A golf course bunker protection system and method

Abstract

A golf bunker protection system 100 and method of bunker protection comprises a bunker liner 106 placed over a shaped bunker base 102 and a border wall 110 seamlessly attached to the liner 106; the bunker liner 106 defining a perimeter 108 with the attached border wall 110 preventing sand 104 scattering. The border wall 110 consists of one or more stacked slabs having polymer filaments forming a web mesh matrix that defines voids to enable a growing medium to accumulate in the voids to support the growth of natural grass along the border wall 110 and boundary of the bunker. The attachment of the wall and liner may be via cold-welding using a solvent such as acetone. The slabs may be stacked in a stepped manner and there may be angular slabs.

Description

FILED OF THE INVENTION

[0001] The present invention relates to a golf course bunker protection system and to a method of constructing a golf course bunker protection system. More particularly, the present system relates to a novel and improved liner configuration designed to enhance sand retention, prevent erosion, and ensure playability in golf course bunkers. BACKGROUND OF THE INVENTION

[0002] Golf bunkers, integral to golf course architecture, play a crucial role in shaping the game's challenges. These sand-filled hazards are strategically positioned, presenting golfers with obstacles that demand skillful navigation. Traditionally, golf bunkers consist of sand laid over a base, and while they add character to the course, their maintenance and erosion prevention have been ongoing concerns for golf course managers and groundskeepers.

[0003] In the realm of conventional golf course bunker construction, liners have often been used to address issues related to sand retention, erosion, and playability. These liners typically involve basic materials and construction techniques, with varying degrees of effectiveness. The matting or liners applied previously are often uniform in density and lack specific features to enhance sand retention or address the challenges posed by varying slopes within the bunkers. More robust alternatives, including liners with cement or bonded polymer granules, have been explored but come with higher installation costs and complexities. Porous polymer matting, a lightweight and practical alternative, has been employed but faces drawbacks such as sand penetration and potential safety hazards.

[0004] In recent developments, porous polymer matting has gained popularity as a bunker liner. While providing good vertical water permeability, these matting solutions still grapple with challenges, including sand and soil penetration, compromising their effectiveness.

[0005] The need for an improved golf bunker protection system arises from the limitations of existing solutions. Challenges such as sand displacement, liner penetration by soil particles, and difficulties in adapting to different bunker profiles necessitate an inventive approach. The present invention aims to overcome these shortcomings by introducing a novel bunker liner system with distinctive features designed to enhance ease of installation, water permeability, and sand retention, thereby elevating the overall playability and maintenance efficiency of golf course bunkers. SUMMARY OF THE INVENTION

[0006] In light of the above shortcoming, the present invention discloses a golf course bunker protection system to prevent the scattering of sand and maintain playability.

[0007] In one aspect of tire present invention, a golf bunker protection system for a golf course bunker is disclosed. The golf course bunker includes a shaped bunker base and a sand layer. The golf bunker protection system includes a bunker liner and a border wall. The bunker liner is positioned over the shaped bunker base and the sand layer is provided over the bunker liner. The bunker liner further defines an edge portion across a perimeter of the bunker liner. The border wall is seamlessly attached to the edge portion of the bunker liner. Herein the border wall is configured to be positioned towards a boundary of the shaped bunker base to prevent the scattering of sand, maintain the playability' of the shaped bunker base, and purity of the golf course bunker sand lies within an area enclosed by the border wall. The border wall includes one or more slabs arranged together to define a predetermined height along the boundary' of the shaped bunker base. Herein each of the one or more slabs includes a plurality of polymer filaments bonded together to define an irregular web mesh matrix and the plurality of polymer filaments are sparsely arranged in the irregular web mesh matrix to further define a plurality of voids to enable a growing medium accumulation therein to support the growth of natural grass on top of the border wall and along the boundary of the shaped bunker base.

[0008] In the preferred embodiment, the bunker liner and the border wall are seamlessly attached by cold welding using a solvent, particularly an acetonebased solvent.

[0009] In one embodiment, the bunker liner includes an upper layer and a lower layer. The bunker liner is arranged with the lower layer positioned against the shaped bunker base and the upper layer is positioned below the sand layer and above the lower layer. The upper layer includes a first polymer filament layer and the lower layer includes a second polymer filament layer. Herein the density of the second polymer filament layer is two to four times the density of the first polymer filament layer and the ratio of the density of the first polymer layer to the second polymer layer is constant throughout the bunker liner. The upper layer has a thickness in the range of 5 mm to 15 mm and the lower layer has a thickness in the range of 2 mm to 5 mm.

