A SYSTEM AND A METHOD FOR PREVENTING BEACH EROSION
FIELD OF INVENTION
[0001] The embodiment herein generally relates to an erosion control system. More specifically, the invention provides a system and a method for preventing beach erosion using a special type pervious concrete (Draincrete) underlain by Poly-Filter or geotextile (DUPF). Further, the invention provides a method for manufacturing the special type of Draincrete slabs using cementitious material.
BACKGROUND AND PRIOR ART
[0002] Beach Erosion has become a headline issue as it continues to be a growing problem on coastlines around the world. Whether the shore is sheltered or exposed, elements like currents, waves, and sea level changes play a significant role in causing erosion. The soil erosion takes place when the water with velocity higher than the scouring velocity of the soil, meets the soil surface. Development within coastal areas has increased interest in erosion problems; it has led to major efforts to manage coastal erosion problems and to restore coastal capacity to accommodate short and long-term changes induced by human activities, extreme wave action and sea level rise. The erosion problem becomes worse whenever the counter-measures (i.e. hard or soft structural options) applied is inappropriate, improperly designed, built, or maintained and if the effects on adjacent shores are not carefully evaluated.
[0003] Presently, revetment or sea walls like structures help in preventing erosion, but they are not cost effective, durable and socially favorable. The sea wall may save the area on the landside from the incoming waves, but the waves get reflected and create turbulence, eroding and destroying the beach on the seaside. Further, the maintenance, the intensity of erosion is also more and labor required is high for structures constructed using the prior art techniques.
[0004] In some other prior arts, stone blocks or concrete blocks are used to control the erosion. But the sand underneath these blocks may get washed away and they sink with time. The construction cost and labor required for the construction is more. Further,

these structures require periodic maintenance as the durability and reliability is lesser. In addition to that, the reflected waves may erode the beach and destroy it in due course of time.
[0005] Therefore, there is a need in the prior art to develop a system and a method for preventing beach erosion. Instead of blocking the waves directly, the waves can be made to enter tangentially at the shoreline which is protected using an armor of Draincrete Underlain by Poly-Filter (DUPF) that rectifies the drawbacks of the above mentioned prior arts. Further, there is a need to develop a method for manufacturing the special type of Draincrete or Drain-concrete which is a special type of porous concrete block that can be manufactured and can be used for various erosion prevention applications.
OBJECTS OF THE INVENTION
[0006] Some of the objects of the present disclosure are described herein below:
[0007] A main object of the present invention is to provide a system and method for
preventing beach erosion using a special type Draincrete Underlain by Poly-Filter or
geotextile (DUPF).
[0008] Another object of the present invention is to provide a system and a method
for manufacturing the special type of Draincrete slabs using cementitious material that
can be used for erosion prevention applications.
[0009] Still another object of the present invention is to provide a system and a
method for preventing beach erosion by burying a layer of one or two slabs on a sea
side under the sand and gradually keep up with the beach profile.
[00010] Yet another object of the present invention is to provide a system and a
method for preventing beach erosion by continuing the pavement of DUPF to a
landward side and carrying on for 2 to 3 meters above the possible expected run-up of
the waves.
[00011] Another object of the present invention is to provide a system and a method
for preventing beach erosion by either burying the slabs at the sides of the revetment
under enough of sand or terminating on an abutment.

[00012] Another object of the present invention is to provide a system and a method
for preventing beach erosion by binding adjacent blocks using stainless steel cables or
steel strips or wires passing over/through the slabs and bolting/welding them together,
at the same time allowing flexibility of movement of slabs by 1-2cms.
Another object of the present invention is to provide a system and a method for
preventing beach erosion by anchoring some of the Draincrete blocks for safety against
displacement. It may be done using a threaded steel anchor rod with an attached tile,
concrete or metal, embedded in sand to a suitable depth.
[00013] In the above case, the rods are allowed to pass through the geofabric and the
hole in the Draincrete slab and fixing by means of washers and nuts.
[00014] The other objects and advantages of the present invention will be apparent
from the following description when read in conjunction with the accompanying
drawings, which are incorporated for illustration of preferred embodiments of the
present invention and are not intended to limit the scope thereof.
SUMMARY OF THE INVENTION
[00015] In view of the foregoing, an embodiment herein provides a system for preventing beach erosion, wherein the system comprises of a plurality of Draincrete slabs, a plurality of geotextile sheets, a plurality of a stainless-steel cables/ strips, a plurality of anchor rods, a plurality of anchor plates. The Draincrete slabs are laid over the geotextile sheets to create a revetment in such a way that to allow sea waves to move over the pavement up to the natural run-up level and recede. The adjacent Draincrete slabs are laid over the geotextile sheets are bound to each other using the stainless-steel cables or strips for unified action and stability. The anchor rods are attached in the anchor plate using washers and nuts. The anchor plate along with the anchor rod is buried deep in sand at a predetermined interval and rod is made to pass through the geotextile and Draincrete slab.
[00016] According to an embodiment, the anchor plate may be a concrete anchor plate or a metal tile. The adjacent Draincrete slabs laid over the geotextile sheets are bound to each other using wires passing over or through the slabs and bolting or welding them

