JP2014114564A - Rainwater storage and water utilization system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rainwater storage and water utilization system capable of obtaining water utilization excellent in water quality.SOLUTION: In a rainwater storage and water utilization system: a rainwater inflow port 42a, a rainwater outflow suppressing tank communication port 43b communicating with a rainwater outflow suppressing tank 20A, and a water utilization tank communication port 42b communicating with a water utilization tank 30 are provided in a vertical pipe 40; the mutual relative heights of respective lower ends of the rainwater inflow port 42a, the rainwater outflow suppressing tank communication port 43b, and the water utilization tank communication port 42b in the vertical pipe 40 are set so as to be the heights of the rainwater outflow suppressing tank communication port 43b, the water utilization tank communication port 42b, and the rainwater inflow port 42a in order from the lowest height; and when the rainwater outflow suppressing tank 20A is brought into a state of exceeding a water reserving limit after rainwater flowing into the vertical pipe 40 through the rainwater inflow port 42a is guided to the rainwater outflow suppressing tank 20A, the rainwater flowing into the vertical pipe 40 begins to be introduced to the water utilization tank 30.

Description

  The present invention relates to a rainwater storage water utilization system provided with a water utilization tank capable of storing rainwater for water utilization.

  Conventionally, the facilities provided with the tank which can store rainwater are already disclosed (for example, refer patent documents 1 and 2).

  In the configuration disclosed in Patent Document 1, the permeation tank and the storage tank are connected via the flow path switching unit, and the initial rainwater that has flowed is first guided to the storage tank, and when the storage amount becomes constant, Subsequent rainwater is guided to the permeation tank by the flow path switching means.

  Moreover, the structure disclosed by patent document 2 is equipped with the management tank connected to a storage tank and a permeation tank. And it is the structure which rainwater flows into a storage tank preferentially through this management tank first. In addition, a sand settling part for separating earth and sand and solid waste contained in rainwater is formed in the management dredger.

Japanese Patent Laying-Open No. 2005-048509 JP 2011-247024 A

  However, the configuration according to Patent Document 1 has a problem that foreign matter such as sand mud accumulated at the bottom of the storage tank or infiltration tank is included in the water supply. Furthermore, since it is necessary to manufacture the flow path switching means exclusively for installation sites having different conditions, there is also a problem of lack of versatility.

  The configuration according to Patent Document 2 also has a problem in the quality of stored rainwater because it cannot sufficiently remove small solids such as suspension contained in rainwater flowing into the storage tank.

  Therefore, an object of the present invention is to provide a rainwater storage water utilization system that includes a water tank and can appropriately remove sand mud and the like that cannot be removed by a filter included in rainwater and store rainwater as use water.

  The present invention is a rainwater storage water utilization system equipped with a water tank that can store rainwater for water use, and it can temporarily store rainwater and can control the rainwater outflow that can be drained to a drainage destination. A tank, and a vertical pipe provided with a rainwater inflow port on the pipe wall, and further, on the pipe wall of the vertical pipe, a rainwater outflow suppression tank communication port communicating with the rainwater outflow suppression tank, and the water tank A irrigation tank communication port that communicates with each other, and the relative heights of the rainwater inlet, the rainwater outflow suppression tank communication port, and the lower ends of the water tank communication port in the vertical pipe are The rainwater outflow control tank communication port, the water tank connection port, and the rainwater inflow port are set in order from the lowest, and the rainwater flowing into the vertical pipe through the rainwater inflow port is the rainwater. The rainwater outflow suppression tank is guided to the rainwater outflow suppression tank through the outflow suppression tank communication port. When a state exceeding the storage limit, rainwater that has flowed into the upstanding tube is a rainwater storage water utilization system, characterized in that begins to be introduced into the utilization water tank via said gain aquarium communication port.