[0010] In one embodiment, the bunker liner has an overall weight in the range of 2 kg to 6 kg per sq. meter. The first polymer filament layer has a density in the range of 220 kg / m3 to 300 kg / m3 and the second polymer filament layer has a density in the range of 720 kg / m3 to 800 kg / m3.

[0011] In one embodiment, the one or more slabs stacked together define the border wall with an overall thickness in the range of 20 mm to 25 mm and an overall weight of the border wall in the range of 2 kg to 6 kg per sq. meter. The plurality of polymer filaments defining the border wall has a density in the range of 160 kg / m3 to 170 kg / m3.

[0012] In one embodiment, the growing medium includes organic material suitable for fostering the growth of the natural grass.

[0013] In one embodiment, the golf bunker protection system is structured with a stratified density configuration including the lower layer with a highest density, the border wall with a lowest density, and the upper layer having an intermediate density varying between the highest density of the lower layer and the lowest of the border wall, providing a graduated density profile from bottom to top.

[0014] In the preferred embodiment, the plurality' of polymer filaments in the one or more slabs has a consistent density throughout the border wall.

[0015] In one embodiment, tire bunker liner defines a density ratio between the first polymer filament layer and the second polymer filament layer in the range of 1:3 to 1:4, and a density ratio between the bunker liner and the border wall is in the range of 1:0.5 to 1:0.6.

[0016] In one embodiment, the one or more slabs stacked together to define the border wall are configured to extend above the depth of the sand layer to enhance the overall visual appeal of the golf course.

[0017] In light of the above, in another aspect of the present invention, a method for protecting a golf course bunker is disclosed. The method includes excavating a golf course bunker having a shaped bunker base and a sand layer, securing a golf bunker protection system in the golf course bunker, and backfilling the golf course bunker with the sand layer. The golf course bunker protection system includes placing a bunker liner over the shaped bunker base and covering the bunker liner with the sand layer. The bunker liner further defines an edge portion across its perimeter. Seamlessly attaching a border wall to the edge portion of the bunker liner configured to be positioned towards a boundary of the shaped bunker base to prevent sand scattering and maintain the playability of the shaped bunker base. The border wall includes one or more slabs arranged together to define a predetermined height along the boundary of the shaped bunker base. Herein each of the one or more slabs comprising a plurality of polymer filaments bonded to form an irregular web mesh matrix and sparsely arranging the plurality of polymer filaments in the irregular web mesh matrix to define a plurality of voids enabling a growing medium accumulation to support the growth of natural grass along the boundary of the shaped bunker base.

[0018] In the preferred embodiment, attaching the bunker liner and the border wall is seamlessly performed by cold welding using a solvent, particularly an acetone-based solvent.

[0019] In one embodiment, arranging the bunker liner in the shaped bunker base by defining an upper layer and a lower layer, with the lower layer positioned against the shaped bunker base and the upper layer positioned below the sand layer and above the lower layer. The upper layer includes a first polymer filament layer and the lower layer includes a second polymer filament layer.

[0020] In one embodiment, the density of the second polymer filament layer is two to four times the density of the first polymer filament layer and the ratio of the density of the first polymer layer to the second polymer layer is constant throughout the bunker liner.

[0021] In one embodiment, stacking the one or more slabs together defines an overall thickness of the border wall in the range of 20 mm to 25 mm and an overall weight of the border wall in the range of 2 kg to 6 kg per sq. meter, and arranging the plurality of polymer filaments within the border wall having a density in the range of 160 kg / m3 to 170 kg / m3 to support the grow th of natural grass.

[0022] In one embodiment, the bunker liner has an overall weight in the range of 2 kg to 6 kg per sq. meter, and the density of the first polymer filament layer of the upper layer is in the range of 220 kg / m3 to 300 kg / m3, and the second polymer filament layer of the lower layer is in the range of720 kg / m3 to 800 kg / m3.

[0023] In one embodiment, the growing medium includes an organic material suitable for fostering the growth of the natural grass.

