Urban SuDS Case Study: Hebden Bridge Town Hall – Courtyard Rain Garden Planters

Calder Rivers Trust & Slow The Flow Calderdale

Rain Garden Planters

Slowing the flow of rainwater into the drainage system, thus reducing the potential for combined sewer flooding

The Town Hall Courtyard planters project is a collaborative community
venture, funded by a grant from the Postcode Local Trust.

It is part of a wider initiative to help us
all understand how urban Sustainable Drainage Systems (SuDS) can play a
part in flood alleviation.

The completed storm-water planters

Five large storm-water planters were installed in the courtyard of Hebden Bridge Town Hall in June 2018. Planters are 80cm high, 75cm deep and range from 90cm to 2.4m wide. They are made from tricoya, a sustainable and extremely durable engineered wood panel.

Ornamental and edible plants were chosen to withstand flood and drought conditions and to improve the riverside bio-diversity corridor.

adding the plants

Raised planters are good if space is tight, or ground conditions don’t allow water to soak away. They divert water from drainpipes, to slow / reduce the flow into sewers. They can be built over existing surfaces as long as there is a plan for any overfow. Excess water can continue into the existing system, as before.

With this being in a public space, it is ideal for promoting SuDS, particularly encouraging people to make their own interventions at home

Assembling the planters

Resilient plants have been chosen to cope with either flood or drought, and promote riverside  biodiversity – also some that the café can use in their delicious food!
Species list available here.

As part of wider research, the effectiveness of the planters at slowing down rainwater will be monitored by measuring the inflow and outflow of rainwater using the measuring gauges in one of the planters.

River Health
Rain gardens and other SuDS features filter the water and reduce the sediment that enters the river from runoff. By reducing peak flow into sewers they can also reduce the amount of serious pollution from Combined Sewer Overflows (CSOs), improving the quality of water in your local river.

Riverside Biodiversity Corridors
Linking landscaped spaces together along the riverside and including a variety of nectar rich species to attract insects and birds helps to create a wildlife corridor along the riverside.

Rain Garden Planter Construction
These planters are made from “extreme” Tricoya (#MTX) which has all the design flexibility of MDF, but is more durable and sustainable – perfect for external, wet and natural environments.
They were manufactured on a not-for-profit basis by local riverside social enterprise, Green Future Building and installed by volunteers.

The project has been funded by a £20,000 grant from People’s Postcode Lottery with collaborative design and implementation from the following:

To submit your own case study go here.

To find out more about how YOU can help to Slow The Flow, go here.

Species list for Hebden Bridge Town Hall Courtyard Rain Garden

See more information on the Hebden Bridge Town Hall – Courtyard Rain Garden Planters here.

Acer palmatum ‘Katsura’Japanese mapleSmall tree
Ajuga reptens ‘Chocolate Chip’Carpet buglePerennial
Alchemilla mollisLady’s mantlePerennial
Anemanthele lessonianaNew Zealand wind grassGrass
Astilbe japonica ‘Etna’False goat’s beardPerennial
Astilbe x arendsii ‘Diamant’False goat’s beardPerennial
Astrantia ‘Roma’Astrantia ‘Roma’Perennial
Bergenia ‘Abendglut’Evening glowPerennial
Brunnera macrophylla ‘Silver heart’Siberian buglossPerennial
Cirsium rivulare ‘Altropurpureaum’Plume thistlePerennial
Deschampsia cespitosaTufted hair grassGrass
Dryopteris offinis  ‘Pinderi’Golden shield fernFern
Dryopteris sieboldiAsian wood fernFern
Hackoneckla macra ‘All Gold’Japanese forest grassGrass
Helleborus varietiesLenten rosePerennial
Hesperantha coccinea ‘Professor Barnard’Flag lilyPerennial
Heuchera ‘marmalade’Alum rootPerennial
Iris sibirica ‘Dreaming Yellow’IrisPerennial
Liriope muscari ‘Big Blue’Big blue lilyturfPerennial
Liriope muscari ‘Okina’Frosted monkey grassPerennial
Miscanthus sinensis ‘little miss’Eulalia GrassGrass
Oenothera fructicosa ‘Fyrverkei’Evening primrosePerennial
Pulmonaria ‘Sissinghurst White’LungwortPerennial
X Heucherella ‘Spotlight’Coral bells crossed with FoamflowerPerennial
Allim tuberosumGarlic ChivesHerb
Foeniculum vulgareFennelHerb
Foeniculum vulgareBronze fennelHerb
Origanum vulgare ‘Aureum’Golden MarjoramHerb
Salvia officinalis ‘Purpurascens’Purple SageHerb
Thymus x citriodorusLemon ThymeHerb
Satureja montanaWinter savouryHerb
Origanum vulgareOreganoHerb
Artemisia dracunculusTarragonHerb

To find out more about how YOU can help to Slow The Flow, go here.