JP2006077493A - Laying structure of permeating water storage basin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laying structure of a permeating water storage basin having the permeating and water storage function in a rainwater basin itself, without installing the water storage function around the basin. <P>SOLUTION: This permeating water storage basin 100 formed by arranging a bottom surface opening part 12 in a part or the whole of a basin body bottom surface 11, is arranged in an excavated road surface hole. A permeating water storage member 50 having rainwater permeability and rain water storage performance of a specific quantity, is embedded in the bottom surface opening part 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a structure for laying a drainage basin such as a rainwater basin installed in the middle of a gutter for flowing rainwater on a road, and in particular has a water collection function and a water storage function and has a function of penetrating into the ground. It also relates to the laying structure of the seepage reservoir.

  Traditionally, most of the rainwater penetrated into the ground, penetrated underground, and flowed into rivers and groundwater. Since the soil in the ground has a water storage function, it gradually permeates as groundwater over time and gradually flows into the river. Therefore, in the past, the amount of groundwater and river water was kept stable. However, as the surface of the ground has been paved by recent urban development, rainwater has often flowed directly into rivers through drainage facilities such as ditches. In other words, rainwater flows on the road and is collected in the gutter, and then flows from the gutter to the river at a high speed through the drainage pipe through the catchment. As a result, the underground water storage function was deprived, groundwater decreased, and the normal amount of water flowed down the river. In extreme cases, even areas where the river water level is completely lost are beginning to appear. On the other hand, when heavy rain falls, a large amount of rainwater flows into the river all at once without penetrating into the ground, so the amount of water in the river increases rapidly in a short period of time, and the water level tends to rise rapidly. ing. In view of the above circumstances, there is a need for a drainage facility that can temporarily store rainwater that has fallen on a paved road and, as a result, penetrate into the ground.

  Therefore, a rainwater infiltration trough has been developed that has a permeation function for collecting water from which rainwater is collected so that rainwater can penetrate into the ground. For example, in a rainwater infiltration trough comprising a rectangular tube-shaped main body 4 having a porous wall surface as shown in FIG. 13 and a lid body 5 that closes the upper end opening of the main body 4, the rectangular tube-shaped main body 4 is the rectangular shape. There has been proposed a rainwater infiltration trough configured by abutting a plate-like block 1 having a shape divided into four on a diagonal plane including an axis of a cylinder.

  The laying structure of the rainwater infiltration basin will be described briefly. Excavation holes are excavated in the rainwater basin as shown in FIG. 14, and the permeable sheet 31 cut in accordance with the size of the digging hole 30 is provided around the excavation hole. Then, the crushed stone 32 is thrown into the lower part of the excavation hole 30. On top of that, install a rainwater infiltration tank. And the crushed stone 36 is thrown into the gap | interval of the main body of the installed rainwater infiltration trough, and the said water-permeable sheet 31, a gap | interval is filled up, and the surface layer is leveled finally (refer patent document 1 above).

  Further, as shown in FIG. 15, a rainwater infiltration trough 20 is provided in a distribution pipe for flowing rainwater 55 and permeates rainwater into the ground, and a plurality of first through holes 26 are provided in the wall surface portion 25. Formed so that a lid body 29 is formed and a lid 28 is attached to the upper opening 27, and is provided so as to surround at least a cylindrical portion of the wall surface portion of the rod body, and a space 30 is formed around the wall surface portion. And a rainwater infiltration rod provided with a space forming member 32 having a plurality of second through-holes 31 and a water-permeable sheet material 34 that surrounds the space forming member and allows rainwater to pass therethrough. It is disclosed.

  In this rainwater infiltrating rod, a large hole 45 for installing the rainwater infiltrating rod 20 is first dug, and the rainwater infiltrating rod 20 is installed in the hole 45. And after several processes, the laying structure of filling the sand 46 to the predetermined height position B in the space part between the inner surface of the hole 45 and the rainwater infiltration tub 20 is taken (above patent document 2).

Although these conventional catchment basins have a hole or the like formed in the catchment basin to ensure permeability, the water storage function has been obtained by crushed stone and sand buried outside the basin. Therefore, the catchment itself did not have a water storage function. In addition, since the conventional rainwater seepage dredging needs to have a water storage function in the surrounding area, the surrounding area must be filled with a certain gap between crushed stone and earth and sand. However, if it is filled in a state where a certain gap is provided, the strength cannot be ensured, and in practice it is very difficult to lay.
JP-A-11-256664 JP 2000-282554 A

  Therefore, the present invention has been made in view of the above problems, and laying of a seepage storage tank having a seepage and a storage function in a rainwater tank itself without laying a storage function around the fence. To provide a structure.

