Urban hydrology challenges and solutions: insights from the Birmingham Urban River Observatory

Urbanisation and climate change are driving an increase in impervious surfaces and extreme weather events, leading to water scarcity, flooding, pollution, and significant threats to river health in cities and downstream watersheds. Stormwater management and blue-green infrastructure further influence urban hydrology, while offering opportunities for mitigation and adaptation to enhance ecosystem and societal resilience in a rapidly changing world. Advancing hydrological research on the spatial and temporal dynamics of urban water quantity and quality is critical for identifying multi-scale patterns, understanding underlying processes, and providing the evidence base for targeted, scalable, and sustainable management interventions.

Against this backdrop, the NERC-NSFGEO SMARTWATER project seeks to diagnose and manage watershed-wide pollution “hotspots” (locations) and “hot moments” (times). This interdisciplinary initiative combines environmental sensing, data science, and numerical modelling to uncover the dynamic drivers of multi-contaminant pollution. Our focus here is on findings from the Birmingham Urban River Observatory, a UNESCO Intergovernmental Hydrology Programme Ecohydrology Demonstration Site within a global network applying ecohydrology principles for sustainable watershed management. The observatory employs high-frequency, in-situ water quality monitoring across low- to mid-order streams along an urban-to-peri-urban gradient.

This overview aims to reflect on five key objectives: (1) identifying and characterising pollution dynamics using scalable field diagnostic technologies, (2) developing smart water quality monitoring networks, (3) applying data science innovations (including AI) for pollution tracking, (4) leveraging high-frequency, distributed observations to improve pollution models and predictions, and (5) collaborating with stakeholders - such as citizen scientists through Birmingham River Champion - to implement practical solutions for water quality management and planetary health.

By sharing these experiences, we aim to transform how urban water challenges are diagnosed, understood, predicted, and managed.