together. Further, a play of predetermined distance is allowed between the Draincrete slabs thereby to provide minimal flexibility for a pavement when laid over the beach. If sides of the revetment not terminate on an abutment then the Draincrete slabs at the end are to be buried deeper in the sand and anchored. In addition to that, a gradual gradient provided to the exposed pavement inwardly for safety.
[00017] According to an embodiment, the stainless-steel cables or strips are connected to the Draincrete slabs with allowable flexibility thereby to enable slight adjustment and movement in the Draincrete slabs. The pavement of Draincrete slabs is laid after excavation of a site of the beach and required gradient for the revetment designed based on the site.
[00018] According to an embodiment, a method for manufacturing Draincrete slab to prevent beach erosion comprising the step of, casting the Draincrete slabs with cement, coarse aggregate, mineral admixtures, water, in the absence of fine aggregate, with a water-cement ratio ranging from 0.27 to 0.3. The slabs are cast providing provisions for accommodating the anchoring and providing a slanting design at the outer edges for the edge Draincrete slabs.
[00019] According to an embodiment, a method for preventing beach erosion comprising the steps of, burying a layer of geotextile sheet that covers both a sea side and landward side area of the beach, burying a layer of one or two Draincrete slabs on a sea side under the sand over the geotextile sheet, keeping up with the beach profile gradually, continuing the pavement of Draincrete slabs over the geotextile sheet to a landward side for 2 to 3 meters above the possible expected run-up of sea waves, either burying the slabs at the sides under enough of sand or terminating on an abutment, binding adjacent blocks or slabs using stainless steel cables or steel strips, anchoring some of the inward placed Draincrete slabs using a threaded stainless-steel anchor rod, attaching an anchor plate with the threaded stainless-steel anchor rod using washer and nuts at bottom of the anchor plates, making the steel rod to pass through the geotextile and the hole in the Draincrete slab and fixing by means of washer and nuts, and

providing support to beach sand by allowing sea waves to enter the Draincrete slabs
laid over the geotextile tangentially.
[00020] According to an embodiment, the method for preventing beach erosion further
comprising the steps of, anchoring the Draincrete slabs laid over the geotextile sheet at
predetermined intervals by providing anchor rods with anchor plates buried deep in the
sand and providing a gradual gradient to the exposed pavement inwardly to increase the
safety.
[00021] These and other aspects of the embodiments herein will be better appreciated
and understood when considered in conjunction with the following description and the
accompanying drawings. It should be understood, however, that the following
descriptions, while indicating preferred embodiments and numerous specific details
thereof, are given by way of illustration and not of limitation. Many changes and
modifications may be made within the scope of the embodiments herein without
departing from the spirit thereof, and the embodiments herein include all such
modifications.
BRIEF DESCRIPTION OF DRAWINGS
[00022] The detailed description is set forth with reference to the accompanying
figures. In the figures, the left-most digit(s) of a reference number identifies the figure
in which the reference number first appears. The use of the same reference numbers in
different figures indicates similar or identical items.
[00023] Fig.1a illustrates the wave action and its effect on beaches before shore
erosion, according to the prior art herein;
[00024] Fig.1b illustrates the wave action and its effect on beaches after shore erosion,
according to the prior art herein;
[00025] Fig.1c illustrates the wave action and its effect on beaches after implementing
the system for preventing beach erosion, according to an embodiment of the present
invention herein;
[00026] Fig.2 illustrates the method for preventing beach erosion, according to an
embodiment herein;