  In order to solve the above-described problems, the means taken by the invention described in claim 1 is that, in the laying structure of the seepage reservoir 100 installed on the road, the bottom surface 11 of the main body 11 is formed in the excavated road surface hole. A permeated water storage tank 100 having a bottom opening 12 provided in a part or all of the bottom is installed, and a permeated water storage member 50 having rainwater permeability and a certain amount of rainwater storage is embedded in the bottom opening 12. It is set as the laying structure of the seepage reservoir 100 characterized by the above.

  The laying structure of the seepage storage tank 100 described in claim 1 is obtained by adding a rainwater storage function and a seepage function to the rainwater tank itself. Therefore, an infiltration water storage member 50 capable of storing rainwater and penetrating it is embedded in the bottom surface of the main body. Rainwater can be stored and infiltrated at the bottom of the infiltration reservoir 100. In addition, the osmotic reservoir 100 of the present invention does not have a rainwater permeable storage function on the side surface. If rainwater seepage storage function is given to the side surface, it is necessary to embed earth and sand and gravel so that the permeation storage tank 100 also has the penetration storage function. Then, since it is necessary to provide a gap between the buried earth and sand and gravel, the earth and sand cannot be pressed, and the infiltration reservoir can be completely fixed by the earth and sand around the infiltration reservoir 100. Because it will disappear. Therefore, the osmotic reservoir 100 of the present invention has a osmotic function only on the bottom surface side and does not have a osmotic function on the side surface, and is completely solidified without requiring the permeability of the surrounding earth and sand. Therefore, the seepage reservoir 100 can be fixed stably. In addition, the magnitude | size of the bottom face opening part 12 and the thickness of a bottom face which embed | buy the seepage water storage member 50 in the bottom face of the seepage water storage tank 100 are not specifically limited. In order to improve the water storage function, the bottom opening 12 should be made large and the bottom thick.

  Further, according to the second aspect of the present invention, in the laying structure of the seepage reservoir 100 installed on the road, the water hole 41 penetrating from the upper surface to the lower surface is provided in the excavated road surface hole. The first base portion 40 is installed, and the main body 10 having a bottom surface opening portion provided on a part or the whole of the bottom surface is installed on the first base portion 40. 41 or / and a bottom opening, and a permeable water storage member 50 having a rainwater permeability and a certain amount of rainwater storage capacity is embedded in the laying structure of the osmotic water storage tank 100.

  The laying structure of the seepage water storage trough 100 according to claim 2 is such that the first base portion 40 made separately is installed on the bottom surface of the scissors main body 10 according to claim 1. By providing the separate first base portion 40, it is possible to install the base portion of the road surface hole in a larger area than the heel body 10, so that the placement state of the heel body 10 can be stabilized. In addition, by providing the bottom part separately, the first base part 40 having various thicknesses and sizes of water passage holes can be prepared, and the osmotic water storage tank 100 having various osmotic water storage performances can be prepared. Can be produced.

  Further, according to the third aspect of the present invention, in the laying structure of the seepage reservoir 100 installed on the road, a bottom opening is formed in a part or the whole of the bottom surface of the main body 21 in the excavated road surface hole. The lower water storage tank 20 is provided, and the lower water storage tank 20 is provided with an upper water collection tank 30 having a bottom surface opening partly or entirely at the bottom surface of the main body of the main body. A permeable water storage member 50 having a rain water permeability and a certain amount of rain water storage capacity embedded therein is embedded in the permeable water storage tank 100.

  The invention described in claim 3 separates the ridge having a water collecting function and the ridge having a water storage function. That is, the water collecting function is concentrated on the upper water collecting tank 30 and the water storage function is concentrated on the lower water collecting tank 20. The upper drainage basin 30 has the function of a conventional rainwater basin, and is basically different from a conventional basin except that it has a lower water storage basin 20 on the bottom surface and a function of allowing rainwater to permeate there. There is no place. The lower reservoir 20 is embedded with an osmotic water storage member 50 and has a rainwater storage function and an osmosis function. The rainwater collected in the upper water collecting basin 30 is stored in a certain amount by the infiltration water storage member 50 flowed and embedded in the lower water basin 20 and gradually permeates into the ground. Rainwater that cannot permeate is drained through the same overflow pipe provided in the upper catchment. Thus, by installing a storage tank having a water storage and infiltration function in the downward direction, conventionally, a buried object having a water storage and infiltration function had to be installed outside the tank. Since it has such a function, it is not necessary. Of course, it is not excluded to install such buried objects.

