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"Important NOTE!!!" Information Provided On This Website Is Intended For... "GENERAL INFORMATION
ONLY!!!" And Must Be Only Be Used Only As A "GUIDE!!!" It Must Not Be Used For Decision Making, Or
Be Used For Any Building Purposes Or Legal Proceedings. Refer To Our Policies On This Website.

Things You Need To Know... About On-Site Stormwater Detention Tanks.

On-site storm water detention tanks are used as a method for temporarily storing storm water and then releasing it slowly so that it does not worsen any flood situation downstream.

This type of detention vaults is usually constructed in urban settings only.

Underground detention of storm water allows for a large volume of water to be stored in a relatively small
foot print area. The vault is typically constructed under a parking lot or on other convenient open land.

In multi storied buildings they are frequently located under the parking garage.

However, compared to open surface detention, an underground vault may be the better option; since the
land used for open storage may have other uses such as a park or walkway.

In addition unwanted birds and animals may be attracted to these surface water detention ponds. Open
water could also pose a safety hazard, especially to children.

These considerations should also be taken into account when deciding the storm water storage.

WHAT'S IN THE DESIGN OF AN ON-SITE STORMWATER DETENTION TANK

An on-site detention facility usually consists of three parts. The discharge control pit or DCP is used to
control the rate of discharge of storm water from the site.

The second part of this system consists of the storage tank. The discharge restriction of the discharge
control pit causes the excess storm water to be channeled into a storage area. The storm water remains
in this storage unit until the rain stops.

The third part is the site drainage system. All the excess storm water is channeled, via the site drainage system, to the discharge control pit.

The discharge control pit consists of a detention vault. The size of the detention vault depends on the
following factors:

* The Average Rainfall During The Rainy Season
* The Place Is Prone To Storms
* The Place Is Prone To Floods
* Local Building Regulations

The more prone an area is to floods and storms, the larger the detention vault has to be.

However, due to practical limitations... there is only a certain maximum size to which the tank can be built.

The criteria in the local building regulations have also to be satisfied.

The detention vault can store a considerable volume of water in relatively small area.

Detention vaults are constructed using a wide array of materials. Corrugated metal, steel, aluminum, fiberglass etc. are used to construct the detention vault.

The detention vault can also be made by using pre-cast concrete tanks or even constructed by pouring concrete in-situ. It should be sufficiently strong to withstand the static pressure of water.

The shape of the tank is determined by the area in which it is constructed. If it is constructed under a
building, it may largely follow the shape of the building.

Since drainage is mostly achieved by gravity, the height of each component of the system is crucial.

WHY SHOULD YOU HAVE ON-SITE STORMWATER DETENTION TANKS?

In some areas it is mandated by law. Local building and development rules ensure that all properties have
an on-site water detention tank systems. The design will have to be approved by the local authority.

The owner is duty bound not only to construct it, but also has to maintain it in good shape.

Even subsequent owners are bound by this stipulation and cannot do away with it.

At times, the layout of property may be such that the storage of water poses a danger to the property and those around it. In this case, the council may grant an exemption.

However, Sufficient Data Should Back Up The Claim For Exemption:

Since an on-site detention tank system is mandatory in some areas, owners have assimilated it to blend
into their landscaping.  This way... the requirements of law are satisfied at the same time the aesthetic
beauty of the garden is maintained.

Since having an on-site detention tank system adds to the cost of property, many property owners feel that they are paying for the mistakes of the government in not taking appropriate flood control measures.

However, the on-site detention tanks are used to prevent current flooding problems from growing, and not
to correct past mistakes.

On-site storm water detention tanks have a practical use. They should not be viewed in isolation from the
point of view of costs alone. They are for the greater good of the neighborhood.

In fact by having these detention tanks, flooding is prevented and as a result, the property retains its value or even goes up in the property market.


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"Important NOTE!!!" Information Provided On This Website Is Intended For... "GENERAL INFORMATION
ONLY!!!" And Must Be Only Be Used Only As A "GUIDE!!!" It Must Not Be Used For Decision Making, Or
Be Used For Any Building Purposes Or Legal Proceedings. Refer To Our Policies On This Website.

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