[00027] Fig.3a illustrates the Draincrete slab manufactured using the formwork,
according to an exemplary embodiment herein;
[00028] Fig.3b illustrates the cross section of anchor plates or tiles anchored on the
anchor rods, according to an embodiment herein;
[00029] Fig.3c illustrates the anchor plates or tiles attached to the anchor rods,
according to an exemplary embodiment herein;
[00030] Fig.3d illustrates the Draincrete slab laid on geotextile, according to an
exemplary embodiment herein;
[00031] Fig.3e illustrates a plan of a system implemented for preventing beach erosion,
according to an exemplary embodiment herein;
[00032] Fig.3f illustrates a cross section at AA’ of the plan of a system implemented
for preventing beach erosion, according to an exemplary embodiment herein;
[00033] Fig.3g illustrates a cross section at BB’ of the plan of a system implemented
for preventing beach erosion, according to an exemplary embodiment herein;
[00034] Fig.3h illustrates the system implemented on the beach for preventing beach
erosion, according to an exemplary embodiment herein;
[00035] Fig. 4 illustrates the accretion of sand on the Draincrete slabs, according to an
exemplary embodiment herein;
[00036] Fig. 5 illustrates the setup after implementation, according to an exemplary
embodiment herein; and
[00037] Fig. 6 illustrates the wave action on slabs, according to an exemplary
embodiment herein.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[00038] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments and detailed in the following description. Descriptions of well-known components and processing techniques are omitted to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of

ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[00039] As mentioned above, there is a need for a system and a method for preventing beach erosion using a special type Draincrete Underlain by Poly-Filter (DUPF) that rectifies the drawbacks of the prior arts. The embodiments herein achieve this by providing a system and a method for preventing beach erosion using a special type Draincrete (or pervious concrete) Underlain by Poly-Filter or geotextile (DUPF). Further, the invention provides a method for manufacturing the special type of Draincrete slabs using cementitious material. Referring now to the drawings, and more particularly to FIGS. 1 through 6, where similar reference characters denote corresponding features consistently throughout the figures, there are shown preferred embodiments.
[00040] According to an embodiment, a system is developed to provide a hard porous surface on the beach and the slope leading to the banks, and they are laid in such a way that the waves when acting on them may not get reflected to take the sand seawards. It is to be ensured that the waves always enter them tangentially. The hard surface can be of sufficient abrasive resistance to withstand the shear force of waves at the bottom. Also, the hard surface able to support the weight of water above without collapse. It is found that porous concrete blocks can be made to form such an armor. The porous concrete blocks (herein after Draincrete slabs) are to be underlain by a polypropylene geo-filter to i) allow quick drainage, ii) dissipate undue pore pressure underneath, iii) prevent movement and escape of sand upwards through the porous blocks. In addition, it serves the purpose of the spacing of the blocks to a small extent. [00041] Fig.1a illustrates the wave action and its effect on beaches before shore erosion 100a, according to the prior art. Understanding the waves action on the beach and the characteristics of the beach profile produced as a result of wave action is necessary to analyze the rate of beach erosion. The results obtained from the observation of the waves show that, the beach profile length, the beach slope and the limit of run up are

dependent on the intensity of the wave and the wave height. Considering Fig. 1a which shows the wave action and its effect on beaches. Here in Fig. 1a shows the profile of beach before disintegration as profile1. The profile 1 shows the status of beach side 101 and sea side 102 sand level.
[00042] Fig.1b illustrates the wave action and its effect on beaches after shore erosion 100b, according to the prior art. The condition of the shore after erosion is illustrated as Profile 2 in fig.1b. The profile 2 shows the eroded sand 103 by the sea waves. [00043] Fig.1c illustrates the wave action and its effect on beaches after implementing the system 100c for preventing beach erosion, according to an embodiment of the present invention. Fig. 1c shows profile 3 portrays the execution of the proposed thought. In the proposed model, the waves are made to tangentially enter the revetment without direct impact and go up to the natural run-up. Turbulence in the breaking wave and friction accounts for reducing the kinetic energy of the incoming wave. The revetment provided was designed to resist the bottom shear of the waves, while it moves along the slope. The profile 3 shows the side view of the position of geotextile sheet 104, Draincrete slab 105, point of maximum run up 106 and accretion of sand 107 over the slab.
[00044] Fig.2 illustrates the method 200 for preventing beach erosion, according to an embodiment. the method for preventing beach erosion comprising the steps of, [00045] at block 201, before paving the Draincrete slabs 302, a layer of geotextile sheet that covers both a sea side and landward side area of the beach is buried in the beach, [00046] at block 202, after burying the geotextile sheet, a layer of one or two Draincrete slabs 302 on a sea side is buried under the sand over the geotextile sheet, [00047] at block 203, the Draincrete slabs 302 are placed on the beach profile gradually,
[00048] at block 204, the pavement of Draincrete slabs 302 over the geotextile sheet is continued to a landward side,

