Buried tanks – detention and retention systems

  1. small capacity water tanks – commonly used for rain water storage (4-10 m3)
  2. industrial capacity tanks – firewater, stormwater (10-50 m3)
  3. detention retention systems linked in array – firewater, stormwater (> 50 m3)

General description

Water storing – long term or temporary – is becoming more and more important with the environment changes of today. Heavy storms deliver huge amount of water that the existing canalization is unable to dispose of, or the long periods without natural resupply of water both lead to a need of some kind of water management.

Corrugated steel structures are cost effective and performing solutions for both of the above problems, with their durability, flexibility and strength; they prove to be the most versatile product for storm water detention and retention applications.

The water-tightness of the seaming of standard corrugated pipes can be realized by inserting a simple rubber gasket inside the seam lock, during roll forming. By closing the pipe bevels with steel bottom plates, a water storage tank is created. Special applications like shafts, man holes, in and outlets, flow separators, can easily be realized by simple steel works. By means of different tank layout – linear, in battery or mixed – the most storage can be realized on a given shape and size surface.

Corrugated steel storage tanks maintain the structural strength of CSP pipes; this load bearing capacity is the result of soil and steel interaction. As flexible steel acts with the surrounding soil fill to support the loads, the quality of the soil and compaction around and over the structure must be ensured.

The dimensioning and load bearing check of our Spiral structures are performed with the use of computer software, based on the so-called AISI calculation method defined in American Iron and Steel Institute „Handbook of Steel Drainage and Highway Construction Products”.
The load bearing and structural check of our bottom plates have been carried out by computer simulations, using up-to date engineering software like AXIS.

The main advantages of CSP tanks:

  • Easy and quick installation
  • Structure is load bearing immediately after installation
  • Weather conditions affect less the installation
  • Based on long term experience, the costs of maintenance of these structures are far below of those, that are produced for same application using different production technologies

Case studies, general information and cost analysis on CSP tanks »

Fabricated bevels, elbows, fitiings allow the execution of the wide range of different solutions.

Fields of Application

TUBOSIDER SPIREL helical seam locked steel corrugated tanks are typically used for water management and water quality design. The development of undisturbed areas or changes in land usage and drainage patterns can lead to localized flooding, stream channel destabilization and erosion. These effects can be avoided by careful design of an effective stormwater management system. An efficient stormwater management plan considers both the quantity and the quality of runoff collected. Using CSP structures for design elements is an effective technique for achieving storm water quantity and quality control.

Detention systems

A detention system provides a means of storing or detaining storm water for a controlled release. Detention systems consist of on-site ponds or below ground structures. CSP for buried structures provides an economical, structurally sound method of collecting, storing and discharging stromwater that allows for greater utilization of land over above-ground-systems. Frequently, these systems are used under parking lots or recreation areas to maximize land usage.
The purpose of a detention system is to manage the difference in the flow rates between storm peak runoffs and allowed flow. Any given detention system must be designed to provide a proper volume of storage and a well designed flow control to limit the outflow of the system.

Storage tanks

A storage tank provides a means of storing water – whether being rain or urban water – for lateral or special condition use. It can serve as water source for gardening and agricultural purposes or can be available for fire protection as in case of fire water storage tank. These systems consist of on-site ponds or below ground structures. CSP for buried structures provides an economical, structurally sound method of storage, as can be installed under parking lots, drive-ways or other areas in order to maximize land usage.

Soakaway systems

In situations where the excess of rainwater cannot be discharged to any recipient, the solution are soakaway systems. These systems are similar to underground detention systems able to accomodate sudden peak of rainfall, but instead of holding the water, by means of special connection, these are providing controled discharge of the rainwater to the surrounding backfill. This way, emptying out for the next rainfall event. Primary benefits of our systems compared to competetive products is the human accessibility of our systems, meaning a real opportunity not just to monitor, but to clean and maintain the systems, resulting in a long service life.The systems maintain the structural strength of CSP pipe or tanks, therefore these systems can be installed under parking lots or traffic. Similartly to detention systems, a variable footprint and capacity can be achieved. Execution of these systems is quick and cost effective. We provide support to our clients to the dimensioning of these systems, taking into consideration all jobsite characteristics.

Water quality devices

These represent a variety of structures designed to remove pollutants thru hydrodynamic forces or filtration. Water quality devices have different capabilities for removing pollutants, they are useful as pretreatment or polishing systems, depending their removal efficiencies and local regulations. Pre-treatment systems generally remove sediment, thrash, debris and other suspended materials prior to detention or storage systems. Post treatments are used to remove suspended materials as well as dissolved metals, nutrients, bacteria and chemicals. Post treatment systems can be standalone or in conjunction with detention. CSP structures are widely used for oil/sediment separators and sand filters. Tubo Hungária Ltd is producing oil separators equiped with the filtering technology owned and licensed by Pureco Ltd under Pureco ENVIA TNP brand name. more information here: Pureco ENVIA TNP

Customized systems: variable foot-print and volume achieved using linear, linked or array of tanks

Execution

Corrugated steel storage tanks maintain the structural strength of CSP pipes; this load bearing capacity is the result of soil and steel interaction. As flexible steel acts with the surrounding soil fill to support the loads, the quality of the soil and compaction around and over the structure must be ensured.

It is possible to design structures according specific loads – both no dynamic load systems and highway load systems are available.