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City of Sunset Valley

This final report outlines the assessment and recommendations for the City of Sunset Valley's drainage master plan. It analyzes existing drainage issues, including riverine overtopping and localized problems, identifies 52 drainage challenges, and proposes a 5-year service level mitigation goal. Key recommendations include regional drainage solutions, emergency access improvements, and potential buyouts for floodplain structures. The assessment emphasizes the importance of public acceptance, cost considerations, and continuous flood abatement programs to enhance community resilience against flooding.

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City of Sunset Valley

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  1. City of Sunset Valley Drainage Master Plan Assessment Final Recommendation Report March 24, 2009

  2. Project Goal • Assessment of master drainage plan • Development of alternative solutions • Develop final recommendations/report Prioritize Drainage Improvements

  3. Review Master Drainage Plan • Plan was comprehensive • Identified riverine overtopping of roadways and structural inundation in Old Sunset Valley • Identified 52 localized drainage issues • Identified a mitigation goal of 5-year level of service • Cost estimates did not include land acquisition or permitting

  4. Review New Drainage Concepts • Recharge features • Rooftop harvesting/other • Detention pond footprint • Upstream detention

  5. Drainage Mitigation Alternatives

  6. Regional Drainage Plan • Partnering with City of Austin and Travis County • Possible Improvements Include • Modifying West Gate Blvd • Regional Channelization • Regional detention • Regional natural waterway maintenance program

  7. Regional Drainage Plan • Advantages • Regional approach will achieve higher level of service • Regional solutions typically generate higher benefit cost ratio • Disadvantages • City/County participation unknown • Cost (unknown)

  8. Emergency Access Route

  9. Emergency Access Route • Advantages • Provides 100 year ingress/egress • Improves public health and safety • Multi use • Disadvantages • Will need to be maintained • Requires 11 easements • Cost $ 720,000

  10. Peak Flow Diversion

  11. Peak Flow Diversion • Advantages • Multi-use improvement • Provides 5 year ingress/egress • Removes 4 homes & 5 structures form 5 year floodplain • Reduces peak flow rates on other storm events • Disadvantages • Requires clearing of existing natural area • Not accepted by the public • Easement required (1) • Cost $1,600,000

  12. Low Water Crossing Improvements • Low water crossing improvements at • Loan Oak Trail • Pillow Road • Reese Drive (not included) • Sunset Trail (not included) • Channel Improvements not included • Improvements may be incorporated together or individually as funding becomes available

  13. Low Water Crossing Improvements • Advantages • Provides 5 year ingress/egress • Improves public health and safety • Disadvantages • Does not improve flooding impacts to homes or other structures • Drainage easements may be required on Pillow Road • Cost $1,110,000

  14. Buyout Option • Purchase homes within the floodplain • Median home price $300,000 • Cost for demolition and restoration $20,000/lot

  15. Buyout Option • 5 Year • Number of homes, 5 • Cost $1,280,000 • 100 Year • Number of homes, 30 • Cost $9,600,000

  16. Buyout Option • Advantages • Removes structures from the floodplain • Provides additional greenbelt areas • Provides land for site/regional detention • Disadvantages • Directly impacts several residents • Does not improve ingress/egress

  17. Drainage Programs • Reverse 911 • Natural Waterway Maintenance Program • Funding Options • Comprehensive Flood Abatement Program

  18. Final Recommendations • Evaluation criteria • Public acceptance 30% • Level of service 35% • Land Acquisition 20% • Cost 15% Total 100%

  19. Evaluation Matrix

  20. Final Recommendations • No. 1, Regional Drainage Plan -(if not feasible then proceed to No. 2) -Cost: Unknown • No. 2, Emergency Access Route 100-yr LOS Culvert Improvements 5-year LOS -Cost: $1,830,000 • No. 3 Emergency Access Route 100-year LOS Flow Diversion 5-year LOS -Cost: $2,370,000

  21. Final Recommendations Programs • Development a natural waterway maintenance program • If necessary for funding investigate the feasibility of creating a storm water utility • Continue the City’s comprehensive flood abatement program • Continue to adopt and enforce ordinances that meet or exceed FEMA requirements to reduce the risk of flooding. • Educate residents in high and moderate risk flood areas about flood insurance

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