  In the above configuration, since the lower end of the water tank connection port is disposed at a position relatively higher than the lower end of the rainwater outflow suppression tank communication port, in normal times, the rainwater flowing into the vertical pipe is first the rainwater. It flows into the outflow suppression tank preferentially and is drained from the rainwater outflow suppression tank to the drainage destination. On the other hand, when the flow rate of rainwater flowing into the vertical pipe increases due to heavy rain or heavy rain, and the rainwater outflow suppression tank reaches the storage limit, the water level in the vertical pipe rises accordingly. Then, when the water level reaches the water tank connection port, rainwater in the vertical pipe starts to be introduced into the water tank. Here, the rainwater in the vertical pipe is accumulated in the vertical pipe for a while in the process in which the water level in the vertical pipe rises, and a time for sedimentation of sand mud and the like contained in the rainwater is obtained. For this reason, most of the rainwater introduced into the water tank is a relatively good water quality supernatant from which sand mud and the like have been removed. For this reason, this rainwater storage water utilization system has the advantage that water with relatively good water quality can be obtained. In addition, even if the rainwater outflow suppression tank reaches the storage limit, the above configuration can further allow rainwater for the volume of the water supply tank and the remaining volume of the standpipe, so that the entire system is less likely to overflow. There is. In addition, since the lower end of the rainwater inlet in the vertical pipe is arranged at a position relatively higher than the lower end of the water tank connecting port, the water level in the vertical pipe rises and rainwater is introduced into the water tank Even so, the rainwater is prevented from flowing back to the upstream side through the rainwater inlet.

  The rainwater outflow suppression tank may be a permeation tank capable of temporarily storing rainwater and allowing the rainwater to penetrate into the ground, which is a drainage destination, or temporarily storing rainwater, and temporarily storing the rainwater as a drainage destination. The storage tank which can drain to a discharge pipe may be sufficient.

  When the rainwater outflow suppression tank is a storage tank, a rainwater discharge port having a lower end set at a position lower than a lower end of the rainwater outflow suppression tank communication port is provided on a pipe wall of the vertical pipe, and the rainwater discharge port The vertical pipe is connected to a rainwater discharge pipe through which rainwater is discharged, and the rainwater that flows into the vertical pipe is first discharged to the rainwater discharge pipe through the rainwater discharge port. Thus, a configuration is proposed in which the rainwater discharge port in the vertical pipe is provided with a flow rate suppressing means for suppressing the flow rate of rainwater flowing into the rainwater discharge pipe.

  In the above-described configuration, the rainwater that has flowed into the vertical pipe flows down through the vertical pipe and first goes to the rainwater discharge port. Since the flow rate suppressing means is disposed at the rainwater discharge port, the rainwater There occurs a state in which rainwater that cannot be discharged at the discharge port stays in the vertical pipe. Then, when the amount of the accumulated rainwater increases and the water level reaches the rainwater outflow suppression tank communication port, the rainwater starts to be introduced into the rainwater outflow suppression tank, that is, the storage tank. That is, by providing the flow rate suppressing means, it is possible to introduce rainwater that has flowed into the vertical pipe into the rainwater outflow suppression tank while discharging it into the rainwater discharge pipe. In addition, since the flow rate of rainwater discharged from the rainwater discharge port is suppressed in this manner, rainwater is easily collected in the vertical pipe, and rainwater can be suitably introduced into the water tank. When the rainwater outflow suppression tank is an infiltration tank, rainwater is gradually discharged from the infiltration tank to the ground, and excess rainwater is accumulated in the infiltration tank.

  Further, it is desirable that a mud reservoir is provided at the lower portion of the vertical pipe.

  In the vertical pipe, as described above, sand mud contained in rain water sinks in the process of the rainwater outflow suppression tank becoming the storage limit and the water level rising, so a mud reservoir is arranged at the lower part of the vertical pipe Thus, the sand mud and the like can be suitably received and stored in one place. Thereby, diffusion of sand mud and the like in the vertical pipe can be prevented, and maintenance work for recovery and disposal of the sand mud and the like is facilitated.

  The vertical pipe is composed of a vertical pipe body and an upper side attached to the upper end of the vertical pipe body, and a lower side attached to the lower end of the vertical pipe body. It is desirable that the rainwater inlet and the water tank connection port are provided, and the rainwater outflow suppression tank communication port is provided on the lower side.

  By adopting the above configuration, since the general-purpose product that has been conventionally used can be applied as it is when the vertical pipe is configured, there is an advantage that the construction cost can be kept low and the construction can be easily performed.

