Dear Colleagues,

Globally as major urban centers expand land development into adjacent rural areas, rivers and streams can be severely impacted by hydromodification causing a loss of geomorphic stability, mesohabitat structure, riparian and stream biodiversity, water quality, and natural aesthetics and public health. Though stream restoration has been practiced for several decades now, specific techniques for the rehabilitation/revitalization of urban streams remain a challenge. Challenges include adequately addressing the spatially-varied and episodic land development within a watershed that create non-stationary in the geomorphic dominant discharge, civil infrastructure that constrain natural floodplain inundation and planform migration, fragmented drainage networks that reduce ecological connectivity and aquatic biota recolonization potential, and community differences in social views of natural resources that vary local objectives and priorities. Because of urban hydromodification, it is evident that stream rehabilitation projects need to be planned and prioritized within watersheds, and effectively integrated with stormwater management and flood control programs. Reasonable expectations for ecological functional lift and structural performance outcomes need to be objective-based and technically supported. This special issue of IJERPH aims to highlight advances in urban stream restoration practices, more appropriately termed rehabilitation, revitalization, or enhancement, that account for the unique challenges in urban riverine environments, including topics associated with pre- and post-project monitoring and assessment, planning, and project design and implementation/construction.

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• urban stream restoration
• stream rehabilitation
• pre- and post-project monitoring and assessment
• stream restoration planning
• stream restoration project design
• stream restoration implementation
• stream restoration construction