SuDS Planter Sizes / Prices ex VAT

These sizes are based on large, but manageable and movable sized units using a fork lift. This offers practical sized unit options to be used in combination to achieve the recommendation catchment areas stated above.

As well as the standard sizes, we can also construct the rain garden planter to bespoke requirements, but recommend a maximum length of 2000mm.
 

Prices do not include delivery.
(Please contact us for delivery to your site.)

Bespoke sizes for different roof drainage volume requirements and site restrictions

Many of our clients require SuDS planters sizes to meet the roof drainage volumes, as well as site restrictions.
We have therefore developed a bespoke service for variations in width, length, height and linear shape
of the SuDS Planters are bespoke sized made to order to suit the specific needs of each site and location. 

For a quote, please complete our Contact Form.

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Linked SuDS planters for larger roof areas.

For larger catchment areas we advise multiples of our standard or bespoke sizes, with each one fed
from a separate downpipe. Separate downpipes can usually be specified for new builds and extensions.

For situations where separate downpipes cannot be supplied, such as old buildings with cast iron downpipes,
we have developed the SuDS planters so that can be interlinked so that multiple planters can be fed
by the same drain downpipe connected via an overflow link between the planters.

SuDS Planter Storage and Flow Rates

The storage volume and retention and subsequent outflow rates will vary with the dimension of the planter to be incorporated into the scheme.

East of Eden SuDS Rain Garden planters are all based on the internal design features as recommended by South East Rivers Trust,
which was founded on extensive trial studies

The SuDS Manual states that typically the surface area of a bioretention feature would be 2-4% of the overall site area being drained, to prevent rapid clogging of the bioretention surface. Based on this guidance, the surface area of any planter (or combination of planters) should not be less than 2-4% of the roof area it is draining. Where possible, the size of the planter should reflect this recommendation.
 

As such, we offer a range of standard planter sizes to use from

1000mm L x 650mm W x 900mm H   to   2000mm L x 650mm W x 900mm H.

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Storage Layer

As mentioned, the storage value will depend on the dimensions of the planters. With a planting layer of 450 mm, this would leave approximately 400 mm for a sub-base water storage layer in our standard 850cm high SuDS Rain Garden planters.

A major advantage of East of Eden SuDS Rain Garden planters is that they have a suspended permeable Draintex geotextile lined floor with Delta dimpled sheet providing a substate layer reservoir of water to sustain the plants during dry periods.

Importantly, this also means that the sub-base layer is completely dedicated to water storage, in contrast to most other designs where the water stored is part of the substrate layers, significantly reducing their water storage capacity.

With a dedicated water only storage area, our rain garden planters are able to hold almost twice as much water, which is critical during a deluge, which will then be released slowly.
 

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Outflow rates

The standard rain garden planters are drained via a perforated drainage pipe running along the bottom of the planter. A number of factors influence the drainage rate including the drainage pipe diameter, soil mix and therefore infiltration rate, impact of plants and soil conditions prior to any particular rainfall event will be important.

Based on trial data from South East Rivers Trust narrow diameter (68mm) internal attenuation drainage system is fiited to limit the flow out of the planter to maximise the potential for flood storage, enhanced by the extra water storage provided by the dedicated water storage layer.

One hour after a rainfall event begins, up to 0.75 m3 of water can drain from the bottom of the planter. In reality the infiltration rate of the soil will have a notable impact of the volume and rate of water which can drain out of the bottom of the planter.

Hence the taller the planter the slower the infiltration rate. Also, the larger the overall dimensions of the planter will allow for more storage before the water level reaches the overflow downpipe.

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Embodied Carbon

• Made from FSC sourced UK grown Larch – Carbon Neutral

• Internal graduated perforated drainage pipe system for controlled release with sealed storage area to reduce plastic (recycled)components. • Installation above ground to reduce installation energy impact.

• Plus linked directly to drainage system to reduce flash flood impact without being inundated with oil residues, wastes, pesticides etc often released into waterways following storm surges

• Supports permanent aerial plant growth, which in turn:-

• Promotes carbon sequestration

• Enhances aesthetic value of the site – Promotes wellbeing

• Supports biodiversity, including nectar feeders, thus adding Biodiversit Net Gain(BNG) value for the site

• Constructed in the United Kingdom by UK based craftsmen

• Unique SuDS planter design has been developed so that there is an additional internal overflow flow system so that in the rare occasion that the water  storage area fills to the top it will not inundate the separate soil/compost area.
  

• The enhanced design of our SuDS planters allows them to be used for any type of plants specific to the needs of the client, and local climatic conditions. As such they can significiantly contribute to an enahnced BNG for most developments. They are ideal for growing veg, pollinators etc.