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Nature-based Solutions for Sustainable Urban Design
Josh MacPhee
20th November 2024

This article explores how Nature-based Solutions, including green and blue infrastructure, sustainable water management and urban heat island mitigation, are transforming urban design.

The integration of sustainable solutions in masterplanning has recently focused on a trend towards Nature-based Solutions (NbS) and their application within the design process. NbS is a term for a range of approaches that share a fundamental principle: designing in harmony with natural forces, cycles and seasons rather than supervening them.

What are Nature-Based Solutions?

NbS are defined as actions and approaches that “protect, sustainably manage and restore natural or modified ecosystems,” whilst simultaneously supporting human activity and bringing well-being and biodiversity benefits.

They are increasingly recognised as an innovative approach to land and urban development, aiming to enhance resilience. The UN highlights them as robust and resilient, offering high returns in health and economic benefits, and presenting a more sustainable alternative to traditional grey infrastructure.

NbS utilise natural resources like clean air, water and soil to tackle environmental challenges, working with nature rather than against it. In contrast, unsustainable land and resource use contributes to biodiversity loss, increased pollution, deforestation and other negative impacts. They support ecosystems, societies and individuals in adapting to climate change while enhancing quality of life.

Urban Green and Blue Infrastructure Design

Urban Green and Blue Infrastructure (UGBI) within masterplans support sustainable development principles, enhance ecological conservation and contribute to community well-being.

These networks create a spatial foundation for NbS, integrating them to increase their collective impact. Composed of interconnected green and blue ecosystems through corridors and open spaces, they help the urban fabric adapt to climate change pressures, including flooding, drought, urban heat islands and habitat loss.

Green infrastructure refers to natural and semi-natural systems that provide multiple environmental, social and economic benefits, while blue infrastructure encompasses water bodies and systems, such as ponds, rain gardens, lakes, wetlands and stormwater management features.

When designed optimally, UGBI can provide numerous benefits to residents, including reduced urban heat island effect, enhanced walkability and bike-ability, improved outdoor comfort, better stormwater management, reduced pollution, increased natural habitats and biodiversity and improved ecosystem services.

By integrating UGBI, the masterplan can showcase a commitment to environmental stewardship and resilience in response to changing climatic conditions, while also enhancing the quality of life for both residents and visitors.

Understanding a workable green and blue network is central to any effective water management strategy. In Broadway Malyan’s Muscat Structure Plan, we addressed the city’s unique topography, located on a plain between the mountains and the coast. In this predominantly dry climate, sudden and heavy rainfall often leads to storm surges. To mitigate this, the plan incorporated the remediation and enhancement of the Wadis running between the upland and the sea. Restoring habitats along the river courses and recognising their role in mitigation and their value as amenities, has become a key element of the broader long-term structural plan.

This article is part of an ongoing series by Josh MacPhee. Next week, we'll continue our exploration of NsB, focusing on Sustainable Water Management.