Texas Floodplain Management Association
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2021 Annual Meeting Abstracts Many thanks to the Zone X Sponsors TUESDAY – APRIL 13, 2021 7:30 am – Virtual Room opens 8:00 am – 8:30 am PLENARY SESSION Speaker: The Honorable Charles Perry Texas State Senator, District 28 Presentation: Update from the State Legislature 8:45 am – 9:40 am Speakers: Tyler Payne, PMP; Colleen Jones Texas General Land Office Presentation: Regional Flood Studies and Interagency Grants The Texas General Land Office Community Development and Revitalization (GLO-CDR) Planning team designs and oversees planning studies to collect, analyze, and communicate disaster-related data to assist decision makers to better protect Texans from future disasters. GLO-CDR recently implemented the Combined River Basin Flood Studies, detailing flood risk information and mitigation strategies for disaster-impacted counties impacted by Hurricane Harvey. Additional funding is being directed toward interagency grants with the Texas Water Development Board (TWDB), US Army Corps of Engineers (USACE), and US Geological Survey (USGS) for the creation of a team of industry experts to assess and develop potential flood models that will build a comprehensive framework for evaluating flood risks. Finally, through an additional interagency grant, Texas University A&M Systems (TAMUS) is developing a system capable of housing, securing, and displaying the state’s disaster data needs. Learn how these interrelated initiatives will help inform communities to mitigate against future disasters. 1 of 25 9:55 am – 10:50 am Speakers: Saul Nuccitelli, PE, CFM; Reem Zoun, PE, CFM Texas Water Development Board Presentation: TWDB Flood Rish Reduction Effort Update The 86th Texas Legislature passed, and Governor Abbott signed, Senate Bill 500 which appropriated $47,000,000 from the floodplain management account in the Texas infrastructure resiliency fund to the TWDB for developing or updating flood risk maps in the state to support development of a state flood plan. This presentation will cover the upcoming mapping initiatives, regional flood planning and state flood planning activities by the Texas Water Development Board. 10:50 am – 11:00 am BREAK 11:15 am – 12:15 pm General Membership Meeting Presenters: John Espinoza, PE, CFM – TFMA President Stephanie Griffin, PE, CFM – TFMA Treasurer Wes Birdwell, PE, CFM – TFMA Executive Director 12:15 pm – 12:45 pm – REMO Networking 1:00 pm – 4:30 pm CONCURRENT SESSIONS TRACK A – DRAINAGE/STORMWATER MANAGEMENT 1:00 pm – 1:30 pm A1 Ranking of Potential Sites for Stormwater Best Management Practices Speakers: Yu-Chun Su, Ph.D., P.E., CFM, CPESC, CPSWQ; Lockwood, Andrews & Newnam, Inc. Michelle Garza; San Antonio River Authority Ka Leung Lee, PhD., PE, CFM, CPSWQ; Lockwood, Andrews & Newnam, Inc. Presentation: A stormwater Best Management Practice (BMP) performance evaluation HSPF modeling project was conducted under the Upper San Antonio River (USAR) Watershed Protection Plan Implementation (WPPI) – Green Stormwater Infrastructure (GSI) Master Plan Data Acquisition, Modeling, and Geospatial Quality Assurance Project Plan. This effort was funded in part by the United States Environmental Protection Agency federal Clean Water Act 319(h) funds through the Texas Commission on Environmental Quality (TCEQ) and the San Antonio River Authority (SARA). BMP evaluation and associated HSPF modeling effort was conducted by Lockwood, Andrews & Newnam, Inc. (LAN). To assist with the selection of BMP sites that are most suitable for modeling and performance evaluation, a BMP ranking matrix was developed using MS Excel. This ranking matrix is the first of its kind in San Antonio and it greatly helped with evaluation and selection of BMP sites within a water quality modeling subbasin. The developed BMP ranking matrix involves assigning scores to key factors such as drainage area, land uses, BMP footprint area, receiving water, BMP types, shading, floodplain, soil types, etc. The ranking matrix is set up so each of the scores in the matrix is multiplied by a weighing factor when calculating the “Overall_Score”. The weighing factors are located in the “Weights” row with default values of 1.0, and SARA and other potential users can adjust the values higher or lower as they see fit. The results of the BMP ranking analysis were used to support BMP performance evaluation modeling for estimating annual average load removal at each BMP site and the effectiveness of BMP in reducing constituent loads. The target constituents are E. coli and nutrients. This presentation will cover the development, application, and findings of the BMP ranking matrix. 