Title: Data for manuscript 'An analytical approach to ascertain saturation-excess versus infiltration-excess overland flow in urban and reference landscapes'
Description: Uncontrolled overland flow drives flooding, erosion, and contaminant transport, with the severity of these outcomes often amplified in urban areas. In pervious media such as urban soils, overland flow is initiated via either infiltration‐excess (where precipitation rate exceeds infiltration capacity) or saturation‐excess (when precipitation volume exceeds soil profile storage) mechanisms. These processes call for different management strategies, making it important for municipalities to discern between them. In this study, we derived a generalized one‐dimensional model that distinguishes between infiltration‐excess overland flow (IEOF) and saturation‐excess overland flow (SEOF) using Green–Ampt infiltration concepts. Next, we applied this model to estimate overland flow generation from pervious areas in 11 U.S. cities. We used rainfall forcing that represented low‐ and high‐intensity events and compared responses among measured urban versus predevelopment reference soil hydraulic properties. The derivation showed that the propensity for IEOF versus SEOF is related to the equivalence between two nondimensional ratios: (a) precipitation rate to depth‐weighted hydraulic conductivity and (b) depth of soil profile restrictive layer to soil capillary potential. Across all cities, reference soil profiles were associated with greater IEOF for the high‐intensity set of storms, and urbanized soil profiles tended towards production of SEOF during the lower intensity set of storms. Urban soils produced more cumulative overland flow as a fraction of cumulative precipitation than did reference soils, particularly under conditions associated with SEOF. These results will assist cities in identifying the type and extent of interventions needed to manage storm water produced from pervious areas.
	
Authors: Ryan Stewart
	
Keywords: Crop and Soil Environmental Science, urban soil, stormwater runoff, urban hydrology, infiltration
	
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Publisher: University Libraries, Virginia Tech

	
Items in this dataset:

Title: Data_WRR_IEOFvSEOF_V2.zip
Description: This .zip file contains two components. 

The first, titled 'Data_IEOFvSEOF.xlsx', contains the data and analyses used to generate the main figures and findings of the manuscript.

The second is a folder titled 'PTFv2'. This folder contains all of the data and scripts required to generate the pedo-transfer functions that were used to estimate field-saturated hydraulic conductivity (Kfs) for all horizons in which that parameter was note measured. 

The scripts were created using R. The user should start with the file 'RF_Kfs.RMD', as that R Markdown file contains the main analysis and model outputs. 

The original file, improperly characterized, can be found at the following, https://data.lib.vt.edu/files/00000011h
	
Authors: Ryan Stewart
	
Resource type: Other Data
	
License: CC BY 3.0 US
	
Keywords: urban hydrology, infiltration, urban soil, stormwater runoff
	
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Date Uploaded: 2020-03-03

Title: Data_WRR_IEOFvSEOF.xlsx
Description: (V1, superseded by new version, https://data.lib.vt.edu/files/zc77sq25k) This file was updated to V2 to correct bad file characterization leading to data access issues.
	
Authors: sryan3@vt.edu
	
Resource type: Other Data
	
License: CC BY 3.0 US
	
Keywords: urban hydrology, infiltration, urban soil, stormwater runoff
	
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Date Uploaded: 2019-02-19