  Furthermore, the means taken by the invention described in claim 4 is that the first base portion 40 provided with a water passage hole 41 penetrating from the upper surface to the lower surface is provided below the lower reservoir 20. It is set as the laying structure of the seepage water storage tank 100 of Claim 3 characterized by the above-mentioned.

  In the present invention, the first base portion 40 separately provided on the bottom surface of the lower reservoir 20 is provided. Similarly to the invention according to claim 2, by providing the first base portion 40 as a separate body, the base portion can be placed on the base portion with a larger area than the lower water reservoir 20. It can be stabilized.

  Furthermore, the means taken by the invention described in claim 5 is characterized in that a second base portion 45 for connecting the respective tanks is installed between the lower reservoir 20 and the upper catchment 30. It is set as the laying structure of the seepage water storage tank 100 of Claim 3 or 4.

  The second base portion 45 has a function as a connecting member for the lower reservoir 20 and the upper reservoir 30. By using such a connecting member, the upper water reservoir 30 can be easily placed on the lower water reservoir 20.

  Furthermore, the means taken by the invention described in claim 6 is that the osmotic water storage member 50 is made of porous concrete or single-grain crushed stone. A laying structure. This is a porous concrete or single-grain crushed stone that is inexpensive and has an excellent water storage function as the permeate water storage member 50.

  According to the laying structure of the seepage reservoir according to claim 1, the bottom portion is provided with a bottom opening, and the bottom portion is provided with a water storage function by introducing the seepage reservoir member into the bottom opening. At the same time, it can ensure penetration into the ground. Moreover, since rainwater that permeates into the ground is natural permeation, an appropriate amount of rainwater can be permeated according to the installation location.

  According to the laying structure of the seepage reservoir according to claim 2, by providing the first base portion, the thickness of the first base portion and the size of the opening can be appropriately selected and adapted to the place. It can be set as the installation structure of the osmotic water storage tank which has permeability and water storage.

  According to the laying structure of the seepage water storage tank according to claim 3, the water storage tank having sufficient space equal to or more than that of the conventional water tank is formed in the upper tank, and the lower tank has a sufficient water storage function. A fence can be provided. This eliminates the need to bury the water storage function around the ridge as in the prior art.

  According to the laying structure of the seepage reservoir according to the fourth aspect, the stable seepage reservoir can be laid by providing the first base portion. Moreover, the water storage of a lower part can be adjusted by selecting the thickness of a 1st base part, and the magnitude | size of an opening part.

  According to the laying structure of the seepage water reservoir according to claim 5, by installing the second base portion between the lower water reservoir and the upper water reservoir, the upper water reservoir according to the shape of the second base portion. Can be arranged in various positions. For this reason, it is possible to lay an infiltration reservoir having an upper catchment in an appropriate position according to the installation location.

  According to the laying structure of the seepage water storage tank according to claim 6, by using porous concrete and single-grain crushed stone for the seepage water storage member, an seepage water storage member having a water storage function and a seepage function can be provided easily and inexpensively. be able to.

  The laying structure of the infiltration water storage tank of the present invention is a so-called rainwater tank with a rainwater infiltration function and a water storage function added while ensuring a sufficient rainwater collecting function. There are two types of the present invention, one laid with one fence and one laid with two fences. For the sake of convenience, the former is a single type and the latter is a stacked type.

Example 1
The laying structure of a single type seepage reservoir will be described. FIG. 1 is a partial cross-sectional view showing only the right side of the infiltration reservoir of Example 1 in cross section. FIG. 2 shows a perspective view of the seepage reservoir used in the first embodiment. First, the seepage reservoir 100 will be described. As shown in FIG. 2, the seepage reservoir 100 is formed in a substantially rectangular parallelepiped surrounded by a wall surface, and the upper end has an opening 11 so that a lid can be attached. A square bottom opening 12 is provided to allow rainwater to permeate the bottom.

