of stormflows captured in ponds. Flood control structures, detention ponds and impervious cover are shown at the sub-basin scale below in Figures 2-5. Figure 2. Sink Creek watershed detention ponds and flood control structures (City of San Marcos Land Cover Data, 2013) Figure 3. Sessom Creek watershed detention ponds and flood control structures (City of San Marcos Land Cover Data, 2013) Figure 4. Purgatory Creek watershed detention ponds and flood control structures (City of San Marcos Land Cover/Capital Improvements Data, 2013) Figure 5. Willow Springs Creek watershed detention ponds and flood control structures (City of San Marcos Land Cover Data, 2013) Existing City of San Marcos Management Practices Table 2 provides list of structural BMPs that the City of San Marcos has implemented and continues to maintain. Table 2. Existing City of San Marcos structural management practices (as of 2015) ID # Type Location Material Year Installed 63 Detention Pond Westover Improvements Earthen Unknown 78 Detention Pond Ridge Part 2 Earthen Unknown 113 Detention Pond Holland & N LBJ Other Unknown 148 Detention Pond Sunset Earthen Unknown 151 Detention Pond of Hays Earthen Unknown 15 Detention Pond Fire Station Hunter Rd Earthen Unknown 33 Detention Pond Senior Center Earthen Unknown 39 Detention Pond Hummingbird Earthen Unknown 175 Detention Pond Craddock Earthen 2006 143 Detention Pond 2001 N. Bishop Earthen Unknown 27 Detention Pond Willow Springs Park Earthen 2001 122 Detention Pond Airport Unknown Unknown 146 Detention Pond Post Rd Earthen/Sand Filter 2008
99 Detention Pond Gary Sports Complex Unknown 2013 1281 Detention Pond Rattler Road Earthen 2014 117 Detention Pond Gary Sports Complex Unknown 2013 126 Detention Pond San Marcos High School Band Pad Earthen 2003 165 Detention Pond San Marcos CISD Dezavala Elem Addition Earthen 2005 169 Detention Pond San Marcos CISD High School Earthen 2005 173 Detention Pond San Marcos CISD High School Earthen 2005 WQD1 Stormwater System AQUARENA SPRINGS DR/UNIVERSITY DR Vortech Unknown WQD6 Stormwater System AQUARENA SPRINGS DR/UNIVERSITY DR Vortech Unknown WQD8 Stormwater System AQUARENA SPRINGS DR/UNIVERSITY DR Vortech Unknown WQD5 Stormwater System AQUARENA SPRINGS DR/UNIVERSITY DR Vortech Unknown WQD10 Stormwater System AQUARENA SPRINGS DR/UNIVERSITY DR Vortech Unknown Stormwater System AQUARENA SPRINGS DR/UNIVERSITY DR Vortech Unknown WQD4 Stormwater System RIVER RD/AQUARENA SPRINGS DR Stormcepter Unknown WQD2 Stormwater System W SAN ANTONIO ST/FREDERICKSBURG ST VortSentry Unknown WQD3 Stormwater System LN/RIVER RD Stormcepter Unknown WQD9 Stormwater System CLYDE ST/ALLEN ST Stormcepter Unknown WQD7 Stormwater System DELMAR ST/ALLEN ST Stormcepter Unknown N/A Weir System Unknown Unknown Unknown N/A Roadside Network Unknown Earthen Unknown N/A Above Ground Cisterns New Fire Stations Unknown Unknown N/A Biofiltration CM Allen Parkway at Hutchison Earthen 2015 N/A Disconnected Impervious Cover Hutchison St. Earthen 2015 N/A Rain Gardens Hunter Road Earthen 2015
Table 5. Existing non-structural management practices Management Practice Texas State University City of San Marcos Hays County Private Subdivision and Development Regulations X X Storm Water Plan for NPDES Permit/MS4 SWMP (TCEQ Permit #TXR040485) X X X X Public Education and Outreach X X X Stormwater, Construction and other water quality protection Best Practices and Technical Manuals X X X Integrated Pest Management and Fertilizer Use X X Recycling and compost programs X X Water Efficient Landscaping X X X X Golf Course Management X Regulation of Industrial Activities X X X X
Waste Reduction, Recycling, and Disposal X X X Control and Response X X X Coal Tar Sealant Ban X Incentives Programs: Reuse and Efficiency X Restoration and management of natural areas and parkland for water quality protection X X X Watershed Restoration, Rehabilitation and Maintenance (as per HCP) X X X Inspection and Rehabilitation of On-Site Wastewater Treatment Systems X Detecting and Eliminating of Illicit Connections to Stormwater System X Prevention of Illegal Dumping X X X OSSF Rules X X
CHAPTER 725 - STORM WATER STANDARDS Contents of Chapter 725 Sub - Chapter 1 – Applicability: §1.01. Applicability §1.02. Legal Authority §1.03. Approval Required Sub - Chapter 2 - Public Facilities: §2.01. Dedication to Public §2.02. Publicly Maintained and Dedicated Facilities §2.03. Construction of Public Storm Water Management Facilities Sub – Chapter 3 - Design Criteria: §3.01. Design of Storm Water Management Facilities §3.02. Control of Runoff Rate and Volume §3.03. Sizing of Water Management Facilities §3.04. Conveyance of 100 - Year Frequency Flows §3.05. Maximum Headwater Elevation for Roadway Crossings §3.06. Public Safety Considerations §3.07. Identification of Special Hazard Areas §3.08. Completion of Drainage System Prior to Acceptance of Road way Maintenance Sub – Chapter 4 – Areas Subject to Local Water Quality Requirements: §4.01. Compliance Required Developments §4.02. Incorporation by Reference §4.03. Notice of the Water Quality Requirements of Other Jurisdictions Source: CHAPTER 735 - FLOOD DAMAGE PREVENTION Contents of Chapter 735 Sub - Chapter 1 – Applicability: §1.01. General Requirements §1.02. Legal Authority §1.03. Findings of Fact §1.04. Statement of Purpose §1.05. Approval Required Prior to Development §1.06. Methods of Reducing Flood Losses Sub - Chapter 2 - Definitions Specific to This Chapter: Sub - Chapter 3 - General Provisions: §3.01. Lands to Which This Chapter Applies §3.02. Basis for Establishing the Areas of Special Flood Hazard §3.03. Establishment of Development Permit System §3.04. Compliance, §3.05. Abrogation and Greater Restrictions §3.06. Interpretation §3.07. Warning and Disclaimer of Liability §3.08. Establishment of Fees Sub - Chapter 4 – Administration: §4.01. Designation of the Floodplain Administrator §4.02. Duties and Responsibilities of the Floodplain Administrator §4.03. Classification of Flood Hazard Area Permits §4.04. Permit Procedures §4.05. Expiration of Flood Hazard Area Permits §4.06. Variance Procedures