  Further, a configuration is proposed in which the irrigation tank communication port in the vertical pipe is provided with a rainwater inflow direction limiting means for limiting rainwater flowing into the irrigation tank communication port to rainwater accumulated in the vertical pipe. Is done.

  If the irrigation tank communication port is located substantially in front of the rainwater inlet, the rainwater that has flowed vigorously from the rainwater inlet immediately enters the irrigation tank communication port and immediately enters the vertical pipe. In this case, there is a risk that it will not be possible to secure time for sufficient sedimentation of sand and mud. Therefore, by limiting the rainwater that is going to flow into the water tank access port by the rainwater inflow direction limiting means to the rainwater accumulated from below the vertical pipe, the sediment such as sand mud contained in the rainwater is sufficiently settled. It is possible to secure a time to be performed.

  In addition, the present invention is a rainwater storage water utilization system provided with a water tank that can store rainwater for water use, and can store rainwater temporarily and drain the temporarily stored rainwater to a drainage destination. An outflow suppression tank and a first vertical pipe having a rainwater inflow port provided on the pipe wall, and a pipe wall below the rainwater inflow port in the first vertical pipe communicates with the rainwater outflow suppression tank. A first rainwater outflow suppression tank communication port is provided, and a second rainwater outflow suppression tank communication port communicating with the rainwater outflow suppression tank and a water tank connection port communicating with the water supply tank are provided on the pipe wall. Provided with a second vertical pipe, and the relative height of each lower end of the second rainwater outflow suppression tank communication port and the water tank communication port in the second vertical pipe in order from the lowest The second rainwater outflow suppression tank communication port and the water tank communication port are set. Rainwater that has flowed into the first vertical pipe through the rainwater inlet is led to the rainwater outflow suppression tank through the first rainwater outflow suppression tank communication port, and the rainwater outflow suppression tank exceeds the storage limit. In this state, rainwater that has flowed into the second vertical pipe through the second rainwater outflow suppression tank communication port starts to be introduced into the water supply tank through the water tank communication port. It is a water utilization system.

  In the above configuration, in normal times, rainwater that has flowed into the first vertical pipe flows down into the first vertical pipe, flows into the rainwater outflow suppression tank, and sequentially flows from the rainwater outflow suppression tank to the drainage destination. Drained. On the other hand, when the flow rate of rainwater flowing into the first vertical pipe increases due to heavy rain, concentrated heavy rain, and the like, and the rainwater outflow suppression tank reaches the storage limit, the second vertical pipe is added to the second vertical pipe. The water level in the vertical pipe will also rise. Then, when the water level in the second vertical pipe reaches the water tank connection port, rainwater in the second vertical pipe starts to be introduced into the water tank. Here, since the lower end of the water tank connection port is disposed at a position relatively higher than the lower end of the second rainwater outflow suppression tank communication port, most of the rainwater introduced into the water supply tank As the water level in the pipe rises, it becomes a supernatant with relatively good water quality in which sand and mud have settled. For this reason, this rainwater storage water utilization system has the advantage that water with relatively good water quality can be obtained. In addition, even if the rainwater outflow suppression tank reaches the storage limit, it is possible to allow rainwater further from the volume of the water tank and the remaining volume in the first and second vertical pipes. As an advantage, it is difficult to overflow.

  Moreover, in the structure described so far, it is desirable that the water utilization tank is disposed above the rainwater outflow suppression tank.

  By providing the water supply tank above the rainwater outflow suppression tank and juxtaposing both tanks in the vertical direction, both tanks can be disposed even in a narrow space.

  The rainwater storage water utilization system according to the present invention has an excellent effect of introducing rainwater with good water quality into a water utilization tank.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows the rainwater storage water utilization system concerning Example 1. FIG. It is explanatory drawing which shows the flow of the rainwater in a vertical pipe, (a) shows normal time, (b) shows the storage limit time of a rainwater outflow suppression tank, (c) shows the time of rainwater introduction to a water supply tank . Explanatory drawing which shows the rainwater storage water utilization system concerning Example 2. FIG. It is explanatory drawing which shows the flow of the rainwater in a vertical pipe, (a) shows the storage limit time of a rainwater outflow suppression tank, (b) shows the time of rainwater introduction to a water-use tank.