  Next, a laying structure using the seepage reservoir 100 will be described. First, the seepage reservoir 100 is installed in a road surface hole excavated for laying the seepage reservoir 100. At this time, as shown in FIG. 1, the base portion 110 may be crushed to provide a base portion, or may be placed directly in the ground. Thereafter, the permeated water storage member 50 is embedded in the bottom opening 12. The material of the infiltration water storage member 50 is not particularly limited as long as it is a member that can retain a certain amount of rainwater and has a function of infiltrating and transmitting rainwater. Preferably, porous concrete or single-grain crushed stone is convenient because it has high rainwater permeability and can store a certain amount of rainwater between stones. And after connecting a rainwater pipe and an overflow pipe like a normal rainwater tank, the circumference | surroundings of the seepage water tank 100 are filled with earth and sand, and are completed. In this case, since rainwater does not permeate from the side surface of the seepage reservoir 100, the surrounding earth and sand may be compacted so that the seepage reservoir 100 can be completely fixed.

  According to the laying structure of the seepage storage tank 100 as described above, rainwater is collected into the seepage storage tank 100 via the opening 11 at the upper end or the rainwater pipe, and a certain amount of rainwater is collected by the seepage water storage member 50 provided on the bottom surface. Is stored at one end and gradually drained from the bottom through the infiltration water storage member 50 into the ground.

  This laying structure of the single-type infiltration reservoir 100 is obtained by adding a rainwater infiltration function and a storage function to the bottom portion of a so-called general rainwater tank. The reason why such a function is provided on the bottom surface is that rainwater is collected through a distribution pipe connected to the side surface. Therefore, the permeated water storage member 50 cannot be introduced into the water collecting tank. This is because if the seepage water storage member 50 is buried in the water collecting tank, the water will overflow. Therefore, in the present invention, the bottom surface opening 12 is provided on the bottom surface of the water collecting basin, and the osmotic water storage member 50 having permeability and water storage is introduced into the bottom surface opening 12. The magnitude | size and depth of the bottom face opening part 12 are not specifically limited, It can set according to the required amount of stored water. That is, when it is desired to increase the amount of stored water, a large and deep bottom opening 12 may be provided.

(Example 2)
FIG. 3 shows a partial cross-sectional view of the laying structure of the seepage reservoir 100 in the second embodiment. The main body 10 of the seepage water storage tank 100 according to the second embodiment is formed in a substantially rectangular parallelepiped surrounded by a wall surface, and the upper end has an opening 11 so that a lid can be attached. The bottom surface has a bottom surface opening portion 12 whose entire surface is opened to allow rainwater to permeate.

  As shown in FIG. 4, the first base portion 40 forms a rectangular flat plate and includes a rectangular convex portion 42 at the center, and can be fitted to the bottom surface of the bag main body 10. Furthermore, the water flow hole 41 opened in the center of the convex part is provided.

  After the first base portion 40 is laid on the base portion, the main body 10 and the first base portion 40 formed as described above are placed on the upper surface of the first main portion 40 to form the osmotic reservoir 100 as a whole. . By providing such a separate first base portion 40, it is possible to prepare ones having various thicknesses and ones having water passage holes 41 of various sizes. It can be appropriately selected and used according to the amount of treatment. If the separate first base portion 40 is prepared in this way, a product in which the permeated water storage member 50 is introduced into the water passage hole 41 in advance as in the first base portion of FIG. 5 is prepared. Therefore, the step of embedding the permeated water storage member 50 in the water passage hole 41 at the site can be omitted.

  According to the laying structure of the single type osmotic reservoir 100 thus laid, a certain amount of rainwater is stored in the osmotic water storage member layer provided on the bottom surface, and the rainwater gradually oozes out from the bottom surface portion so that an appropriate amount is stored. Rainwater will penetrate into the ground. Rainwater that could not penetrate at this time will be led to the river through the water pipe as usual.

  Next, the laying structure of the stacked type seepage reservoir will be described.

(Example 3)
FIG. 6 shows a perspective view of the seepage reservoir 100 in the present embodiment. FIG. 7 shows a partial cross-sectional view in which only the right side of the present embodiment is shown in cross section. FIG. 12 shows a use state of the present embodiment. As shown in FIGS. 6 and 7, the stacked type osmotic reservoir 100 includes an upper catchment 30 having the same size as a normal rainwater catch installed above and an upper catchment installed below the catchment. And a lower reservoir 20 made larger than the basin 30. Since the lower reservoir 20 has a rainwater storage function, it has a larger volume than the upper reservoir 30 so that a large amount of rainwater can be stored. The upper catchment basin 30 is formed in a substantially rectangular parallelepiped surrounded by a wall surface as in the first embodiment, and the upper end has an opening 32 so that a lid can be attached. The bottom surface is provided with a bottom opening for allowing rainwater to pass therethrough. The main body 21 of the lower reservoir 20 is also formed in a substantially rectangular parallelepiped surrounded by a wall surface, and a bottom surface opening for allowing rainwater to permeate is provided on the bottom surface.

