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New Braunfels Stormwater Management Strategy New Braunfels, Texas Final Report January 2013

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New Braunfels Stormwater Management Strategy New Braunfels, Texas Final Report January 2013 New Braunfels Stormwater Management Strategy New Braunfels, Texas Final Report January 2013 Contents Abbreviations ............................v 'H¿QLWLRQV...............................v PHASE I REPORT..........................1 PHASE III REPORT ........................39 Staff Kick Off ............................2 Strategy Implementation Options Development..40 Key Findings ............................2 Round Two Stakeholder Meetings ...........41 Watershed Advisory Committee ..............3 Process ................................41 Project Site Tour..........................3 Results .................................41 Key Findings.............................3 Round Two Online Web Survey ..............42 Goals and Metrics ........................4 1. Flood Hazard Mitigation ..................44 Existing Conditions........................7 2. Open Space Conservation ................48 Existing Code and Planning Documents .......8 3. Stream and River Restoration.............52 Document Summaries .....................8 4. Floodway Building Prohibitions ............56 DCM Review ............................11 5. Litter Control...........................60 PHASE II REPORT .........................13 5HWUR¿W6WRUPZDWHU)DFLOLWLHV .............64 Stakeholder Meeting Process ...............14 7. Construction Control Measures ............68 Strategy Development .....................15 8. Building Runoff Capture ..................72 Strategy Details ..........................15 9. Maintenance and Monitoring ..............76 Round One Stakeholder Meetings ...........22 10. Impervious Coverage Reduction..........80 Process ................................22 11. Detention Basin.......................84 Results .................................22 12. City Tools ............................88 Legend .................................22 APPENDIX ...............................91 Round One Online Web Survey..............24 Appendix A - Existing Conditions Maps ........93 Priority Strategies.........................25 Appendix B - Strategy Cards ................127 Analysis Categories .......................26 Appendix C - Keypad Polling Results..........153 Priority Strategy Implementation Options.......29 Appendix D - Metroquest Results.............173 Floodway Building Prohibitions ..............30 Open Space Conservation ..................30 Flood Hazard Mitigation ...................31 Stream and River Restoration ...............32 Litter Control.............................33 Construction Control Measures ..............33 5HWUR¿W6WRUPZDWHU)DFLOLWLHV ................34 Building Runoff Capture ....................34 Impervious Coverage Reductions ............35 Maintenance and Monitoring ................36 Detention Basin ..........................37 Implementation Tools ......................37 | iii iv | New Braunfels Stormwater Management Strategy | New Braunfels, Texas Abbreviations CDBG . Community Development Block Grants CFM . .&HUWL¿HG)DFLOLW\0DQDJHU DCM . .Design Criteria Manual EARIP . .Edwards Aquifer Recovery Implementation Program ETJ . .Extra-territorial Jurisdiction FEMA . Federal Emergency Management Act FFE . .Finished Floor Elevation FMA . Flood Mitigation Assistance GBRA . Guadalupe-Blanco River Authority GEAA . .Greater Edwards Aquifer Alliance GESC . Grading, Erosion and Sediment Control Manual HMGP . Hazard Mitigation Grant Plan NBU . New Braunfels Utilities PDM . .Pre-Disaster Mitigation PFC . .Permeable Friction Course SRL . Severe Repetitive Loss TCEQ . Texas Commission on Environmental Quality TWDB . .Texas Water Development Board TxDOT . Texas Department of Transportation USACE . .United State Army Corps of Engineers USGBC . United States Green Building Council WORD . .Water-Oriented Recreation District 'H¿QLWLRQV City . the governing body of New Braunfels Developer . an individual or entity that is actively developing a property Landowner . an individual or entity who owns property | v I Phase I Report Phase I | 1 Project Kick Off Staff Kick Off mechanisms in place, even with 303d listing for e-coli and phosphorous. - Dry Comal | Testing indicates e-coli A staff kick off meeting was held on January levels should continue to be monitored 12, 2011. Representatives from Design and Best Management Practices Workshop, LAN and the City attended. (BMP’s) developed to maintain &LW\RI¿FLDOVSUHVHQWLQFOXGHGWKH&LW\ levels below appropriate recreation Manager and representatives from Planning, standards. Engineering, Building, Public Works and - Comal | Springs, lakes , mill race and River Activities departments. river have endangered species issues and river recreation issues. The agenda covered - Old Channel of the Comal | Tourism 1. Vision and Critical Success Factors relies on this waterway and water quality is critical for tourism and 2. Study Area Boundary endangered species. - Blieders Creek | This watershed 3. Project Management Plan outfalls at Landa Lake. There is a large development working through 4. Final Deliverables the City that would greatly impact this watershed, which is already suffering 5. Metrics from erosion and sedimentation. - Guadalupe | There is various 6. Immediate Policy Changes infrastructure that relies on this watershed, including surface water 7. Public Engagement Plan plant and recreation. 