  Hereinafter, the Example which actualized the rainwater storage water utilization system of this invention is described in detail. In addition, this invention is not limited to the Example shown below, A design change is possible suitably.

[Example 1]
As shown in FIG. 1, the rainwater storage water utilization system 1 </ b> A includes a rainwater outflow suppression tank 20 </ b> A composed of a permeation tank that can temporarily store rainwater and permeate it into the ground as a drainage destination, and use rainwater for water utilization. A water tank 30 that can be stored is provided. The water tank 30 is disposed above the rainwater outflow suppression tank 20A, and an inspection port 31 provided on the upper surface of the water tank 30 is arranged on the ground surface. A well-known thing is applied suitably as the infiltration tank and this water-use tank 30 which comprise this rainwater outflow suppression tank 20A.

  The rainwater storage water utilization system 1 </ b> A includes a standpipe 40 that communicates with the rainwater outflow suppression tank 20 </ b> A and the water utilization tank 30. More specifically, the vertical pipe 40 has a straight pipe-shaped vertical pipe body 41 arranged along the vertical direction, an upper side wall 42 attached to the upper end of the vertical pipe main body 41, and the vertical pipe body 41. And a lower box 43 attached to the lower end.

  The upper side 42 is provided with a lid 46 at the upper end, and the upper lid 46 is arranged on the ground surface. By providing the main lid 46, it becomes easy to perform maintenance work in the riser 40 through the main lid 46.

  Further, a rainwater inflow port 42 a is provided on the side wall of the upper side wall 42 (that is, the pipe wall of the vertical pipe 40). Further, a water tank communication port 42b having a lower end set at a position relatively lower than the lower end of the rainwater inlet 42a is provided on the side wall of the upper side 42.

  A pipe end on the downstream side of a rainwater inflow pipe 47 through which rainwater from a building or the like (not shown) flows is connected to the rainwater inlet 42 a in the upper side 42. A rainwater filter 44 having a filter 44a for removing impurities such as dead leaves is disposed upstream of the upper wall 42 in the rainwater inflow pipe 47.

  On the other hand, the upstream side pipe end of the first relay pipe 51 connected to the inlet 32 formed in the water supply tank 30 is connected to the water supply tank communication port 42b in the upper side 42, whereby the vertical pipe The inside of 40 and the inside of the water-use tank 30 communicate. In addition, the other end of the elbow pipe (rainwater inflow direction limiting means) 42c having one pipe end directed downward is connected to the water supply tank communication port 42b in the vertical pipe 40. By connecting the elbow pipe 42c, the direction of the rainwater that is going to flow into the water tank communication port 42b is limited, and the rainwater guided to the water tank 30 is only the rainwater accumulated from below the vertical pipe 40. Limited to That is, if the water tank communication port 42b remains substantially opposite to the rainwater inlet 42a, the rainwater that has flowed from the rainwater inlet 42a immediately immediately enters the water tank communication port 42b. It will enter, and there is a possibility that it will not be possible to secure a time for sufficient sedimentation of sand and mud in the vertical pipe 40. In view of this, the elbow pipe 42c is disposed in the above-described direction so as to secure a certain time for sufficient sedimentation of sand mud or the like contained in rainwater.

  Further, a rainwater outflow suppression tank communication port 43 b is provided on the side wall of the lower side 43 (that is, the pipe wall of the vertical pipe 40). Further, a mud reservoir 45 for accumulating sand mud and the like is formed at the lower portion of the lower casing 43. The mud reservoir 45 is a well-known member such as a removable bucket that is already well known.

  The upstream side pipe end of the second relay pipe 52 connected to the inflow port 21 formed in the rainwater outflow suppression tank 20A is connected to the rainwater outflow suppression tank communication port 43b in the lower side 43. The vertical pipe 40 communicates with the rainwater outflow suppression tank 20A.

  In the above-described configuration, in the normal state, rainwater from which impurities and the like have been removed by the filter 44a of the rainwater filter 44 passes through the rainwater inflow pipe 47 and flows into the vertical pipe 40 through the rainwater inlet 42a. To do. Then, the rainwater flows down in the vertical pipe 40 as shown in FIG. 2a.