  A first base portion 40 is provided on the lower surface of the lower water reservoir 20. The 1st base part 40 is formed in plate shape in order to mount the lower water tank 20, and is for fixing the lower water tank 20 stably. The basic shape is the same as that shown in FIG. Further, the first base portion 40 is formed with a convex shape on the upper surface inside so as to follow the inner contour of the lower reservoir 20 as in the first embodiment, and the lower reservoir 20 is mounted on the first base portion 40. When placed, they can be fitted and fixed. A water passage hole 41 penetrating the lower surface and the upper surface is provided in the convex portion of the first base portion 40, and the permeation water storage member 50 is embedded in the water passage hole 41 to have a permeation water storage function. . The first base is not essential, and may be provided integrally on the bottom surface, or the same function may be provided on the bottom surface and the first base portion may be omitted.

  On the other hand, a second base portion 45 is provided between the upper water collecting basin 30 and the lower water basin 20. The second base portion 45 functions as a connecting member for stably placing the upper catchment 30 on the lower reservoir 20. Therefore, as shown in FIG. 8, the lower surface convex portion 46 is provided on the lower surface of the second base portion 45 so as to be fitted with the upper surface opening of the lower water reservoir 20, and the upper water collection is formed on the upper surface of the second base portion 45. The upper surface convex part 47 is provided so that it may fit with the bottom face opening part 23 of the collar 30. Since the upper surface convex portion 47 is formed so that the upper water collecting basin 30 is smaller than the lower water reservoir 20, the upper surface convex portion 47 is provided at an appropriate position and size according to the mounting position. For example, when it is desired to install the upper water collecting tank 30 in the center, as shown in FIG. Further, when it is desired to provide the side portion, the upper surface convex portion 47 is provided from the center to the side as shown in FIG. Furthermore, when it is desired to provide at the corner, the upper surface convex portion 47 is provided at the corner as shown in FIG. The reason why the upper catchment 30 is provided at the sides and corners as described above is that, for example, in FIG. 7, when the sidewalk is a private road, if the upper catchment 30 is provided at the center, the lower catchment 20 It is because it will invade the way. In this case, if it is provided at the side or corner, the upper water collecting basin 30 is provided at the end as shown in FIG. 11, so that the lower water basin 20 can be prevented from entering the private road. Further, a water passage hole 48 is formed inside the second base portion 45 so that rainwater can pass between the upper water collecting basin 30 and the lower water reservoir 20. A filtration member 49 such as an iron plate provided with a wire mesh or a fine hole is attached to the water passage hole 48 so that the dust mixed with the rainwater collected by the upper water collecting basin 30 does not flow into the lower water basin 20. May be. Note that the second base portion is not necessarily formed separately, and the lower water tank 20 may be integrally formed with the same shape as the second base portion in advance.

  Next, the laying structure of the seepage reservoir 100 using the upper catchment 30, the lower reservoir 20, the first base part 40, and the second base part 45 formed as described above will be described. First, the first base portion 40 is installed in a road surface hole excavated for laying the seepage reservoir 100. At this time, crushed stone may be laid on the foundation as shown in FIG. Then, after installing the lower water tank 20 so that it may fit in the convex part of the 1st base part 40, the osmosis | permeation water storage member 50 is embedded in the lower water tank 20. Then, after installing in the lower water tank 20 so that the lower surface convex part 46 of the 2nd base part 45 and the opening of the lower water tank 20 may fit, the upper water collecting tank 30 is made into the upper surface convex part of the 2nd base part 45. 47 to be fitted. In this way, the seepage reservoir 100 is completed. Thereafter, a rainwater pipe or an overflow pipe is connected to the upper water collecting basin 30 and the periphery of the seepage water storage basin 100 is filled with earth and sand. Also in the third embodiment, as in the first embodiment, the side surface of the seepage reservoir 100 does not affect the permeability of rainwater, and may be completely pressed. A reference diagram showing the installed state is shown in FIG. The first base portion 40 may be omitted and the lower reservoir can be directly installed on the base. Alternatively, the upper reservoir can be installed in the lower reservoir in advance. The two base portions 45 may be omitted.

