With the support of the Tree Design Action Group (TDAG) they held a workshop earlier this year to look at how the guide could promote and support the integration of trees and wider contemporary green infrastructure solutions. They explored the key principles of – collaborative design, prioritizing walking and cycling, supporting innovation and delivering welcoming, inclusive, resilient and safe places. To make sure including street trees in projects does become the norm 8Cs and TDAG recommended that:
- Design choices for trees should be context sensitive, identifying the right tree species,
- When weighing up benefits value the whole life benefit of the tree. Trees have immediate and wider value. Can use i-tree to assess.
- Realise the opportunity to impact on air quality, reduce flooding, sequester carbon and prevent overheating in urban areas.
- Place trees intelligently and consider integration with footways and carriageway, parking and vehicle speed management, utilities and microclimates.
- Technically – seek space efficient integration with utilities, protect trees, ensure adequately nourished and watered and minimize maintenance.
- Take a joined-up approach when advising developers.
The knowledge base to support integrated approaches is developing internationally with some excellent advice being published by TDAG. Their publication: Trees in Hard Landscapes, A Guide for Delivery, TDAG 2014 includes 30 Case Studies from the UK, Europe, the USA and Canada and some excellent diagrams and sections offering technical design solutions and notes on appropriate species selection.
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