  Then, part of the rainwater staying in the lower side 43 starts to be introduced into the rainwater outflow suppression tank 20A via the rainwater outflow suppression tank communication port 43b. Then, the rainwater gradually permeates into the ground from the rainwater outflow suppression tank 20A.

  On the other hand, when the flow rate of rainwater flowing into the vertical pipe 40 increases due to heavy rain or concentrated heavy rain, and the rainwater outflow suppression tank 20A reaches the storage limit, the water level in the vertical pipe 40 is as shown in FIG. 2b. It gradually rises. Then, as shown in FIG. 2 c, when the water level reaches the water tank connection port 42 b of the vertical pipe 40, rainwater in the vertical pipe 40 starts to be introduced into the water supply tank 30.

  Here, most of the rainwater introduced into the water tank 30 is accumulated in the vertical pipe 40 for a while in the process of raising the water level in the vertical pipe 40, and is contained in the rainwater during this period. The sand mud etc. that have been settled. Further, as described above, since the pipe end of the elbow pipe 42c is directed downward, rainwater passes through the water tank connecting port 42b after a certain period of time has passed after being introduced into the vertical pipe 40. And introduced into the water tank 30. For this reason, when rainwater is introduced into the water tank 30, the water quality is relatively good with sand mud and the like removed.

  It should be noted that sand mud or the like that settles in the vertical pipe 40 is sequentially accumulated in the mud reservoir 45 of the lower casing 43, and can be easily recovered during maintenance work of the lower casing 43. Thus, by using a well-known masu as a member constituting the standpipe 40, maintenance work can be facilitated and the construction cost of the standpipe 40 can be kept low.

  By the way, as shown in FIG. 2 etc., the lower end of the rainwater inlet 42a in the said vertical pipe 40 is distribute | arranged to the position relatively higher than the lower end of the said water tank communication port 42b. For this reason, when the water level in the vertical pipe 40 rises and rainwater is introduced into the water use tank 30, the rainwater does not flow back to the upstream side through the rainwater inlet 42a.

  In the rainwater storage water utilization system 1A described above, since the water tank 30 is provided above the rainwater outflow suppression tank 20A and both tanks are juxtaposed in the vertical direction, both tanks are disposed even in a narrow space. be able to. However, a configuration in which the water-saving tank 30 and the rainwater outflow suppression tank 20A are juxtaposed in the lateral direction is also included in the present invention.

[Example 2]
Hereinafter, although the rainwater storage water utilization system 1B of Example 2 is demonstrated according to FIG. 3 etc., description is simplified or abbreviate | omitted about the part which is common in Example 1, and suppose that the same code | symbol is attached | subjected in a figure.

  As shown in FIG. 3, the rainwater storage water utilization system 1 </ b> B includes a first riser 61 and a second riser 62.

  A rainwater inlet 61a, a first rainwater outflow suppression tank communication port 61b, and a rainwater discharge port 43a are provided on the pipe wall of the first vertical pipe 61. Here, the lower end of the rainwater inflow port 61a is set to a position relatively higher than the lower end of the first rainwater outflow suppression tank communication port 61b. In addition, a pipe end on the upstream side of the rainwater discharge pipe 50 for discharging rainwater is connected to the rainwater discharge port 43a. Furthermore, an orifice 43c is connected to the rainwater discharge port 43a as a flow rate suppressing means for suppressing the flow rate of rainwater toward the rainwater discharge pipe 50. In addition, the lower end of the rainwater outflow suppression tank communication port 61b is set at a position relatively higher than the lower end of the rainwater discharge port 43a.

  In addition, the first rainwater outflow suppression tank communication port 61 b and the inflow port 21 formed in the rainwater outflow suppression tank 20 </ b> B constituted by a storage tank are connected via a second relay pipe 52. In addition, it is desirable from the viewpoint of construction cost that the first riser 61 is composed of an upper side, a riser body, and a lower side, like the riser 40 of the first embodiment. The storage tank constituting the rainwater outflow suppression tank 20B can temporarily store rainwater and appropriately drain the temporarily stored rainwater into a rainwater discharge pipe (not shown) as a drain destination. Things can be used.

