scholarly journals Quantifying the Effects of Residential Infill Redevelopment on Urban Stormwater Quality in Denver, Colorado

Water ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 988
Author(s):  
Kyle R. Gustafson ◽  
Pablo A. Garcia-Chevesich ◽  
Kimberly M. Slinski ◽  
Jonathan O. Sharp ◽  
John E. McCray
Keyword(s):  
Water Quality ◽  
Green Infrastructure ◽  
Stormwater Quality ◽  
Dry Period ◽  
Event Mean Concentration ◽  
Fecal Indicator ◽  
Water Quality Regulations ◽  
First Flush Effect ◽  
Urban Stormwater Quality ◽  
Mean Concentration

Stormwater quality in three urban watersheds in Denver that have been undergoing rapid infill redevelopment for about a decade was evaluated. Sampling was conducted over 18 months, considering 15 storms. Results: (1) The first-flush effect was observed for nutrients and total suspended solids (TSS) but not for total dissolved solids (TDS), conductivity, pH, and fecal indicator bacteria; (2) though no significant differences on event mean concentration (EMC) values were found among the three basins, local-scale EMCs were higher than traditional city-wide standards, particularly some metals and nutrients, most likely because of the significantly higher imperviousness of the studied urban basins compared to city averages; (3) peak rainfall intensity and total rainfall depth showed significant but weak correlations with some nutrients and metals, and TDS; (4) antecedent dry period were not correlated with water quality, except for phosphorus and lead; (5) contrary to what was expected, total coliforms and Escherichia coli were not correlated with TSS; and (6) no significant correlations between water quality and land-use or zoning categories were found. It was concluded that locally focused stormwater monitoring can aid data-driven decision-making by city planners where redevelopment is occurring at local “neighborhood scales”, particularly for the implementation and management related to green infrastructure and water-quality regulations.

Design of a retention tank: comparison of stormwater quality models with various levels of complexity

2006 ◽  
Vol 54 (6-7) ◽  
pp. 231-238 ◽  
Author(s):  
M. Mourad ◽  
J.-L. Bertrand-Krajewski ◽  
G. Chebbo
Keyword(s):  
Simulation Models ◽  
Data Sets ◽  
Calibration Data ◽  
Storm Events ◽  
Stormwater Quality ◽  
Event Mean Concentration ◽  
Transport Modelling ◽  
Detention Tank ◽  
Systems Modelling ◽  
Mean Concentration

Stormwater quality simulation models are useful tools for the design and management of sewer systems. Modelling results are highly sensitive to experimental data used for calibration. This sensitivity is examined for three modelling approaches of various complexities (site mean concentration approach, event mean concentration approach and build-up, washoff and transport modelling approach) applied to a typical case study (design of a dry detention tank), accounting for the variability of calibration data and their effect on simulation results. Calibrated models with different calibration data sets were used to simulate 3 years of rainfall with different retention tank specific volumes. Annual pollutant load interception efficiencies were determined. Simulations results revealed i) that there is no advantage in using the EMC model compared to the SMC model and ii) that the BWT model resulted in higher design ratios than those given by the SMC/hydraulic approach. For both EMC and BWT models, using an increasing number n of events for calibration leads to narrower confidence intervals for the design ratios. It is crucial for design ratios to account for successive storm events in chronological order and to account for the maximum allowable flow to be transferred to the downstream WWTP.

STORAGE DYNAMICS REVEALED BY WATER ISOTOPES PROVIDE INSIGHT INTO WATER QUALITY FUNCTION OF STORMWATER GREEN INFRASTRUCTURE

2017 ◽  
Author(s):  
Anne J. Jefferson ◽  
◽  
Laura L. Sugano ◽  
Hayley Buzulencia ◽  
Pedro Avellaneda ◽  
...  
Keyword(s):  
Water Quality ◽  
Green Infrastructure ◽  
Water Isotopes ◽  
Quality Function ◽  
Insight Into

scholarly journals Determination of NPS Pollutant Unit Loads from Different Landuses

2021 ◽  
Vol 13 (13) ◽  
pp. 7193
Author(s):  
Jiyeon Choi ◽  
Baekyung Park ◽  
Jinsun Kim ◽  
Soyoung Lee ◽  
Jichul Ryu ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Oxygen Demand ◽  
Runoff Coefficient ◽  
Forest Land ◽  
Event Mean Concentration ◽  
Rainfall Events ◽  
Total Phosphorous ◽  
Mean Concentration

This study aimed to estimate pollutant unit loads for different landuses and pollutants that reflected long-term runoff characteristics of nonpoint source (NPS) pollutants and recent environmental changes. During 2008–2014, 2026 rainfall events were monitored. The average values of antecedent dry days, total rainfall, rainfall intensity, rainfall duration, runoff duration, and runoff coefficient for each landuse were 3.8–5.9 d, 35.2–65.0 mm, 2.9–4.1 mm/h, 12.5–20.4 h, 12.4–27.9 h, and 0.24–0.45, respectively. Uplands (UL) exhibited high suspended solids (SS, 606.2 mg/L), total nitrogen (TN, 7.38 mg/L), and total phosphorous (TP, 2.27 mg/L) levels, whereas the runoff coefficient was high in the building sites (BS), with a high impervious surface ratio. The event mean concentration (EMC) for biological oxygen demand (BOD) was the highest in BS (8.0 mg/L), while the EMC was the highest in BS (in the rainfall range <10 mm) and UL and forest land (in the rainfall range >50 mm). The unit loads for BOD (1.49–17.76 kg/km2·d), TN (1.462–10.147 kg/km2·d), TP (0.094–1.435 kg/km2·d), and SS (15.20–327.70 kg/km2·d) were calculated. The findings can be used to manage NPS pollutants and watershed environments and implement relevant associated management systems.

Primary Traffic Related Pollutants and Urban Stormwater Quality

2017 ◽  
pp. 1-16
Author(s):  
Janaka M. A. Gunawardena ◽  
An Liu ◽  
Prasanna Egodawatta ◽  
Godwin A. Ayoko ◽  
Ashantha Goonetilleke
Keyword(s):  
Stormwater Quality ◽  
Urban Stormwater ◽  
Urban Stormwater Quality
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