2 of 25 1:00 pm – 4:30 pm CONCURRENT SESSIONS TRACK A – DRAINAGE/STORMWATER MANAGEMENT 1:45 pm – 2:15 pm A2 – Smart LOF Analysis – Using the Past to Guide the Future Speakers: Matt Stahl, P.E., CFM; Halff Associates Cooper Hoffman, EIT, CFM; Halff Associates Cannon R. Henry, P.E., CFM; City of Fort Worth Presentation: This presentation will discuss the ‘Smart LOF’ (Smart Likelihood of Failure) analysis and how we envision it adding value and lowering the cost of storm drain rehabilitation and asset management. Smart LOF analysis allows cities to harness immense amounts of condition assessment data with asset-level granularity through a process that guides decision-making to prioritize revitalization and rehabilitation of aging infrastructure. The City of Fort Worth is entering its second operational year of a comprehensive Storm Drain Rehabilitation Program (SDRP) that is managed by the Transportation and Public Works Department, Stormwater Management Division. During Year 1 (FY20), 18+ miles of storm drain were CCTV inspected, imported to GIS, and evaluated for corrective actions. The City’s goal is to inspect and evaluate 25+ miles of storm drain in Year 2 (FY21) and beyond. Halff Associates assisted the City of Fort Worth with the SDRP Program development and implementation from FY19 to FY21. After the first full year of the program, Halff identified an opportunity for the City to harness the GIS, Risk, and CCTV datasets generated by the SDRP Program to better understand the critical and complex problems related to storm drain operations, maintenance, and repair. Halff independently developed and carried out a machine learning analysis that the City may implement in the future to better inform decisions and spending on condition assessment and capital projects. This type of analysis can be used to effectively model likelihood of failure for utility datasets that meet specific criteria. A supervised machine learning approach enabled us to leverage a relatively small subset of field data (~5% of system) to approximate condition for the rest of the system with a True Positive hit rate of 70-80%. The approach can also pinpoint trends and patterns that aren’t readily apparent through traditional summary statistics and observations. 2:30 pm – 3:00 pm A3: Salado Creek Watershed – Hydrologic Updates and Karst Interactions in the San Antonio River Basin Speakers: Rebecca Katz, PE, PMP, CFM, ENV SP; Atkins Lukas Godbout, EIT; Atkins Presentation: The San Antonio River Authority (SARA) is performing floodplain mapping updates for the major watersheds in Bexar County. The updates include new hydrologic modeling standards which will be incorporated in a future update of the San Antonio River Basin Regional Modeling Standards for Hydrology and Hydraulic Modeling. Major hydrologic modeling changes include revisions to loss methods from SCS Curve Number method to Green and Ampt to better account for karst terrain within the river basin. Atkins was contracted to perform mapping and modeling updates for the Salado Creek watershed. A large portion of the 223 square mile watershed is located within the Edwards Aquifer. Subsurface interactions through karst terrain and artesian areas have significant impacts on the riverine hydrology but were not accounted for in the effective 2010 hydrologic models. Review of historical gage data along the Salado Creek mainstem indicate that recorded peak flows include high variability with up to 75% downstream peak flow reduction over 13 river miles for the May 2013 storm event. This presentation will discuss the hydrologic modeling and calibration efforts in the watershed. Topics will also include calibration challenges encountered due to limited historical gage data, rapid urbanization, and aquifer interactions to surface flow. Additional topics include: • Major changes to SARA hydrologic modeling methodology • NOAA Atlas 14 update • Karst aquifer considerations • Draft Salado peak flow information 3 of 25 1:00 pm – 4:30 pm CONCURRENT SESSIONS TRACK A – DRAINAGE/STORMWATER MANAGEMENT 3:15 pm – 3:45 pm A4: Master Planning & Detention in Established Neighborhoods – The University Park Experience Speakers: Katie Barron, PE, ENV SP; City of University Park Hamilton Dallagasperina, PE, CFM; Huitt-Zollars Gabriela Bell, PE, CFM; Huitt-Zollars Presentation: Reducing flood risk in older, established neighborhoods that were designed to less stringent criteria than is common today can be challenging. Developing a clear understanding of the existing conditions is key. Out-side-the-box thinking can also be critical to developing cost-effective solutions. We will examine master-planning efforts, discuss underground detention design, and display time-lapsed construction videos. We will also discuss project management and project delivery alternatives from the City Engineer perspective. 4:00 pm – 4:30 pm A5: Pecan Creek Watershed Study: Practical Solutions to Urban Flooding in