[00049] at block 205, either the slabs at the sides are buried under enough of sand or
terminating on an abutment, binding adjacent blocks or slabs using stainless steel
cables or steel strips,
[00050] at block 206, some of the inward placed Draincrete slabs 302 are anchored
using a threaded stainless-steel anchor rod,
[00051] at block 207, a plate is attached with the threaded stainless-steel anchor rod
using washer and nuts at bottom of the plates,
[00052] at block 208, the steel rod is made to pass through the geotextile and the hole
in the Draincrete slab 302 and fixing by means of washer and nuts, and
[00053] at block 209, a support is provided to beach sand by allow sea waves to enter
the Draincrete slabs 302 laid over the geotextile tangentially.
EXPERIMENTAL RESULTS:
[00054] Fig.3a illustrates the Draincrete slab manufactured 300a using the formwork, according to an exemplary embodiment. The Pervious concrete slabs 302 or Draincrete slabs 302 are cast with cement, coarse aggregate, mineral admixtures and water, in the absence of fine aggregate, with a predetermined water-cement ratio (for example ranging from 0.27 to 0.3). For example, two hundred slabs of dimensions 0.5m x 0.5m x 0.1m were cast for an area of 5m x 10m as shown in Fig.3a. Fifty slabs which are set at the edges of the grid were provided with 8mm standard anchor rods 304. Anchor rods 304 were attached to a supporting tile of dimension 0.15m x 0.15m x 0.02m, which can be underlain and buried after excavating the outer edges underneath the edge slabs. The edge slabs were provided with a slanting design at the outer edges. This design was used to ensure that the wave turbulence is avoided and thus the stability and durability against overturning and scouring of the slabs are ensured. Wave turbulence is caused due to the eddy currents produced due to impact of the waves on the slabs at the edges, especially the seaside end as they are directly facing the waves. For example, provisions for accommodating stainless steel strips of 0.003m thickness and 0.05m width were provided in the middle portion of inner slabs. Initially, the casting of the

Draincrete is performed using a formwork 301. Before curing the formwork is removed from the Draincrete slab 302.
[00055] According to an embodiment, the pervious concrete blocks are cast and kept for a curing period of 28 days. The curing is done by immersing the cast slabs completely in a curing tank to avoid any chances of developing a shrinkage crack. The Draincrete slabs 302 are tested for their strength and permeability properties after the abovementioned curing period. A detailed study on strength, permeability and durability properties of pervious concrete was conducted prior to the casting. The improved and expected properties of the Draincrete slabs over normal concrete slabs are higher compressive strength and density to prevent breakage due to wave impact, a coefficient of permeability higher than that of the in-situ beach soil, improved durability and wear resistance against sea water attack.
[00056] According to an embodiment, after 28 days of curing, the slabs were transported to the site. Excavation for anchor and creating the required gradient is planned to be done manually. Based on survey data, the excavation for anchorage is fixed to a predetermined depth (for example 0.3m to 0.7m) at the seaside end of the structure.
[00057] Fig.3b illustrates the anchor plates or tiles anchored on the anchor rods 300b, according to an embodiment. According to an embodiment, anchor rods 304 of standard predetermined diameter and length (for example, 8mm diameter and 0.5m length) which are made of stainless steel (SS 404) is used for anchor the end slabs, thus ensuring its stability and to avoid overturning of the concrete blocks. For example, stainless steel of grade 404 is used, as they have high tensile strength and excellent corrosion resistance owing to presence of copper and chromium in its composition. Fixities and fasteners of standard size and same material are attached with the anchor rods 304 to increase its stability.
[00058] According to an embodiment, the anchor rods 304 can be attached to the basement with a supporting anchor tile 305 of dimension for example 0.15m x 0.15m x 0.02m. The connection between the anchorage and anchor tile 305 is done using