8. Watershed by Watershed Issues 4. The immediate policy changes include establishing drainage improvement plans that are bonded by a developer for two years and construction of drainage Key Findings LPSURYHPHQWVVXI¿FLHQWWRPLWLJDWH development as it occurs. .H\¿QGLQJVWKDWFDPHRXWRIWKH6WDII.LFN Off included: 5. In May 2011, City Council increased mitigation through detention, retention 1. Vision is for a state of the art stormwater or some other technique that must be management plan that is practical, designed, constructed and maintained economical and forward thinking. to reduce the post-development discharge to below that of pre- 2. Stormwater planning goes beyond development for the 2-year, 10-year, city limits and is driven by watershed 25-year and 100-year design storms. boundaries. Strategies need to work for Participation in neighborhood or this geographic range. regional mitigation is an acceptable option. The stormwater master plan 3. 6SHFL¿FZDWHUVKHGVZLWKFRQFHUQV should support this. include: 6. Public engagement needs to include key - Alligator and Geronimo Creek | stakeholders who have water rights on There are many approved but unbuilt the rivers, like Schlitterbahn, as well as subdivisions with no water quality the general public. 2 | Phase I New Braunfels Stormwater Management Strategy | New Braunfels, Texas Project Site Tour 7. The Watershed Advisory Committee, including discussions on e-coli levels and or steering committee, needs to be the creek assessment completed by LAN made up of a diverse group of people and Design Workshop in the spring of and will play a critical role in the review 2010. of the Stormwater Management Plan, Drainage Criteria Manual and the 7KHVH¿YHUHYLHZVRIIHUHGWKH:$&DQ Federally Mandated Municipal Separate RSSRUWXQLW\WRVHH¿UVWKDQGDYDULHW\RI Storm Sewer (FM MS4) Permit process. stormwater issues and opportunities that They may or may not be a long term play a role in the economic, environment, watershed advisory group. community and aesthetic value in New Braunfels. Watershed Advisory Committee Key Findings The selection of the Watershed Advisory Committee (WAC) began in February 2011 During the tour, it was observed that and continued through June 2011. The stormwater management has to be schedule and progress of the plan was consistently analyzed at a macro and micro adjusted to accommodate the appointment VFDOHIURPUHJLRQDOWRVLWHVSHFL¿FVROXWLRQV of the WAC. Also observed was the need to understand issues associated with stormwater quality Project Site Tour and stormwater quantity as it relates to New Braunfels, since the natural beauty SOD\VVXFKDVLJQL¿FDQWUROHQRWRQO\LQWKH On July 12th, 2011, the WAC, City of recreational tourism, but also the health and New Braunfels, Design Workshop and safety of the community. LAN participated in a site tour looking at stormwater issues and opportunities around the City. The site tour included the following: Review of green infrastructure management practices using native lowland prairie, wetland benches and wet ponds as a form of water quality and water quantity needs for a retail project. Review of traditional stormwater management practices of water quality and water detention ponds in a residential development currently under construction. Review of New Braunfels Utilities site conditions and adjacent runoff near one of the Comal Springs with endangered species. Review of Landa Park, associated springs, Panther Canyon and human impact to water edge conditions including discussions of the impact to Landa Park after the June 2010 storm event. Review of the Dry Comal and adjacent development impact to water quality Phase I | 3 Project Goals and Metrics Goals and Metrics Goals for the Stormwater Management achieve this harmony are enduring places Plan are in line with DW Legacy Design® that make a difference in society, the well methodology that creates special places that being of the planet and leave a legacy for meet today’s needs, and are sustainable future generations. environments for all time. This process seeks to imbue every project with the Each goal has one or multiple metrics perfect balance between environmental that are used to measure progress toward sensitivity, community connections, artistic the goal.
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