  According to the laying structure of the seepage storage tank 100 constructed in this way, the upper water collection tank 30 has the same form as that of the conventional rainwater tank, and therefore has the same function of collecting rainwater as in the conventional case. On the other hand, under the upper water collecting tank 30, since it has the lower water tank 20 in which the seepage water storage member 50 is embedded, a large amount of rainwater can be stored as compared with the first embodiment, Excess rainwater can penetrate into the ground from the lower surface of the first base portion 40. Moreover, since rainwater permeates due to natural fall, it can permeate a natural amount of rainwater without causing excessive drainage.

It is a partial cross section figure which shows the laying structure of the seepage water tank concerning Example 1. FIG. 1 is a perspective view of an osmotic reservoir used in the laying structure of an osmotic reservoir according to Example 1. FIG. It is a partial cross section figure which shows the laying structure of the seepage water tank concerning Example 2. FIG. It is a perspective view which shows the 1st base part which is a part of laying structure of the seepage water tank concerning Example 2. FIG. It is the perspective view which embedded the osmosis | permeation water storage member in the 1st base part which is a part of laying structure of the osmosis water storage tank concerning Example 2. FIG. It is a perspective view of the seepage reservoir used for the laying structure of the seepage reservoir according to the third embodiment. It is a partial cross section figure which shows the laying structure of the seepage water tank which concerns on Example 3. FIG. It is a perspective view of the 2nd base part which is a part of laying structure of the seepage reservoir concerning Example 3. FIG. It is a perspective view which shows the modification of the 2nd base part which is a part of laying structure of the seepage water storage tank concerning Example 3. FIG. It is a perspective view which shows the modification of the 2nd base part which is a part of laying structure of the seepage water storage tank concerning Example 3. FIG. It is a perspective view which shows the laying structure using the modification of the 2nd base part which is a part of laying structure of the seepage water tank concerning Example 3. FIG. It is a perspective view which shows the use condition using the laying structure of the seepage water tank which concerns on Example 3. FIG. It is a figure which shows the conventional osmosis | permeation flaw. It is a figure which shows the installation state of the conventional osmosis | permeation basket. It is a figure which shows another reference example of the conventional osmosis | permeation flaw.

Explanation of symbols

100 Permeated Reservoir 11 Opening 20 Lower Reservoir 21 Reed Body 30 Upper Reservoir 40 First Base Portion 41 Water Passing Hole 45 Second Base Portion 50 Permeable Water Storage Member

Claims (6)

In the laying structure of seepage reservoirs installed on the road,
In the excavated road surface hole, install a seepage reservoir with a bottom opening provided in part or all of the bottom surface of the main body,
An osmotic water storage laying structure characterized in that a permeable water storage member having rainwater permeability and a certain amount of rainwater storage capacity is embedded in the bottom opening. In the laying structure of seepage reservoirs installed on the road,
In the excavated road surface hole, a first base part provided with a water passage hole penetrating from the upper surface to the lower surface is installed,
In the first base portion, a heel body having a bottom surface opening provided on a part or the whole of the bottom surface is installed,
An osmotic water storage laying structure, characterized in that a permeable water storage member having rainwater permeability and a certain amount of rainwater water storage is embedded in a water passage hole or / and a bottom opening of the first base portion. In the laying structure of seepage reservoirs installed on the road,
In the excavated road surface hole, install a lower water storage basin with a bottom surface opening partly or entirely on the bottom surface of the main body,
In the lower reservoir, install an upper catchment basin having a bottom surface opening partly or entirely on the bottom surface of the main body,
An osmotic reservoir laying structure characterized in that a permeable reservoir member having rainwater permeability and a certain amount of rainwater reservoir is embedded inside the lower reservoir. The laying structure of the seepage reservoir according to claim 3, wherein a first base portion provided with a water passage hole penetrating from the upper surface to the lower surface is installed below the lower reservoir. The laying structure of the seepage water reservoir according to claim 3 or 4, wherein a second base portion for connecting each of the troughs is installed between the lower reservoir and the upper catchment trough. The osmotic water storage member laying structure according to any one of claims 1 to 5, wherein the osmotic water storage member is made of porous concrete or single-grain crushed stone.

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