washers and nuts of standard dimensions. The anchor tile 305 is attached to the anchor rods 304 using washer 309 and nuts 310. Similarly, the Draincrete slab 302 is attached to the anchor rods 304 using washer 307 and nuts 308.
[00059] Fig.3c illustrates the anchor plates or tiles anchored on the anchor rods 300c, according to an exemplary embodiment. The Fig. 3c shows the anchor tiles fitted on anchor rods 304 at site during implementation.
[00060] Fig.3d illustrates the Draincrete slab laid on geotextile 300d, according to an exemplary embodiment. After excavating the required outer edges, anchor rods 304 with anchor tiles fixed are inserted into the excavated region. The soil was backfilled with the anchor rods 304 protruding from the surface. The slabs 302 designed for the edges were chosen and fixed on the protruding anchor rods 304 through the hole provided in the center of the slabs 302. This process is done before keeping the geotextile sheet to make sure that the slabs once fixed, may be at the same level as that of the existing beach. Once the slabs are placed at the edges and the gradient checked, the slabs were removed and the geotextile layer 303 was laid along the area by inserting it through the protruding anchor rods 304. After laying the geotextile layer, slabs are placed over this as shown in Fig. 3b.
[00061] Fig.3e illustrates a plan 300e of a system implemented for preventing beach erosion, according to an exemplary embodiment. The plan of a system implemented for preventing beach erosion includes for example fifty-six slabs which are set at the edges of the grid were provided with 8mm standard anchor rods 304 for ensuring the stability. The slope was maintained with respect to the gradient fixed according to a diurnal variation of the beach. After laying the five rows from the beachside end, special care may be taken to place the front five rows of slabs such that it may be kept on the designed slope and embedded towards the seaside end.
[00062] According to an exemplary embodiment, the stainless-steel strips of predetermined thickness and width (for example 0.003m thickness and 0.05m width) can be welded and used to brace and hold the inner slabs against overturning. The ends of the strips are fixed to the anchored slabs on the outer edges in each row.

[00063] Fig.3f illustrates a cross section at AA’ 300f of the plan of a system implemented for preventing beach erosion, according to an exemplary embodiment. According to an embodiment, the cross section at AA’ of the plan of a system implemented for preventing beach erosion shows the cross section at the portion where the stainless steel strip attached to the Draincrete slabs 302.
[00064] Fig.3g illustrates a cross section at BB’ 300g of the plan of a system implemented for preventing beach erosion, according to an exemplary embodiment. According to an embodiment, the cross section at BB’ of the plan of a system implemented for preventing beach erosion shows the cross section at the portion where the anchor rods 304 are attached to the anchor tiles and Draincrete slabs 302. [00065] Fig.3h illustrates the system implemented on the beach for preventing beach erosion 300h, according to an exemplary embodiment. The completed setup can be observed in Fig.3h.
RESULTS AND DISCUSSIONS:
[00066] Fig. 4 illustrates the accretion of sand 400 on Draincrete slabs 302 at only one
side of the revetment, where sea waves acted on the pavement in an oblique direction.
This was because the pavement is made only for a small strip of area 5m x 10m, not
extending to the whole width of the beach, and the wave entry was deflected due to a
nearby breakwater structure.
[00067] Fig. 5 illustrates the setup after implementation 500, according to an
exemplary embodiment herein. The Draincrete slabs are laid on a steeper slope towards
the seaside so that the last few rows of slabs were buried in the beach. It is found that
the frontal waves rode smoothly on the slope and then later recede without creating any
damage to the set up.
[00068] Fig. 6 illustrates the wave action on slabs 600, according to an exemplary
embodiment herein. The waves can be found entering the slope here tangentially from
the front. After going up the slope on the revetment to some height, the waves receded.

