Developing a Decision Making Tool for Determining LID Stormwater Detention Requirements for the Lower Rio Grande Valley

 

Kim Jones, Taufiq Alam

Texas A&M University-Kingsville, ISEE

&

Javier Guerrero

Civil Engineering, University of Texas Rio Grande Valley

I. DMT for LRGV LID stormwater management and planning

Project Partners:

  • Border Environmental Cooperation Commission
  • US EPA Border 2020 program
  • Texas A&M University Kingsville
  • LRGV TPDES Stormwater Task Force
  • University of Texas Rio Grande Valley
  • Cameron County and Cities of Edinburg, Weslaco, Donna
  • South Texas College
  • Regional EDC
II. Project Objectives
  • Develop a user friendly design tool (DMT) to reduce reliance on traditional detention pond solutions and promote innovative LID/GI technologies to reduce BMP footprints, conserve land resources and improve water quality by incorporating subsurface and LID storage and runoff reduction calculations into the design process for the LRGV
  • Incorporate outreach and education into workshops and seminars to facilitate training and implementation of the DMT into design and construction
III. Example Hydrograph for bioretention cell at South Texas College
  • Storm event on 8 November 2016, 0.78 inch rainfall over 24 hours
IV. Methodology and Modeling
  • DMT will incorporate extensive LID runoff and pollutant reduction data collected over several years from LID implementation program led by TAMUK and LRGV SW TF supported by TCEQ NPS 319 Program
  • WinSLAMM model for SW BMP modeling peer reviewed and accepted by scientists, engineers and agencies
  • Model calibration and validation achievable for unique BMPs in the LRGV such as pervious pavements, bioswales, biodetention cells, others
Methodology and Modeling, continued.
  • Extensive modeling runs of various combinations and connection of BMPs to be developed
  • Outputs coalesced into user friendly approaches such as Excel spreadsheets and tables (DMT) for use by cities, counties, planners, and stakeholders
  • DMT training and workshops implemented and enhanced for additional BMPs and connections
   V. Milestones and Updates
  • Modeling QAP developed
  • Example prototypes for typical LRGV mixed use communities and development scenarios in development
  • Several initial meetings with DMT workgroup implemented
  • Modeling QAP developed
  • DMT WQ Conference roll out and engagement
  • Modeling scenarios and post processing completed October 2017
VI. Example development
  • Traditional detention basin
  • Olusola Fasae, TAMUK-ISEE
VII. Example development
  • Connections of pervious pavement and bio-detention cells
  • Olusola Fasae, TAMUK-ISEE
VIII. Example development
  • Connections of pervious pavement and bioswales
  • Olusola Fasae, TAMUK-ISEE

Acknowlegements

Border Environmental Cooperation Commission

U.S. EPA Border 2020 Contract SOLTA-15-010

Lower Rio Grande Valley -Storm Water Task Force Partners

University of Texas – Rio Grande Valley