JPH11229450A - Water reservation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effect secure and efficient intake of water by excavating an injection well along a water resource and injecting the water in the water resource in an underground aquifer through the injecting well. SOLUTION: A stratum having a high permeability coefficient is detected and injection wells 1 are excavated along an agricultural water channel A to let water flow into the agricultural water channel A throughout the year. Water discharged to the channel A is led to a filter apparatus 7 through an aqueduct 6 to remove dirt and then, infected into the infection wells 1. This water is injected from holes 4 of an injection strainer 5 of a well pipe 3 into an aquifer W. The injected water volume is monitored and measured by a simple device 13 in the infection well 1, and water is continuously infected as long as water does not overflow from a pipe 12 extended to the ground level. In this way, since sufficient water is held in the aquifer W even when spring water Ws is exhausted, water can be appropriately drawn up from a well 21 and used. Accordingly, secure and efficient intake of water can be effected while conserving the natural environment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a water storage method,
In particular, the present invention relates to a water storage method that uses water for domestic use or agricultural use, and contributes to environmental conservation.

[0002]

2. Description of the Related Art For example, in the case of the Sanbongi district in Towada city, Aomori prefecture, rainwater R originally passes through a permeable layer P and accumulates in an aquifer W. Appears as a spring water Ws near the boundary (see FIG. 6). But,
In recent years, since urban areas have been paved with concrete, the penetration of rainwater R into the aquifer W has been reduced, and the appearance of spring water Ws has almost disappeared. For this reason, a pumping well 21 is provided on the site F, and water stored in the aquifer W is stored in the pumping well 2.
At present, it is used as drinking water and the like according to 1. However, the aquifer W may be depleted, and the concept of dam construction is being discussed.

In this area, as shown in FIG. 5 and FIG. 6, there is a difference in elevation in the terrain, an agricultural waterway A is in a high area, and the Oirase River B is flowing in a low area. When the snowmelt water of Mt. Hakkoda increases in the spring, conventionally, the snowmelt water flows into the Oirase River B and flows out to the sea. The rivers were shaved with the movement of snowmelt water and sediment flowed out, causing fish and shellfish that inhabited the downstream sea bays to die.

[0004]

However, such a conventional method has the following disadvantages. First, snowmelt water, which is a source of water, flows out through open rivers, so there is a problem that part of the water evaporates during movement.

[0005] Further, when water is excessively taken from the aquifer W,
There is an adverse effect of causing land subsidence.

[0006] In addition, since the use of the stored water in the depletion period is caused by pump-up, there is a problem that it takes time and cost.

Further, as described above, the outflow of snowmelt water to the sea is accompanied by the outflow of earth and sand, which causes a great loss of fish and shellfish that inhabit downstream sea bays.

[0008] It is an object of the present invention to solve the above-mentioned drawbacks, to ensure reliable and efficient water intake, and to preserve the natural environment. Other objects will be clarified from the following description.

[0009]

In order to achieve the above object, a water storage method according to the present invention excavates an injection well along a water source and injects water from the water source into the underground aquifer through the injection well. It is characterized by the following. Further, in the water storage method according to the first aspect, the injection well is provided on a side or a bottom of the water source. Further, in the water storage method according to claim 1, a hole is provided in a peripheral wall of the pipe of the injection well, and water of a water source introduced into the injection well is injected into the underground aquifer from the pipe hole. I do. In the water storage method according to the first aspect, the injection well is excavated along a water source at a span pitch determined based on a permeability coefficient. Further, in the water storage method according to claim 1,
The injection well is provided in an area where a part of the water in the aquifer appears as a spring. According to a sixth aspect of the present invention, in the water storage method, the injection well is provided along a water source in a high-level area of topography having a height difference.
Further, in the water storage method according to the first aspect, a pumping well communicating with the aquifer is provided separately from the injection well, and water in the aquifer is taken out from the pumping well. Further, in the water storage method according to claim 8, the injection well and the pumping well are provided on a flat ground having an aquifer.

