PEOPLE, THE ENVIRONMENT & GIS SUSTAINING SAN ANTONIO’S REGIONAL CENTERS

Sara Mendiola, San Antonio River Authority

Transcript

1. PEOPLE, THE ENVIRONMENT & GIS SUSTAINING SAN ANTONIO’S REGIONAL CENTERS San Antonio River Authority
2. Growth of San Antonio, Texas Birth of the Impervious Cover Mitigation Project Brooks Regional Center: Project Analysis Results & Policy Recommendation Texas A&M University at San Antonio Outreach & Stakeholder Engagement
3. Growth of San Antonio, Texas National Land Cover Database for 2011 and 2050. Red represents developed and urban areas. Increased population = Increased development The greater San Antonio Metropolitan area population is projected to grow by over 1 million residents by 2040. 2011 2050
4. How Do We Plan for Growth? SA Tomorrow Plan Comprehensive Plan Sustainability Plan Multimodal Transportation Plan 13 Regional Centers
5. Birth of Impervious Cover Mitigation Project Adverse Impacts of Impervious cover:  Increased flooding for streams and at street level.  Degradation in water quality and stream health.  Increased stormwater runoff and cost for stormwater infrastructure. Brooks Regional Center
6. https://www.usgs.gov/media/images/urban-stormwater-monitoring-stormwater-runoff-flow
7. Brooks Regional Center Impervious Cover Data
8. Mitigation Strategies  Stormwater Parks  Green Complete Streets  Parking Reduction  Low Impact Development (LID)  Conservation Development  100-year Floodplain Preservation Green Complete Streets: streets that remain accessible to people walking and biking during storm events due to the implementation of stormwater control and management. Low Impact Development: LID is a sustainable land planning and engineering design approach to managing stormwater runoff as close as possible to the source.
9. Scenario 1: Existing Development Utilizes current land use updated based on aerial imagery.
10. Scenario 2: Traditional Development • Utilizes future land use updated based on aerial imagery. • Evaluated for river-level and street-level flood impacts.
11. Scenario 3: Recommended Development • Utilizes future land use with mitigated strategies addressing stormwater and flood control. • LID supplements traditional stormwater infrastructure.
12. Brooks Regional Center: Project Analysis ▪ Acquired ICM data and visualized 3 development scenarios. ▪ Project Modeling Efforts – Hydrologic and Hydraulics (H&H) for flood risk – Hydrological Simulation Program – FORTRAN (HSPF) for Water Quality – Trash – Triple Bottom Line (TBL)
13. Modeling Results Recommended Traditional Peak Flow Runoff 2-year storm 6% 25% 100-year storm 3% 10% Stream Flow Velocities Max increase 2% 14% Average Increase 0.90% 5% Trash in Brooks 64 Gallon bins 437 633 Area A Impervious Cover 24% 32% E. Coli load 14% 44% Area B Impervious Cover 60% 63% E. Coli load 23% 56% Heat mortality is associated with increased impervious cover and is 2x greater in the traditional scenario.
14. Investing in the Future The Recommended scenario provided over $60 million in social an environmental benefits associated with flood risk, heat mortality, and water quality while reducing grey infrastructure costs.
15. Success! ▪ Brooks Development Authority (BDA) is seeking to incorporate LID and to serve as a model of higher quality development, in part through LID, for the rest of the City. ▪ BDA has applied for a Great Urban Park grant to enhance an existing park by incorporating a stormwater park. ▪ Brooks submitted numerous applications on different projects incorporating LID for SARA’s 2018/19 LID rebate funding.
16. Texas A&M University at San Antonio Regional Center Urban Ecoplan GIS simplifies land use planning efforts by integrating various spatial datasets. Creating a Natural Systems Inventory: Water Vegetation Tree Density Soils Grey Infrastructure Terrain/Slope Project Area: 7,240 acres total 2,000 acres undeveloped
17. Growth of Texas A&M University at San Antonio TAMU-SA 2017 Master Plans: ▪ Increased enrollment of 5,500 students to 12,500 students over the next several years. ▪ a complete build-out of campus to accommodate more than 50,000 students. ▪ Increased academic and administrative facilities, on-campus student housing, recreation and student-life function and identifying critical infrastructure projects and parking needs.
18. Outreach and Engagement Communicating with Storymaps: ▪ Visualizing change ▪ Identifying patterns ▪ Proposing new ideas/policy ▪ Interactive features
19. SARA MENDIOLA SAN ANTONIO RIVER AUTHORITY SMENDIOLA@SARA-TX.ORG 210-302-3299