowing water to flow through the pipe 130 from the aperture 108 in the gutter 112 through to the soil 114 at the other end of the pipe 130. Filtering material 134 may be included in the pipe 130, either fixed, or in loose form. The filtering material 134 can function to prevent soil 114 from entering and clogging the pipe 130.
The pipe 130 may have more than one outlet positioned in the pipe 130 to allow the release of water at different points along the length of the pipe so as to deliver water to different regions of soil 114. Alternatively, the pipe itself may be formed from a water permeable material.
In some embodiments, a pipe 130 is attached to the cap 110 to provide a water-tight seal, thereby minimising leakage. The pipe 130 may be attached to the cap 110 by any suitable means, such as via an interference fit or by using a threaded connection. In some other embodiments, a seal (not shown) may be formed between the gutter 112 and the pipe 130 using silicone sealants or cements.
In some embodiments, the pipe 130 includes moisture absorbent material for retaining moisture in the vicinity of the bore 128. The moisture absorbent material may be retained in the pipe using gauze or net material that is held within the pipe.
For embodiments of the invention in which the aperture 108 is created in a region including the join between the base 118 and the kerb 119 of the gutter 112, different configurations of the cap 110 will be required. In some embodiments, the cap 110 is created by two intersecting planes, wherein the angle between the intersecting planes is substantially the same as the angle between the base 118 and the kerb 119 of the gutter 112, so as to allow the cap 110 to cover the aperture 108. The angle between the intersecting planes may be between 45 and 180 degrees. In this case, the cap 110 may be created by bending the cap 110 into the desired configuration or by joining two pieces of cap material to create the desired configuration. In some other embodiments, the cap 110 may only encompass the horizontal plane, wherein the cap 110 covers only the portion of the aperture 108 in the base 118 of the gutter 112.
In an embodiment of the invention that is shown in
a) and 7(b) show one embodiment of the housing member 136. In this embodiment, the housing member 136 includes a skirt 137 and a base 138. Materials for the manufacture of the skirt 137 include plastic, metal and metal alloys. The skirt 137 may be permeable or non-permeable. For example, a skirt 137 which is non-permeable may be constructed from PVC pipe. In another embodiment, a skirt 137 which is permeable may be constructed using a mesh material.
The base 138 may be constructed from materials including plastic, metal, metal alloys and fabrics. The base 138 may be created from said materials so as to form configurations which permit water permeability while retaining filtering material 134. Such configurations may include a grate or mesh. In another embodiment the base 138 may include a permeable geotextile.
The base 138 may be attached to the skirt 137 by mechanical and chemical forms of adhesion. Mechanical means of adhesion include use of screws, rivets, threaded joins and interference fits. Chemical methods include use of glues or cements.
The housing member 136 may be attached to the cap 110 by mechanical or chemical means as previously described herein. Alternatively, the housing member 136 may be separate from the cap 110 and may lie at the base of the aperture 108 or bore 128 on the underlying soil 114 as shown in
The housing member 136 may also include a handle 139 to facilitate its removal from the aperture 108 or bore 128. In the embodiment that is shown in
In another embodiment that is illustrated in
In some embodiments, the aperture 108 is used to direct substances towards the roots 140 of the tree 100. Such substances include, but are not limited to, nutrients or fertilisers. These may be in liquid form or solid form.
The irrigation system may be maintained by visually inspecting the aperture 108 and cap 110 and, if necessary, removing debris therefrom. The filtering material may also be cleaned or replaced at this stage. The inspection may be performed periodically.
In conclusion, it must be appreciated that there may be other various and modifications to the configurations described herein which are also within the scope of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2007904711 | Aug 2007 | AU | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/AU2008/001279 | 8/29/2008 | WO | 00 | 2/1/2011 |