[0010]

Next, a water storage method according to the present invention will be described in more detail with reference to the drawings showing an embodiment.
1 and 2 schematically show the Sanbongi district of Towada City, Aomori Prefecture. A is an agricultural irrigation canal, and B is an Oirase river originating from Lake Towada (not shown). Agricultural irrigation canal A is located in a high area and Oirase river B is present in a low area. The stratum between them is as shown in FIG. 1, and a water permeable layer W made of coarse sand or the like is formed between a water permeable layer P forming the top soil and an impermeable layer N made of clay or the like. On the Oirase River B side between the agricultural irrigation channel A and the Oirase River B, land F such as a paddy field Fr, a field land Fi, and a residential area Fh is formed. H is a groundwater channel of seepage water which communicates with the aquifer W.
release s. The rainwater R passes through the permeable layer P and the aquifer W
, And the lower layer of the aquifer W is stored in the aquifer W because the lower layer is the impermeable layer N.

Reference numeral 1 denotes an injection well drilled along the agricultural water channel A. The injection well 1 is provided along the agricultural waterway A at a span pitch determined based on the hydraulic conductivity (this varies depending on the location, but as a guide, for example, about every 50 m). When setting the injection well 1, first, a water permeability test is performed by test boring. Thereby, the existence of a stratum having a high permeability (that is, the aquifer W) is determined, and the area to which the stratum is connected is clarified. Thereafter, the well pipe 3 is buried in an appropriate place. An injection strainer 5 having a large number of linear holes 4 is provided on the peripheral wall of the well tube 3. The perforated site of the injection strainer 5 is the aquifer W
Is a part corresponding to the position. The injection well 1 is connected to a filter device 7 for removing dust by a water pipe 6, and a control valve 9 for controlling the amount of injected water.
And is connected to the agricultural waterway A by the water injection pipe 11.
A monitoring device 13 composed of a pipe 12 is inserted into the injection well 1 to measure the level of the injected water.

Reference numeral 21 denotes a pumping well provided on the Oirase River B side of the site F, which has been excavated conventionally. The installation of the pumping well 21 is performed by examining the existence of a formation having a high pumping coefficient (that is, the aquifer W) and the amount of pumped water by test boring.
Thereafter, the well pipe 23 is buried in an appropriate place. A water collecting strainer 25 including a number of linear holes 24 is provided on the peripheral wall of the well tube 23. The perforated portion of the water collecting strainer 25 is a portion corresponding to the position of the aquifer W. 27 is a drive pump for sucking water. Reference numeral 29 denotes a water pipe connecting each pumping well 21.

In the drawing, the arrow indicates the direction of movement of water, and WL indicates the water level of the aquifer W.

[0014] In this area, 4
Water from Lake Towada (located further to the left of agricultural irrigation canal A in the figure, but omitted) will be discharged to agricultural irrigation canal A from around 20th March, and to Oirasegawa B from around 20th September. In other words, during the agricultural off season (refers to a period other than the agricultural busy season, here, from September 21 to April 19 every year), the conventional agricultural waterway A was not used and was idle. Therefore, when the snowmelt water of Mt. Hakkoda increases in the spring, conventionally, the snowmelt water is flown to Oirasegawa B as described above. However, in the present embodiment, water is discharged to the agricultural waterway A even during the agricultural off season. In other words, the idle facility is used, and water is supplied to the agricultural waterway A throughout the year. The water discharged into the agricultural waterway A is introduced into the filter device 7 by the water pipe 6, where the dust is removed therefrom, and then injected into the injection well 1. Then, this water is injected into the aquifer W through the hole 4 of the injection strainer 5 of the well pipe 3. This injection amount is monitored and measured by the monitoring device 13 in the injection well 1, and it is determined that there is enough injection capacity as long as water does not overflow from the pipe 12 extending to the ground, and water injection is continued.

Thus, the water discharged to the existing agricultural waterway A is stored in the aquifer W, which is a natural stratum, and can meet the demand for water during the depletion period. That is, in this area, a part of the water injected into the aquifer W appears as the spring water Ws near the boundary of the site F through the underground waterway H. Since this springing takes about three to four months, the water injected into the aquifer W from the injection well 1 in September can be used as spring water Ws from December to January of the following year.
Water injected into the aquifer W during the month is spring Ws around July to August.
Will be available as In other words, the spring water Ws is used when the spring water Ws appears at the site F. However, even when the spring water Ws is depleted, a sufficient amount of water is injected into the aquifer W. , This is the pumping well 21
, And can be appropriately sucked and used. In other words, in this area, water stored in the aquifer W, which is a natural stratum, can be used throughout the year.