  A second rainwater outflow suppression tank communication port 64a and a water tank communication port 65a are provided on the pipe wall of the second vertical pipe 62. Here, the lower end of the second rainwater outflow suppression tank communication port 64a is set at a relatively lower height than the lower end of the water tank connection port 65a.

  In addition, the second rainwater outflow suppression tank communication port 64a is connected to the outflow port 22 formed in the rainwater outflow suppression tank 20B through a third relay pipe 66. Further, the water tank communication port 65 a is connected to the inlet 32 of the water tank 30 through a first relay pipe 51. As with the standpipe 40 of the first embodiment, the second standpipe 62 is preferably composed of an upper side 65, a standpipe main body 63, and a lower side stand 64 from the viewpoint of construction cost.

  In the above-described configuration, in the normal case, rainwater that has flowed into the first riser 61 flows down in the first riser 61 as in the first embodiment. Then, rainwater flows into the rainwater discharge pipe 50 through the rainwater discharge port 43 a at the lower end of the first stand pipe 61. Here, as described above, the orifice 43c is attached to the rainwater discharge port 43a, and the flow rate of rainwater toward the rainwater discharge pipe 50 is restricted, so that the rainwater stays at the lower end of the first stand pipe 61. A part of rainwater begins to be introduced into the rainwater outflow suppression tank 20B through the rainwater outflow suppression tank communication port 61b. And rainwater is temporarily stored in this rainwater outflow suppression tank 20B.

  On the other hand, the flow of rainwater flowing into the first vertical pipe 61 increases due to heavy rain, concentrated torrential rain, etc., the rainwater outflow suppression tank 20B reaches the storage limit, and rainwater continuously enters the first vertical pipe 61. If it flows in, as shown to FIG. 4a, the water level in the 2nd vertical pipe 62 will rise in connection with this. Then, as shown in FIG. 4 b, when the water level reaches the water use tank communication port 65 a, rainwater in the second vertical pipe 62 starts to be introduced into the water use tank 30.

  Here, since the lower end of the water supply tank communication port 65a in the second vertical pipe 62 is disposed at a position relatively higher than the lower end of the second rainwater outflow suppression tank communication port 64a, Most of the rainwater introduced has a relatively good water quality due to sedimentation of sand mud and the like contained in the rainwater in the process in which the water level in the second vertical pipe 62 rises. In order to prevent backflow at the rainwater inlet 61a in the first vertical pipe 61, the lower end of the water tank communication port 65a is positioned relatively lower than the lower end of the rainwater inlet 61a in the first vertical pipe 61. It is desirable to set.

  The present invention is not limited to the first and second embodiments described above, and the design can be changed as appropriate. For example, the mud reservoir 45 may not be provided in the vertical pipe 40 or the second vertical pipe 62. In the second embodiment, another member may be employed as the orifice 43c as the flow rate suppressing unit. In the second embodiment, the second riser 62 may be disposed in the first riser 61. In the second embodiment, the first standing pipe 61 is provided with the rainwater discharge port 43a. However, the first standing pipe 61 may be provided in the second standing pipe 62, or may be provided in both the standing pipes 61 and 62. May be. Moreover, in Example 2, the rainwater outflow suppression tank 20B may be a rainwater outflow suppression tank 20A configured by an infiltration tank, and in Example 1, the rainwater outflow suppression tank 20A is configured by a storage tank. Of course, it may be the rainwater outflow suppression tank 20B.

1A, 1B Rainwater storage seepage water utilization system 20A Rainwater outflow suppression tank (osmosis tank)
20B Rainwater outflow suppression tank (storage tank)
30 Water tank 40 Vertical pipe 41 Vertical pipe main body 42 Upper side 42a, 61a Rain water inlet 42b, 65a Water tank communication port 42c Elbow pipe (Rain water inflow direction limiting means)
43 Lower side 43a Rainwater discharge port 43b Rainwater outflow suppression tank communication port 43c Orifice (flow rate suppression means)
45 Mud reservoir 50 Rainwater discharge pipe 61 First vertical pipe 61b First rainwater outflow suppression tank communication port 62 Second vertical pipe 64a Second rainwater outflow suppression tank communication port

Claims (9)

