R4: Regulatory Runoff Reduction in the Right-of-Way

Through its Green Continuum: Streets design guidelines (“The Continuum”), the City and County of Denver is implementing lower-impact low impact development on public projects in the right-of-way. The suite of green infrastructure tools outlined in the Continuum are intended to mitigate both stormwater runoff and urban heat island leading to cleaner, cooler, and more beautiful streets. The stormwater management approach is one of runoff reduction: infiltrating smaller, more frequent rain events carrying first flush pollutants into many shallow, pervious areas. This differs from the conventional, volume-based approach that has been in the city’s MS4 permit for decades. However, a “Runoff Reduction” pathway was added to Denver’s most recent MS4 permit that makes the control measures in the Continuum better suited for regulatory compliance. These control measures include shallow landscapes with no formal inflow/outflow, flow-through bioretention with little depression storage, and infiltration-only bioretention facilities. These proceedings will describe an Excel-based calculator that can aid in designing green infrastructure for regulatory compliance. The proceedings will include an overview of the runoff modeling and post-processing that underpins the calculator. This analysis includes development of regression equations that predict runoff with inputs available during design (e.g., soil classification, run-on ratio, geometry, etc.). The regression equations predicted runoff within 0.01 in. for a 0.6 in. design storm event in over 84% of 220,000 random green infrastructure configurations. While the calculator is developed for Denver’s regional climate and requirements, the proceedings offer a method for other municipalities looking to incorporate runoff reduction practices on right-of-way projects.

• Record URL:
  • https://doi.org/10.1061/9780784485002.014
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784485002
• Supplemental Notes:
  • © 2023 American Society of Civil Engineers.
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Bell, Colin D
  • Anderson, Sarah
  • Williams, Jeffrey
  • Cox, Bradford
• Conference:
  • International Low Impact Development Conference 2023
  • Location: Oklahoma City Oklahoma, United States
  • Date: 2023-8-6 to 2023-8-9
• Publication Date: 2023

Language

• English

Media Info

• Media Type: Web
• Pagination: pp 146-163
• Monograph Title: International Low Impact Development Conference 2023: Adaptation and Resilience for a Changing World

Subject/Index Terms

• TRT Terms: Drainage; Right of way (Land); Runoff; Sustainable development
• Geographic Terms: Denver (Colorado)
• Subject Areas: Environment; Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 01894202
• Record Type: Publication
• ISBN: 9780784485002
• Files: TRIS, ASCE
• Created Date: Sep 22 2023 1:32PM