The protection was extended only for a small width of 5m for the testing and the scour
near the side slabs could not be prevented. We can conclude that the proposed idea can
effectively prevent the beach erosion and thus can protect the beach sand efficiently,
provided, the edges are embedded in sand or terminated on an abutment or wall.
Ample accretion may occur in due course and the setup may get embedded get merged
with the beach profile.
[00069] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

We Claim:
1. A system for preventing beach erosion, wherein the system comprises of a
plurality of Draincrete slabs 302, a plurality of geotextile sheets 303, a plurality
of a stainless-steel cables, wires/ strips 306, a plurality of anchor rods 304, a
plurality of anchor plate 305;
wherein the Draincrete slabs 302 laid over the geotextile sheets 303 to create a
revetment in such a way to allow sea waves to enter the slabs tangentially;
wherein the Draincrete slabs 302 laid over the geotextile sheets 303 at the edges
are anchored using anchor rods 304 and anchor plates 305;
wherein the anchor rods 304 are attached in the anchor plate 305 using washers
307 and nuts 308;
wherein the anchor rods 304 are attached in the Draincrete slab 302 using
washers 309 and nuts 310; and
wherein the anchor plate 305 along with the anchor rods 304 buried deep in
sand at a predetermined interval and a rod is made to pass through the geotextile
303 and Draincrete slab 302.
2. The system of claim 1, wherein the anchor plate 305 includes a concrete anchor plate or a metal tile.
3. The system of claim 1, wherein the adjacent Draincrete slabs 302 laid over the geotextile sheets 303 are bound to each other using strips or cables or wires passing over or through the slabs and bolting or welding them together; and wherein flexibility of movement of slabs is allowed with a predefined distance to prevent displacement/overturning of the slabs.

4. The system of claim 1, wherein a play of predetermined distance is allowed between the Draincrete slabs 302 thereby to provide enough flexibility for a pavement lay over the beach.
5. The system of claim 1, wherein if sides of the revetment does not terminate on an abutment then the Draincrete slabs 302 towards the end are to be buried deeper in the sand and anchored; and wherein a gradual gradient provided to the exposed pavement inwardly for safety.
6. The system of claim 1, wherein the stainless-steel cables or strips 306 that are connected to the Draincrete slabs 302 with allowable flexibility thereby to enable slight adjustment and movement in the Draincrete slabs 302.
7. The system of claim 1, wherein the pavement of Draincrete slabs 302 performed after excavation of a site of the beach and required gradient for the revetment designed based on the site.
8. A method for manufacturing Draincrete slab to prevent beach erosion as claimed in claim 1, wherein the method for manufacturing Draincrete slab 302 comprising the steps of,
casting the Draincrete slabs 302 with cement, coarse aggregate, mineral
admixture and water, in the absence of fine aggregate, with a water-cement ratio
ranging from 0.27 to 0.3;
attaching anchor rods 304 to an anchor plate 305 of predetermined dimension
underlain and buried to a predetermined depth after excavating the outer edges
underneath the edge Draincrete slabs 302;
providing a slanting design at the outer edges of the edge Draincrete slabs 302,
and

providing provisions for accommodating stainless-steel strips 306 or wires or cables of predetermined thickness and width to hold in place the inner slabs against displacement or overturning.
9. A method for preventing beach erosion comprising the steps of,
burying a layer of geotextile sheet that covers both the sea side and landward
side area of the beach;
burying a layer of one or two Draincrete slabs 302 towards the sea side under
the sand over the geotextile sheet;
keeping up with the beach profile gradually;
continuing the pavement of Draincrete slabs 302 over the geotextile sheet to a
landward side for 2 to 3 meters above the possible expected run-up of sea
waves;
either burying the slabs towards the sides under enough of sand or terminating
on an abutment, binding adjacent blocks or slabs 302 using stainless steel
cables, wires or steel strips 306;
anchoring of the edge Draincrete slabs 302 using a threaded stainless-steel
anchor rod 304;
attaching an anchor plate 305 with the threaded stainless-steel anchor rod 304
using washer 307 and nuts 308 at bottom of the anchor plates 305;
making the steel rod 304 to pass through the geotextile 303 and the hole in the
Draincrete slab 302 and fixing by means of washer 309 and nuts 310; and
providing support to beach sand by allowing sea waves to enter the Draincrete
slabs 302 laid over the geotextile 303 tangentially.
10. The method of claim 9, wherein the method for preventing beach erosion
further comprising the steps of, anchor the Draincrete slabs 302 lay over the

geotextile sheet 303 at predetermined intervals by providing anchor rods 304 with anchor plates 305 buried deep in the sand.