A rainwater storage water utilization system comprising a water tank that can store rainwater for water use,
A rainwater outflow control tank capable of temporarily storing rainwater and draining the temporarily stored rainwater to a drainage destination;
A rain pipe with a rainwater inlet provided on the pipe wall,
Furthermore, the pipe wall of the vertical pipe is provided with a rainwater outflow suppression tank communication port communicating with the rainwater outflow suppression tank, and a water supply tank communication port communicating with the water supply tank,
The rainwater outflow suppression tank communication port in the vertical pipe, the rainwater outflow suppression tank communication port, and the relative height of each lower end of the water tank connection port in order from the lowest, the rainwater outflow suppression tank communication port, It is set to be the water tank access port and the rainwater inflow port,
When rainwater flowing into the vertical pipe through the rainwater inlet is led to the rainwater outflow suppression tank through the rainwater outflow suppression tank communication port, and when the rainwater outflow suppression tank exceeds the storage limit, A rainwater storage water utilization system, wherein rainwater flowing into a vertical pipe starts to be introduced into the water utilization tank through the water tank connection port.   The rainwater storage water utilization system according to claim 1, wherein the rainwater outflow suppression tank is an infiltration tank that can temporarily store rainwater and allow the rainwater to permeate into the ground as a drainage destination.   The rainwater storage water utilization system according to claim 1, wherein the rainwater outflow suppression tank is a storage tank that can temporarily store rainwater and drain the temporarily stored rainwater to a rainwater discharge pipe that is a drainage destination. A rainwater discharge port having a lower end set at a position lower than a lower end of the rainwater outflow suppression tank communication port is provided on a pipe wall of the vertical pipe, and the vertical pipe and rainwater are discharged through the rainwater discharge port. A rainwater discharge pipe is connected, and rainwater flowing into the vertical pipe is first discharged to the rainwater discharge pipe through the rainwater discharge port,
The rainwater storage water utilization system according to claim 3, wherein a flow rate suppressing means for suppressing a flow rate of rainwater flowing into the rainwater discharge pipe is disposed at the rainwater discharge port in the vertical pipe.   The rainwater storage water utilization system according to any one of claims 1 to 4, wherein a mud reservoir is provided at a lower portion of the vertical pipe. The vertical pipe consists of a vertical pipe body, an upper side attached to the upper end of the vertical pipe body, and a lower side attached to the lower end of the vertical pipe body,
In the upper side, the rainwater inlet and the water tank communication port are provided,
The rainwater storage water utilization system according to any one of claims 1 to 5, wherein the rainwater outflow suppression tank communication port is provided on the lower side.   The rainwater inflow direction limiting means for limiting rainwater flowing into the water supply tank communication port to rainwater accumulated in the vertical pipe is provided in the water tank connection port in the vertical pipe. Item 7. The rainwater storage water utilization system according to any one of items 6. A rainwater storage water utilization system comprising a water tank that can store rainwater for water use,
A rainwater outflow control tank capable of temporarily storing rainwater and draining the temporarily stored rainwater to a drainage destination;
A first vertical pipe having a rainwater inlet provided on the pipe wall;
Furthermore, a first rainwater outflow suppression tank communication port communicating with the rainwater outflow suppression tank is provided on a pipe wall below the rainwater inlet in the first vertical pipe,
Furthermore, the second rainwater outflow suppression tank communication port communicating with the rainwater outflow suppression tank, and a second water pipe provided with a water tank connection port communicating with the water supply tank provided on the pipe wall,
The second rainwater outflow suppression tank communication port in the second vertical pipe and the second rainwater outflow suppression tank communication port in order from the lowest relative height of each lower end of the water tank communication port , It is set to be the water tank communication port,
Rainwater flowing into the first vertical pipe through the rainwater inlet is led to the rainwater outflow suppression tank through the first rainwater outflow suppression tank communication port, and the rainwater outflow suppression tank exceeds the storage limit. When it becomes a state, rainwater flowing into the second vertical pipe through the second rainwater outflow suppression tank communication port starts to be introduced into the water tank through the water tank communication port. system. The rainwater storage water utilization system according to any one of claims 1 to 8, wherein the water supply tank is disposed above the rainwater outflow suppression tank.

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