[0024] In one embodiment, the bunker liner defines a density ratio between the first polymer filament layer and the second polymer filament layer in the range of 1:3 to 1:4, and a density ratio betw een the bunker liner and the border wall is in the range of 1:0.5 to 1:0.6.

[0025] In one embodiment the one or more slabs stacked together defining the border wall is configured to extend above the depth of the sand layer to enhance the overall visual appeal of the golf course

[0026] These elements, together with the other aspects of the present invention and various features are pointed out with particularity in the claims annexed hereto and form a part of tire present invention. For a better understanding of the present invention, its operating advantages, and the specified object attained by its uses, reference should be made to the accompanying drawings and descriptive matter in which there are illustrated exemplary embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The advantages and features of the present invention will become better understood with reference to the following detailed description taken in conjunction with the accompanying drawing, in which:

[0028] Fig 1 illustrates a cross-section of a golf course bunker protection system, in accordance with an exemplary embodiment of the present invention;

[0029] Fig lb illustrates a cross-section of the golf course bunker protection system with one slab defining the border wall, in accordance with an exemplary embodiment of the present invention;

[0030] Fig 2a illustrates a cross-section of a border wall of a golf course bunker protection system in a vertical orientation, in accordance with an exemplary embodiment of the present invention;

[0031] Fig 2b illustrates a cross-section of a border wall of a golf course bunker protection system in an angular orientation, in accordance with an exemplary embodiment of the present invention;

[0032] Fig 2c illustrates a cross-section of a border wall of a golf course bunker protection system where the one or more slabs are uneven, in accordance with an exemplary embodiment of the present invention;

[0033] Fig 3 illustrates a cross-section of a bunker liner for a golf course bunker protection system, in accordance with an exemplary embodiment of the present invention;

[0034] Like reference numerals refer to like parts throughout the description of several views of the drawing. DETAILED DESCRIPTION OF THE INVENTION

[0035] Embodiments are provided so as to thoroughly and fully convey the scope of the present invention to the person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present invention. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present invention. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.

[0036] The terminology used, in the present invention, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present invention. As used in the present invention, the forms "a," "an," and "the" may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms "comprises," "comprising," "including," and "having," are open-ended transitional phrases and therefore specify the presence of stated features, integers, steps, operations, elements, modules, units, and / or components, but do not forbid the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. The particular order of steps disclosed in the method and process of the present invention is not to be construed as necessarily requiring their performance as described or illustrated. It is also to be understood that additional or alternative steps may be employed.

[0037] In an aspect, the present disclosure provides a golf course bunker protection system featuring an integrated and effective mechanism for maintaining the playability and aesthetics of golf course bunkers. The conventional bunker protection systems have shown limitations, and the present disclosure addresses these shortcomings by offering a system that seamlessly combines the functions of preventing sand scattering and supporting natural grass growth.

[0038] Referring now to Figs. 1 to 3, various embodiments of the golf protection system as described. Fig. 1 illustrates a cross-section view of the golf bunker protection system (100), hereinafter referred to as the 'system,' embodying the present disclosure. The golf course bunker includes a shaped bunker base (102) and a sand layer (104). The system includes a bunker liner (106) and a border wall (HO).

[0039] The bunker liner is positioned over the shaped bunker base (102), with the sand layer (104) provided over the bunker liner (106). The bunker liner (106) defines an edge portion (108) along its perimeter. The border wall (110) is seamlessly attached to the edge portion (108) of the bunker liner (106), strategically positioned towards a boundary of the shaped bunker base (102) to prevent the scattering of sand and thereby maintaining the playability of the shaped bunker base (102).

[0040] The border wall (110) is composed of one or more slabs (112) arranged together, establishing a predetermined height along the boundary of the shaped bunker base (102). Each of the one or more slabs (112) includes a plurality7 of polymer filaments (114) bonded together to form an irregular web mesh matrix. The plurality of polymer filaments (114) within the one or more slabs (112) are sparsely arranged in the irregular web mesh matrix, creating a plurality of voids (116). The plurality of voids (116) enables a growing medium accumulation therein to support the growth of natural grass on top of the border wall (110) and along the boundary of the shaped bunker base (102).

[0041] In the preferred aspect, the attachment between the bunker liner (106) and the border wall (110) is seamlessly achieved by cold welding using a solvent, particularly an acetone-based solvent.

