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Updated: Mar 12, 2026

Design and Construction of an Urban Runoff Research Facility
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Transit time modeling framework for predicting freshwater salinization in urban catchments.

Shantanu V Bhide1, Stanley B Grant1, Kevin McGuire2

  • 1Occoquan Watershed Monitoring Laboratory, Department of Civil and Environmental Engineering, Virginia Tech, 9408 Prince William St, Manassas, 20110, VA, USA.

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|March 10, 2026
PubMed
Summary

Urban freshwater salinization is increasing due to road deicers. This study models salt transport pathways, revealing how winter snowmelt and summer storms impact stream salinity in urban watersheds.

Keywords:
HydrologySalinizationTransit time theoryWater age

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Area of Science:

  • Environmental Science
  • Hydrology
  • Ecology

Background:

  • Global inland freshwater salinity is rising, especially in urban areas, due to widespread winter road deicer application.
  • Understanding stream salinity dynamics is complex, hindered by episodic salt inputs, engineered drainage, and coupled hydrological processes.

Purpose of the Study:

  • To develop and apply a modeling framework to simulate salt transport through various pathways in urban watersheds.
  • To attribute stream salinity dynamics to specific sources and transport mechanisms.

Main Methods:

  • Coupled a climate-driven deicer build-up/wash-off model with transient transit time distribution theory.
  • Simulated salt transport via drainage, interflow, and groundwater pathways.
  • Applied the framework to a decade of high-frequency salinity data from an urban watershed in Northern Virginia.

Main Results:

  • The model accurately reproduced ten years of stream salinity measurements across multiple timescales.
  • Estimated average annual deicer application at 206 tonnes of chloride (Cl-) per year.
  • Identified enhanced vadose-zone and interflow contributions to salinity during winter due to infiltration of snowmelt and deicers.

Conclusions:

  • The model links climate-driven deicer inputs, hydrologic connectivity, and stream water age.
  • Provides a transferable framework for diagnosing and managing freshwater salinization in urban environments.
  • Highlights the role of subsurface pathways and seasonal hydrologic turnover in regulating stream salinity.