According to this embodiment, the water is stored using the agricultural waterway A which is an idle facility during the off-farm season and utilizing the natural terrain, so that the cost is low and the maintenance is free. Then, the water to be retained is purified by various layers while descending the aquifer W, and the mineral content is replenished, so that the water quality is improved. Therefore, if such high-quality water is used as domestic water such as drinking water, it is good for health. It is expected that the amount and quality of harvest will be improved if used as agricultural water. In addition, agricultural waterway A and pumping well 2
Since the existing facilities such as No. 1 are used and a separate facility for dam construction is not required, it is possible to avoid duplicate investment and to prevent environmental damage due to dam construction. It is presumed that the existence of the agricultural waterway A which becomes an idle facility during the agricultural off season and the aquifer W with sufficient water supply in Japan are quite large in Japan, and in such a case, the present invention can be applied to all. .

Since the aquifer W exists deep underground, water does not evaporate during movement. Therefore, the water retention effect is significantly improved as compared with the conventional open-type water movement.

Further, since the snowmelt water is expected to flow out through the agricultural waterway A, the outflow to the sea is reduced as much as possible. Adverse effects on the system can be eliminated. Such effects have significant benefits for other industries, such as fishing.

Further, since sufficient water is injected into the aquifer W, land subsidence does not occur even when water is taken in the spring depletion period.

In addition, since the desired effect is obtained by using the agricultural waterway A which is not used except during the busy season (April to September), it is advantageous in terms of cost.

The present invention is not limited to the above embodiment. For example, when the amount of spring water Ws is sufficient for the whole year, it is not necessary to provide the pumping well 21.

The present invention can also be applied to irrigation of flat land as shown in FIGS.

Further, the present invention may be used to prevent flooding (flood control) of a river or the like depending on an application place.

Further, in the above embodiment, the injection well 1 is provided on the side of the water source, but the injection well 1 may be provided on the bottom of the water source.

In the present invention, a water source is a general term for ponds, swamps, lakes, etc., as well as flowing water paths such as waterways and rivers. The impermeable layer N refers to a poorly permeable layer having a small permeability coefficient and a non-permeable layer having a permeability coefficient of 0.

For the sake of convenience, the same reference numerals are given to the same members and portions, and the description thereof will be omitted.

[0027]

As described above, according to the present invention, reliable and efficient water intake can be achieved while preserving the natural environment.

[Brief description of the drawings]

FIG. 1 is a schematic view for explaining an embodiment of a water storage method according to the present invention, and is a plan view.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a schematic diagram for explaining another embodiment of the water storage method according to the present invention, and is a plan view.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a schematic view used to explain a conventional method, viewed from the top.

FIG. 6 is a schematic front view and a sectional view used to explain a conventional method.

[Explanation of symbols]

 Reference Signs List 1 injection well 3 well pipe 4 hole 5 injection strainer 6 water guide pipe 7 filter device 9 control valve 11 water injection pipe 12 pipe 13 monitoring device 21 pumping well 23 well pipe 24 hole 25 water collecting strainer 27 drive pump 29 water transmission pipe A agricultural water channel B Oirasegawa F Land Fr Paddy field Fi Farmland P Permeable layer N Impervious layer W Reservoir Ws Spring H Groundwater channel R Rainwater

Claims (9)

[Claims] 1. A water storage method comprising: digging an injection well along a water source; and injecting water from the water source into the underground aquifer through the injection well. 2. The water storage method according to claim 1, wherein said injection well is provided on a side of a water source. 3. The water storage method according to claim 1, wherein said injection well is provided at a bottom of a water source. 4. The water storage method according to claim 1, wherein a hole is provided in a peripheral wall of the pipe of the injection well, and water from a water source introduced into the injection well is injected into the underground aquifer through the pipe hole. A water storage method characterized by the following. 5. The water storage method according to claim 1, wherein said injection well is excavated along a water source at a span pitch determined based on a hydraulic conductivity. 6. The water storage method according to claim 1, wherein the injection well is provided in an area where a part of the water in the aquifer appears as spring water. 7. The water storage method according to claim 6, wherein the injection well is provided along a water source in a high-level area of a terrain having a height difference. 8. The water storage method according to claim 1, wherein a pumping well communicating with the aquifer is provided separately from the injection well, and water in the aquifer is taken out from the pumping well. . 9. The water storage method according to claim 8, wherein the injection well and the pumping well are provided on a flat ground having an aquifer.