[0042] In one embodiment, the border wall (110) is composed of one of the slabs (112) defining an overall thickness of the border wall (110) as illustrated in Fig lb.

[0043] Referring to Fig.2a-2c, the one or more slabs (112) are stacked together defining the overall thickness ranging from 20 mm to 25 mm, with an overall weight falling within the range of 2 kg to 6 kg per square meter of the border wall (110). The plurality of polymer filaments (114) within the border wall (110) has a density in the range of 160 kg / m3 to 170 kg / m3. The plurality of polymer filaments (114) within the one or more slabs (112) are sparsely arranged in the irregular web mesh matrix, creating a plurality of voids (116). The plurality of voids (116) enables a growing medium accumulation therein to support the growth of natural grass on top of the border wall (110) and along the boundary of the shaped bunker base (102).

[0044] Referring to Fig. 2c, the illustration showcases a configuration where the one or more slabs (112) are stacked together, forming the border wall. The one or more slabs (112) exhibits uneven dimensions, with variations in both height and length. Despite their disparate sizes, they are seamlessly connected to one another, collectively defining the border wall with a pre-determined height.

[0045] Referring to Fig.3, the bunker liner (106) involves a stratified structure, including an upper layer (118) and a lower layer (120). The lower layer (120) is positioned against the shaped bunker base (102), while the upper layer (118) is located below the sand layer (104) and above the lower layer (120). The upper layer (118) includes a first polymer filament layer (119a), and the lower layer (120) includes a second polymer filament layer (119b). The density of the second polymer filament layer (119b) is two to four times that of the first polymer filament layer (119a), maintaining a constant ratio throughout the bunker liner (106). The upper layer (118) has a thickness in the range of 5 mm to 15 mm, and the lower layer (120) has a thickness in the range of 2 mm to 5 mm.

[0046] The overall weight of the bunker liner (106) falls within the range of 2 kg to 6 kg per square meter. The first polymer filament layer (119a) of the upper layer (118) has a density in the range of 220 kg / m3 to 300 kg / m3, while the second polymer filament layer (119b) of the lower layer (120) has a density in the range of 720 kg / m3 to 800 kg / m3.

[0047] In an integral aspect of the present invention, the growing medium includes organic material suitable for fostering the growth of the natural grass.

[0048] In one embodiment, the golf bunker protection system (100) is further designed with a stratified density configuration, featuring the lower layer (120) with maximum density, the upper layer (118) with a less dense arrangement, and the border wall (110) with minimum density. This provides a graduated density profile from the bottom to the top, optimizing the system's performance.

[0049] In one embodiment, the bunker liner (106) defines a density ratio between the first polymer filament layer (119a) and the second polymer filament layer (119b) in the range of 1:3 to 1:4, and a density ratio between the bunker liner (106) and the border wall (110) is in the range of 1:0.5 to 1:0.6.

[0050] In accordance with another aspect, the present invention discloses a method for protecting a golf course bunker. The method involves excavating a golf course bunker having a shaped bunker base (102) and a sand layer (104). A golf bunker protection system (100) is secured in the golf course bunker, comprising placing a bunker liner (106) over the shaped bunker base (102). The bunker liner (106) defines an edge portion (108) across its perimeter. Attaching a border wall (110) seamlessly to the edge portion (108) of the bunker liner (106). The border wall (110) is configured to be positioned towards a boundary of the shaped bunker base (102) to prevent sand scattering and maintain the playability of the shaped bunker base (102). The border wall further includes arranging one or more slabs (112) together to define a predetermined height along the boundary of the shaped bunker base (102), with each of the one or more slabs (112) comprising a plurality of polymer filaments (114) bonded together to form an irregular web mesh matrix. The plurality of polymer filaments (114) is sparsely arranged to create a plurality of voids (116), enabling a growing medium accumulation to support the grow th of natural grass along the boundary of the shaped bunker base (102). Finally, the golf course bunker is backfilled with the sand layer (104).

[0051] In the preferred embodiment of the present invention, the method emphasizes the seamless attachment of the bunker liner (106) and the border wall (110) through cold welding using a solvent, particularly an acetone-based solvent.

[0052] The main advantage of the present invention is to provide a golf bunker protection system that offers an innovative solution for enhancing the functionality and playability of golf course bunkers.

