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Rain Garden, Tawd Valley Allotments, Skelmersdale

Rain Garden Community Classroom

Tawd Valley Allotments, Skelmersdale

Client: West Lancashire Borough Council
Final Value: £24,200
Start Date: Mar 2022
Finish Date: Jun 2022 



Tawd Valley Park is an area of green open space of approximately 65 hectares running from Skelmersdale town centre and following the line of the River Tawd as it heads northwards to join the River Douglas.

CCNW was commissioned by West Lancashire Borough Council for this project initiated by the Friends of Tawd Valley community group. The project aims to provide a community classroom and rain garden as an educational resource for school children and the local community.

Rain gardens are designed to mimic the natural water retention of undeveloped land and reduce the volume of rainwater run-off into drains from impervious areas and treat low level pollution.

‘The Tawd’ is a large country park and a haven for a wide variety of wildlife including birds of prey, Kingfishers, Dippers and Wagtails.

CCNW Solution

Site Preparation
The CCNW team carried out initial site preparation works, excavation for the soakaway area, and placing the spoil within the designated areas for re-use as back-fill.

Installation of ‘Klargester BioTec’ Sewage treatment plant
Following the site preparation, a Klargester BioTec’ Sewage treatment plant was installed. The treatment plant is an eco-friendly system with an aerobic biological trickling filter that treats the sewage. Wastewater passes through the biological filter and a series of pipes to be laid underneath the rain garden. 

Creation of Rain Garden
The footprint of the rain garden was excavated by the CCNW conservation team, installing inlet pipes for the rain garden and 110mm sewer pipes for approximately 36m from the new toilet block to the rain garden. 

A gravel bed was laid to a depth of 300mm, and pipes from the Klargester were laid to provide a herringbone drain system. This will allow the effluent from the treatment plant to spread out and infiltrate the ground. In addition, 110mm perforated twinwall pipes were installed. 

Top soil was used to cover the pipes, and marginal plant species were transplanted. Species include Hosta, Iris, Water mint, Golden Groundsel and Ragged Robin. The water will be filtered as it passes through this area, improving the water quality, and will eventually flow back into the River Tawd. 

Construction of Green Roof and Rain water harvesting system
Two large, sloping roofs were constructed on the flat roof of the classroom container. The roofs were lined with weed-proof matting, filled with topsoil, and Sedum roof roll was applied. 

Green Roofs are a fantastic habitat for invertebrates, will help keep the classroom cool inside and will filter the water collected via the guttering system around the top of the classroom. Water collected from the guttering will be collected in a water container located at the back of the building, allowing rainwater to be harvested efficiently for use on the allotment. 

Special Features

Rain Garden
Community Educational Classroom


Rain Water Harvesting
Community Engagement
Biological waste treatment

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