Rainwater Storage & Use

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セル型構造地下貯水槽

世界で初めて実現した
完全防水型地下貯水槽

貯留材とよばれる、プラスチック製等の部材を組み立てて立体を築き、その全体を遮水シートで包んで形成する貯留槽の一種ですが、トーテツは、セル型構造と名付けた二重構造の採用により、構造的に完全防水と言える貯水槽を完成しました。
社団法人雨水貯留浸透技術協会より、技術評価認定書を取得。

除塵管理枡

ゴミ塵埃の99％以上を除去

U字側溝から流入する、雨水中の汚染物質を除去する目的で開発したものです。この除塵管理枡の完成により、セル型構造地下貯水槽内には、きれいな雨水を貯水することが可能になり、「雨水都市の建設」といったことが現実のものとなりました。
社団法人雨水貯留浸透技術協会より、雨水貯留浸透製品評価認定書を取得。

ぶんりゅうⅡ型

しばらく前まで、屋根・屋上に降る雨水を地上のタンクに貯める場合、タンクは建物の近くに置かざるを得ないという宿命にありました。しかし、トーテツが完成した雨水分流除塵器「ぶんりゅうⅡ型」はこの常識を変え、タンクはどこにでも置けることを可能にしました。
社団法人雨水貯留浸透技術協会より、雨水貯留浸透製品評価認定書を取得。

Totetsu created a complete product line for full scale rainwater use as a resource.

Rainwater use as a third water source

Most rain that falls on mountains and plains form rivers that flow into the sea. Sea water heated by energy from the sun evaporates to form clouds, which again produces rain that falls on the ground, making it fertile and continuing the eternal cycle.

Nature thus uses energy from the sun to desalinate seawater. In a rather different manner, mankind has for some time been artificially harnessing vast amounts of energy to desalinate seawater.

While it may be unavoidable to resort to such technology to resolve our water shortages, should we not first consider more effective utilization of rainwater, a gift from heaven?

Since rain water is in effect distilled water, it is extremely pure, and a water resource that can be obtained with a minimum of energy and without harming the environment.

Airborne pollution, which mixes with rain, contaminates naturally pure rainwater. Dirt adhering to roofs and road surfaces also contaminates rainwater, but most of it is washed away by the first drops of rain. By eliminating this initial catch, we can obtain clean water to store in a tank.

Rainwater should be positioned as a third water source following 1) rivers and lakes, 2) groundwater. Before using recycled wastewater or desalinating seawater which requires vast amounts of energy, rainwater should be used more widely as a means to solve water problems.

Construction of a Rainwater City

“Construction of a Rainwater City” is achieved by building a system comprised of the Cell Structure Water Tank and the Sediment Removal Control Box, both developed by Totetsu. Below is an example of a collection and storage system for rainwater city construction.

(Example 1) Comprehensive Rainwater Use Proposed for a New City Construction Plan in China

(Example 2) Proposed Comprehensive Rainwater Use in Existing City Block

Collection & Storage System to Construct a Rainwater City

Underground Storage Tanks Collecting Water Over a Wide Area

This is a way to store large volumes of water, pattern collecting rainwater which sinks in the ground, from building roofs and gutters, from large and small rivers, rainwater conducted from mountain slopes, etc.

Solve Water Problems

This wide area water collecting storage tank plays a role as a water source alternative to dams. This water storage system can solve the water problems we now increasingly face.

Since ancient times, humans have built artificial reservoirs to store water for use in our lives, but reservoirs lose water through evaporation, and they easily become tainted by foreign matter mixing in the water.

Our water storage system does not have this problem. Water can be stored and used by installing large cell structure water tanks upstream, midstream, and downstream of rivers.

With this storage system, rainwater that falls in each area is basically stored and used there. But if that is not enough, a collection pipe from a large or small river nearby can be used to bring water for storage in cells.

When heavy rains raise river water above a certain level, creating flood risk, then collecting water all at once in these underground water tanks prevents or reduces damage, for a system which essentially kills 2 birds with 1 stone.

Cell Structure Water Tank

World’s First Completely Waterproof Underground Storage Tank

This is a type of water tank Totetsu created by combining parts called storage materials made from plastic etc. to build a structure, and enveloping the entire structure in waterproof sheets. Totetsu named it a cell structure. This two layer structure water tank can be considered structurally completely waterproof.
This received a Technology Assessment Certificate from the Association for Rainwater Storage and Infiltration Technology.

Bunryu II type

Until a while ago, when rainwater that fell on the roof was stored in a tank, that tank had to be placed near the building. But Totetsu created the “Bunryu II” rainwater sediment separation device, which dramatically expands options by making it possible to place tanks anywhere.
This received a Rainwater Storage and Infiltration Product Assessment Certificate from the Association for Rainwater Storage and Infiltration Technology.

Sediment Removal Control Box

Removes Over 99% of Sediment

This was developed to remove pollutant matter in rainwater flowing in from a U shaped channel. Creating this Sediment Removal Control Box enabled storage of clean rainwater in the cell structure water tank. This made it realistic to “Construct a Rainwater City”.
This received a Rainwater Storage and Infiltration Product Assessment Certificate from the Association for Rainwater Storage and Infiltration Technology.

雨水貯留・利用の総合メーカー「トーテツ」は、雨水の本格利用を推進します。