[0053] Another advantage of the present invention is the effective containment of sand within the bunker. The integrated border wall, composed of one or more slabs having a plurality of polymer filaments, acts as a robust barrier, minimizing sand scattering and reducing the need for frequent maintenance.

[0054] Yet another advantage of the present invention is tire preservation of playability by preventing sand erosion and displacement. The golf bunker protection system ensures that the shaped bunker base retains its intended design, providing golfers with consistent bunker conditions for a fair and enjoyable golfing experience. 10055 ] Yet another advantage of the present invention is the promotion of natural grass growth. The design of the border wall, featuring sparsely arranged polymer filaments forming a plurality of voids, facilitates soil accumulation. This, in turn, supports the growth of natural grass along the bunker's boundary, seamlessly integrating the bunker into the surrounding landscape.

[0056] Yet another advantage of the present invention is the golf bunker protection system stratified density configuration is advantageous for overall stability. Varying densities in the upper and lower layers of the bunker liner, coupled with the least density in the border wall, provide a graduated density profile, contributing to optimal performance.

[0057] Yet another advantage of the present invention is the ease of installation of the golf bunker protection system making it a valuable investment for maintaining golf bunkers conditions.

[0058] The foregoing descriptions of specific embodiments of the present disclosure have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present disclosure to the precise forms disclosed, and many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described to best explain the principles of the present disclosure and its practical application, and to thereby enable others skilled in the art to best utilize the present disclosure and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omissions and substitutions of equivalents are contemplated as circumstances may suggest or render expedient, but such omissions and substitutions are intended to cover the application or implementation without departing from the scope of the present disclosure.

Claims

1 / We claim1. A golf bunker protection system for a golf course bunker, the golf course bunker having a shaped bunker base and a sand layer, the golf bunker protection system, comprising:a bunker liner positioned over the shaped bunker base, wherein the sand layer is provided over the bunker liner, the bunker liner defining an edge portion across a perimeter of the bunker liner;a border wall seamlessly attached to the edge portion of the bunker liner, wherein the border wall is configured to be positioned towards a boundary of the shaped bunker base to prevent the scattering of sand, maintain the playability and purity of the golf course bunker sand lies within an area enclosed by the border wall wherein the border wall comprises:one or more slabs are arranged together to define a predetermined varied height along the boundary of the shaped bunker base, wherein each of the one or more slabs comprises a plurality of polymer filaments bonded together to define an irregular web mesh matrix, wherein the plurality of polymer filaments are sparsely arranged in the irregular web mesh matrix to define a plurality of voids to enable a growing medium accumulation therein to support the growth of natural grass on top of the border wall and along the boundary of the shaped bunker base.

2. The golf bunker protection system as claimed in claim 1, wherein the bunker liner and the border wall are seamlessly attached by cold welding using a solvent, particularly an acetone-based solvent.

3. The golf bunker protection system of claim 1, wherein the one or more slabs are stacked in a stepped manner along the perimeter of the bunker liner tobe aligned in stepped orientation along the boundary- of the shaped bunker base.

4. The golf course bunker protection system as claimed in claim 1, wherein the one or more slabs are vertically stacked along the perimeter of the bunker liner to be aligned in a vertical orientation along the boundary of the shaped bunker base.

5. The golf course bunker protection system as claimed in claim 1, wherein the one or more slabs are angularly stacked along the perimeter of the bunker liner to be aligned in an angular orientation along the boundary of the shaped bunker base.

6. The golf bunker protection system, as claimed in claim 1, wherein the bunker liner comprises an upper layer with a thickness in the range of 5 mm to 15 mm and a lower layer with a thickness in the range of 2 mm to 5 mm. wherein the bunker liner is arranged with the lower layer positioned against the shaped bunker base and the upper layer positioned below the sand layer and above the lower layer, wherein the bunker liner has an overall weight in the range of 2 kg to 6 kg per sq. meter.

7. The golf bunker protection system as claimed in claim 6, wherein the upper layer comprises a first polymer filament layer having a density in the range of 220 kg / m3 to 300 kg / m3 and the lower layer comprises a second polymer filament layer having a density in the range of 720 kg / m3 to 800 kg / m3, wherein the density of the second polymer filament layer is two to four times the density of the first polymer filament layer, and the ratio of the density of the first polymer layer to the second polymer layer is constant throughout the bunker liner.

