Rain Garden SuDS Planters

A Sustainable Way to Manage Rainwater Run-Off

Our rain garden Sustainable Drainage System (SuDS) Rain Garden planters are supplied fully assembled and ready to install into your drainage system. 

They are supplied lined, with the complete internal drainage system fitted, including screened overflow and drainage pipe outlet ready to fit into your site drainage system.

The drainage support pipe system is supported by specialist, light-weight aerating leca granules. The whole SuDS system is then covered with geotextile membrane to keep it separate from the compost. 

As featured in:
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Present lead time 7 to 8 weeks
rain garden SuDS planters

Download our Full Comprehensive Guide to SuDS Rain Garden Planters

For a full comprehensive guide to our SuDS Rain Garden planters click the button below to download our PDF.


- Full list of Advantages
- Full details about the internal drainage system 
- Plants suited to rain garden planters 
- Full technical data
- Staining options
East of Eden SuDS Planters

SuDS Planter Sizes / Prices ex VAT


Size (mm)

All inclusive Price ex VAT (£)

1000 x 650 x 900


1200 x 650 x 900


1500 x 650 x 900


1800 x 650 x 900


2000 x 650 x 900


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

Due to frequent increases in the cost of raw materials in recent times, all prices are subject to confirmation before an order is accepted.

Lead Time for new Orders: With present demand the present Lead Time is 7 to 8 weeks.



All Larch Rain Garden SuDS planters are made to order. 

Production time is usually 5 to 8 weeks. 


Bespoke Service 

Most Rain Garden Planters are bespoke made to order to suit the specific needs of each site and location. 
For a quote, please complete our
Contact Form.

Integrating Sustainble Drainage Systems (SuDS)

Rain garden planters are an appealing adaptation of Sustainable Drainage Systems (SuDS) feature which steadies surface water flows, and reduces surface water flood risk.

With both bio-retention and additional internal storage, theses planters are an innovative solution to property level retro-fit SuDS, and can work out very much less expensive than most groundworks intervention.

SuDS interventions, such as these planters, can of course have multiple Green Infrastructure benefits, in addition to their contribution to flood alleviation, when thoughtfully designed.

You could also opt for a planting palette that contribute towards boosting biodiversity.


Choose from our standard finishes or contact us to discuss custom colour options.

Learn more about Rain Gardens

SuDS Rain garden planters: Designed to help alleviate Flooding

As a result of climate change, we are seeing more and more flash floods occuring due to extreme rainfall. This is further amplified by the trend for covering gardens with impervious materials instead of rain absorbing lawns, including front gardens paved for driveways and the reduced sized of back gardens in favour of new buildings. 

Rain garden planters, or stormwater planters,  are a sustainable stormwater management solution with their clever internal drainage system. 

They collect rooftop runoff and work like a rain garden in a planter allowing for sustainable stormwater management. 

These planters are particularly useful if you have a significant amount of rain water traveling from the rooftop or other impervious surface directly into a drain causing flooding on your property.
All Rain Garden SuDS Planter sizes are bespoke to meet the requirements of each client, and made to order.

For a quote, please click below to request a quote

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How Do Rain Garden Planters work?

A rain garden planter utilises rain water that lands on the roof. Water from the drain pipe is directed into the planter. The soil absorbs and stores the rainwater for the plants to use, known as bioretention. 

Excess rainwater filters into the gravel layer and drains out the perforated base drainage pipe.

Any water that pools on the surface, drains down the overflow upstand.

They work in the same way as rain gardens just on a smaller scale.

Feel free to get in touch to speak to a member of our design team today. 
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rain garden planter

Water Storage Volume for Standard SuDS 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 in 1000mm L x 650mm W x 900mm H to 2000mm L x 650mm W x 900mm H.

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. For greater catchment we advise to install multiple planters fed by the same drain downpipe connected via the top of the planters.


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.

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.


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:-

o Promotes carbon sequestration,
o Enhances aesthetic value of the site – Promotes wellbeing
o Supports biodiversity, including nectar feeders.
o Constructed in the United Kingdom by UK based craftsmen


Rain Garden Planter Interior: All planters come fully lined

Drainage outlet

The drainage outlet from the internal slow release system can be located to suit your specific site requirements. In most situations the outlet is required to feed into the downpipe drain that already exists, which will therefore located directly below the planter. For these projects the outlet feeds through the base of the rain garden SuDS planter, as shown in the figures below


Some clients have requested an outlet form the lowest point from a side wall, as shown in the Rain Garden SuDS planter on page 4 in pdf. 

During the construction of the planters, our workshop manager will contact you to discuss the location of the outlet

Water may discharge from a planter into the normal drains or it could be diverted further into a Rain Garden.

For an enhance biophilic and aesthetic effect, we like to encourage the construction of landscaped features that the water could travel along and slowly percolate into the soil, such as:

  • an attractively constructed rill
  • gulley
  • channel into a garden bed
See example opposite
rain garden planter
Talk to a member of our design team for a bespoke design tailor made to your needs
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A Sustainable Way to Manage Surface Water


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