Wastewater discharges and urban land cover dominate urban hydrology signals across England and Wales

Coxon, Gemma; McMillan, Hilary; Bloomfield, John P. ORCID: https://orcid.org/0000-0002-5730-1723; Bolotin, Lauren; Dean, Joshua F; Kelleher, Christa; Slater, Louise; Zheng, Yanchen. 2024 Wastewater discharges and urban land cover dominate urban hydrology signals across England and Wales. Environmental Research Letters, 19 (8), 084016. https://doi.org/10.1088/1748-9326/ad5bf2

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Official URL: http://dx.doi.org/10.1088/1748-9326/ad5bf2

Abstract/Summary

Urbanisation is an important driver of changes in streamflow. These changes are not uniform across catchments due to the diverse nature of water sources, storage, and pathways in urban river systems. While land cover data are typically used in urban hydrology analyses, other characteristics of urban systems (such as water management practices) are poorly quantified which means that urbanisation impacts on streamflow are often difficult to detect and quantify. Here, we assess urban impacts on streamflow dynamics for 711 catchments across England and Wales. We use the CAMELS-GB dataset, which is a large-sample hydrology dataset containing hydro-meteorological timeseries and catchment attributes characterising climate, geology, water management practices and land cover. We quantify urban impacts on a wide range of streamflow dynamics (flow magnitudes, variability, frequency, and duration) using random forest models. We demonstrate that wastewater discharges from sewage treatment plants and urban land cover dominate urban hydrology signals across England and Wales. Wastewater discharges increase low flows and reduce flashiness in urban catchments. In contrast, urban land cover increases flashiness and frequency of medium and high flow events. We highlight the need to move beyond land cover metrics and include other features of urban river systems in hydrological analyses to quantify current and future drivers of urban streamflow.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1088/1748-9326/ad5bf2
ISSN:	1748-9326
Additional Keywords:	GroundwaterBGS
Date made live:	14 Aug 2024 10:31 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/537853

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1088/1748-9326/ad5bf2

ISSN:

1748-9326

Additional Keywords:

GroundwaterBGS

Date made live:

14 Aug 2024 10:31 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/537853