8. The golf bunker protection system as claimed in claim 1, wherein the one or more slabs stacked together defining the border wall has an overall thickness in the range of 20 mm to 25 mm, an overall weight of the border wall in the range of 2 kg to 6 kg per sq. meter, and the plurality of polymerfilaments defining the border wall having a density in the range of 160 kg / m3 to 170 kg / m3.

9. The golf bunker protection system as claimed in claim 1, wherein the growing medium comprising organic material suitable for fostering the growth of the natural grass.

10. The golf bunker protection system as claimed in claim 6, further comprising a stratified density configuration having the lower layer with a highest density, the border wall with a lowest density-', and the upper layer having an intermediate density varying between the highest density of the lower layer and the lowest density of the border wall, providing a graduated density profile from bottom to the top.

11. The golf course bunker protection system as claimed in claim 1, wherein the plurality of polymer filaments in the one or more slabs has a consistent density throughout the border wall.

12. The golf bunker protection system as claimed in claim 1, wherein the one or more slabs stacked together defining the border wall, is configured to extend above the depth of the sand layer to enhance the overall visual appeal of the golf course.

13. A method for protecting a golf course bunker, the method comprising:a. excavating a golf course bunker having a shaped bunker base and a sand layer;b. securing a golf bunker protection system in the golf course bunker, the golf course bunker protection system comprising:i. placing a bunker liner over the shaped bunker base with the sand layer provided over the bunker liner, the bunker liner defining an edge portion across its perimeter;ii. attaching a border wall seamlessly to the edge portion of the bunker liner, configured to be positioned towards a boundary of the shaped bunker base to prevent the sand from mixing with the soil that surrounds the perimeter of the bunker liner and maintain the playability of the shaped bunker base, wherein the border wall comprises:arranging one or more slabs together to define a predetermined varied height along the boundary of the shaped bunker base, each of the one or more slabs comprising a plurality of polymer filaments bonded to form an irregular web mesh matrix,sparsely arranging the plurality of polymer filaments in the irregular web mesh matrix to define a plurality of voids (116) enabling a growing medium accumulation to support the growth of natural grass along the boundary of the shaped bunker base; andc. backfilling the golf course bunker within the confines of the boundary wall, with the sand layerwherein the growing medium comprising organic material suitable for fostering the growth of the natural grass.

14. The method as claimed in claim 13, wherein attaching the bunker liner and the border wall is seamlessly performed by cold welding using a solvent, particularly an acetone-based solvent.

15. The method as claimed in claim 13, wherein arranging the one or more slabs in a stepped manner along the perimeter of the bunker liner to be aligned in stepped orientation along the boundary of the shaped bunker base.

16. The method as claimed in claim 13, wherein arranging the one or more slabs in vertical or angular manner along the perimeter of the bunker liner to bealigned in a vertical orientation or angular orientation along the boundary of the shaped bunker base.

17. The method as claimed in claim 13, wherein arranging the bunker liner in the shaped bunker base by defining an upper layer with a thickness in the range of 5 mm to 15 mm and a lower layer with a thickness in the range of 2 mm to 5 mm, with the lower layer positioned against the shaped bunker base and the upper layer positioned below the sand layer and above the lower layer, wherein the bunker liner has an overall weight in the range of 2 kg to 6 kg per sq. meter.

18. The method as claimed in claim 17, wherein the upper layer comprises a first polymer filament layer having a density in the range of 220 kg / m3 to 300 kg / m3 and the lower layer comprises a second polymer filament layer having a density in the range of 720 kg / m3 to 800 kg / m3, wherein the density of the second polymer filament layer is two to four times the density of the first polymer filament layer, and the ratio of the density of the first polymer layer to the second polymer layer is constant throughout the bunker liner.

19. The method as claimed in claim 15, wherein stacking the one or more slabs together defines an overall thickness of the border wall in the range of 20 mm to 25 mm and an overall weight of the border wall in the range of 2 kg to 6 kg per sq. meter, and arranging the plurality of polymer filaments within the border wall having a density in the range of 160 kg / m3 to 170 kg / m3 to support the growth of natural grass.

20. Tire method as claimed in claim 18, wherein the bunker liner defines a density ratio between the first polymer filament layer and the second polymer filament layer in the range of 1:3 to 1:4, and a density ratio between the bunker liner and the border wall is in the range of 1:0.5 to 1:0.6.18

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